diff --git a/adb/client/bugreport.cpp b/adb/client/bugreport.cpp
index f2e722a..b765a30 100644
--- a/adb/client/bugreport.cpp
+++ b/adb/client/bugreport.cpp
@@ -224,7 +224,8 @@
         // 'bugreport' would generate a lot of output the user might not be prepared to handle).
         fprintf(stderr,
                 "Failed to get bugreportz version: 'bugreportz -v' returned '%s' (code %d).\n"
-                "If the device does not run Android 7.0 or above, try 'adb bugreport' instead.\n",
+                "If the device does not run Android 7.0 or above, try this instead:\n"
+                "\tadb bugreport > bugreport.txt\n",
                 bugz_output.c_str(), status);
         return status != 0 ? status : -1;
     }
diff --git a/fs_mgr/libdm/Android.bp b/fs_mgr/libdm/Android.bp
index e425284..a0bc44d 100644
--- a/fs_mgr/libdm/Android.bp
+++ b/fs_mgr/libdm/Android.bp
@@ -99,7 +99,3 @@
         "liblog",
     ],
 }
-
-vts_config {
-    name: "VtsKernelLibdmTest",
-}
diff --git a/fs_mgr/libdm/AndroidTest.xml b/fs_mgr/libdm/AndroidTest.xml
deleted file mode 100644
index b4e0c23..0000000
--- a/fs_mgr/libdm/AndroidTest.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2019 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<configuration description="Config for VTS VtsKernelLibdmTest">
-    <option name="config-descriptor:metadata" key="plan" value="vts-kernel" />
-    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.VtsFilePusher">
-        <option name="abort-on-push-failure" value="false"/>
-        <option name="push-group" value="HostDrivenTest.push"/>
-    </target_preparer>
-    <test class="com.android.tradefed.testtype.VtsMultiDeviceTest">
-      <option name="test-module-name" value="VtsKernelLibdmTest"/>
-        <option name="binary-test-source" value="_32bit::DATA/nativetest/libdm_test/libdm_test" />
-        <option name="binary-test-source" value="_64bit::DATA/nativetest64/libdm_test/libdm_test" />
-        <option name="binary-test-type" value="gtest"/>
-        <option name="test-timeout" value="1m"/>
-        <option name="precondition-first-api-level" value="29" />
-    </test>
-</configuration>
-
diff --git a/fs_mgr/liblp/Android.bp b/fs_mgr/liblp/Android.bp
index a779a78..9517bd3 100644
--- a/fs_mgr/liblp/Android.bp
+++ b/fs_mgr/liblp/Android.bp
@@ -107,7 +107,3 @@
     name: "vts_kernel_liblp_test",
     defaults: ["liblp_test_defaults"],
 }
-
-vts_config {
-    name: "VtsKernelLiblpTest",
-}
diff --git a/fs_mgr/liblp/AndroidTest.xml b/fs_mgr/liblp/AndroidTest.xml
deleted file mode 100644
index 2eb0ad1..0000000
--- a/fs_mgr/liblp/AndroidTest.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2019 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<configuration description="Config for VTS VtsKernelLiblpTest">
-    <option name="config-descriptor:metadata" key="plan" value="vts-kernel" />
-    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.VtsFilePusher">
-        <option name="abort-on-push-failure" value="false"/>
-        <option name="push-group" value="HostDrivenTest.push"/>
-    </target_preparer>
-    <test class="com.android.tradefed.testtype.VtsMultiDeviceTest">
-      <option name="test-module-name" value="VtsKernelLiblpTest"/>
-        <option name="binary-test-source" value="_32bit::DATA/nativetest/vts_kernel_liblp_test/vts_kernel_liblp_test" />
-        <option name="binary-test-source" value="_64bit::DATA/nativetest64/vts_kernel_liblp_test/vts_kernel_liblp_test" />
-        <option name="binary-test-type" value="gtest"/>
-        <option name="test-timeout" value="1m"/>
-        <option name="precondition-first-api-level" value="29" />
-    </test>
-</configuration>
-
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index db2e16c..6e81c8b 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -267,12 +267,6 @@
     defaults: ["libsnapshot_test_defaults"],
 }
 
-// For VTS 10
-vts_config {
-    name: "VtsLibsnapshotTest",
-    test_config: "VtsLibsnapshotTest.xml"
-}
-
 cc_binary {
     name: "snapshotctl",
     srcs: [
diff --git a/fs_mgr/libsnapshot/VtsLibsnapshotTest.xml b/fs_mgr/libsnapshot/VtsLibsnapshotTest.xml
deleted file mode 100644
index b53b51e..0000000
--- a/fs_mgr/libsnapshot/VtsLibsnapshotTest.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2020 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<configuration description="Config for VTS VtsLibsnapshotTest">
-    <option name="config-descriptor:metadata" key="plan" value="vts-kernel"/>
-    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.VtsFilePusher">
-        <option name="abort-on-push-failure" value="false"/>
-        <option name="push-group" value="HostDrivenTest.push"/>
-    </target_preparer>
-    <test class="com.android.tradefed.testtype.VtsMultiDeviceTest">
-        <option name="test-module-name" value="VtsLibsnapshotTest"/>
-        <option name="binary-test-source" value="_32bit::DATA/nativetest/vts_libsnapshot_test/vts_libsnapshot_test"/>
-        <option name="binary-test-source" value="_64bit::DATA/nativetest64/vts_libsnapshot_test/vts_libsnapshot_test"/>
-        <option name="binary-test-type" value="gtest"/>
-        <option name="test-timeout" value="5m"/>
-    </test>
-</configuration>
diff --git a/fs_mgr/tests/Android.bp b/fs_mgr/tests/Android.bp
index f68ab87..9ed283a 100644
--- a/fs_mgr/tests/Android.bp
+++ b/fs_mgr/tests/Android.bp
@@ -17,7 +17,6 @@
     test_suites: [
         "cts",
         "device-tests",
-        "vts10",
     ],
     compile_multilib: "both",
     multilib: {
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index d56f7f2..e995888 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -740,7 +740,7 @@
   grep -v \
     -e "^\(overlay\|tmpfs\|none\|sysfs\|proc\|selinuxfs\|debugfs\|bpf\) " \
     -e "^\(binfmt_misc\|cg2_bpf\|pstore\|tracefs\|adb\|mtp\|ptp\|devpts\) " \
-    -e "^\(ramdumpfs\) " \
+    -e "^\(ramdumpfs\|binder\|/sys/kernel/debug\) " \
     -e " functionfs " \
     -e "^\(/data/media\|/dev/block/loop[0-9]*\) " \
     -e "^rootfs / rootfs rw," \
@@ -755,7 +755,7 @@
 uninteresting to the test" ]
 skip_unrelated_mounts() {
     grep -v "^overlay.* /\(apex\|bionic\|system\|vendor\)/[^ ]" |
-      grep -v "[%] /\(apex\|bionic\|system\|vendor\)/[^ ][^ ]*$"
+      grep -v "[%] /\(data_mirror\|apex\|bionic\|system\|vendor\)/[^ ][^ ]*$"
 }
 
 ##
@@ -1301,9 +1301,9 @@
 fi
 check_ne "${BASE_SYSTEM_DEVT}" "${BASE_VENDOR_DEVT}" --warning system/vendor devt
 [ -n "${SYSTEM_DEVT%[0-9a-fA-F][0-9a-fA-F]}" ] ||
-  die "system devt ${SYSTEM_DEVT} is major 0"
+  echo "${YELLOW}[  WARNING ]${NORMAL} system devt ${SYSTEM_DEVT} major 0" >&2
 [ -n "${VENDOR_DEVT%[0-9a-fA-F][0-9a-fA-F]}" ] ||
-  die "vendor devt ${SYSTEM_DEVT} is major 0"
+  echo "${YELLOW}[  WARNING ]${NORMAL} vendor devt ${VENDOR_DEVT} major 0" >&2
 
 # Download libc.so, append some gargage, push back, and check if the file
 # is updated.
diff --git a/init/Android.bp b/init/Android.bp
index 3f2cd07..13b1876 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -273,7 +273,6 @@
     test_suites: [
         "cts",
         "device-tests",
-        "vts10",
     ],
 }
 
diff --git a/liblog/include_vndk/log/log.h b/liblog/include_vndk/log/log.h
index ab4adc4..fee18c6 100644
--- a/liblog/include_vndk/log/log.h
+++ b/liblog/include_vndk/log/log.h
@@ -1,10 +1,11 @@
 /*Special log.h file for VNDK linking modules*/
 
-#ifndef _LIBS_LOG_LOG_H
-#define _LIBS_LOG_LOG_H
+#pragma once
 
-/* Historically vendors have depended on this header being included. */
+/* Historically vendors have depended on these headers being included. */
 #include <fcntl.h>
+#include <pthread.h>
+#include <unistd.h>
 
 #include <android/log.h>
 #include <log/log_id.h>
@@ -24,5 +25,3 @@
 #ifndef LOG_TAG
 #define LOG_TAG NULL
 #endif
-
-#endif /*_LIBS_LOG_LOG_H*/
diff --git a/liblog/tests/Android.bp b/liblog/tests/Android.bp
index a17d90c..171aafd 100644
--- a/liblog/tests/Android.bp
+++ b/liblog/tests/Android.bp
@@ -98,7 +98,6 @@
     test_suites: [
         "cts",
         "device-tests",
-        "vts10",
     ],
 }
 
diff --git a/libprocessgroup/profiles/Android.bp b/libprocessgroup/profiles/Android.bp
index ccc6f62..c371ef7 100644
--- a/libprocessgroup/profiles/Android.bp
+++ b/libprocessgroup/profiles/Android.bp
@@ -104,8 +104,3 @@
         "vts",
     ],
 }
-
-vts_config {
-    name: "VtsProcessgroupValidateTest",
-    test_config: "vts_processgroup_validate_test.xml",
-}
diff --git a/libprocessgroup/profiles/vts_processgroup_validate_test.xml b/libprocessgroup/profiles/vts_processgroup_validate_test.xml
deleted file mode 100644
index 21d29cd..0000000
--- a/libprocessgroup/profiles/vts_processgroup_validate_test.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2019 The Android Open Source Project
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-          http://www.apache.org/licenses/LICENSE-2.0
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<configuration description="Config for VtsProcessgroupValidateTest">
-    <option name="config-descriptor:metadata" key="plan" value="vts-treble" />
-    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.VtsFilePusher">
-        <option name="abort-on-push-failure" value="false"/>
-        <option name="push-group" value="HostDrivenTest.push"/>
-    </target_preparer>
-    <test class="com.android.tradefed.testtype.VtsMultiDeviceTest">
-        <option name="test-module-name" value="VtsProcessgroupValidateTest"/>
-        <option name="binary-test-working-directory" value="_32bit::/data/nativetest/" />
-        <option name="binary-test-working-directory" value="_64bit::/data/nativetest64/" />
-        <option name="binary-test-source" value="_32bit::DATA/nativetest/vts_processgroup_validate_test/vts_processgroup_validate_test" />
-        <option name="binary-test-source" value="_64bit::DATA/nativetest64/vts_processgroup_validate_test/vts_processgroup_validate_test" />
-        <option name="binary-test-type" value="gtest"/>
-        <option name="binary-test-disable-framework" value="false"/>
-        <option name="test-timeout" value="30s"/>
-    </test>
-</configuration>
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index 75a419c..7770b13 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -296,6 +296,8 @@
         "tests/files/offline/shared_lib_in_apk_memory_only_arm64/*",
         "tests/files/offline/shared_lib_in_apk_single_map_arm64/*",
         "tests/files/offline/signal_load_bias_arm/*",
+        "tests/files/offline/signal_fde_x86/*",
+        "tests/files/offline/signal_fde_x86_64/*",
         "tests/files/offline/straddle_arm/*",
         "tests/files/offline/straddle_arm64/*",
     ],
diff --git a/libunwindstack/DwarfSection.cpp b/libunwindstack/DwarfSection.cpp
index bf86e6e..ad25e80 100644
--- a/libunwindstack/DwarfSection.cpp
+++ b/libunwindstack/DwarfSection.cpp
@@ -37,7 +37,8 @@
 
 DwarfSection::DwarfSection(Memory* memory) : memory_(memory) {}
 
-bool DwarfSection::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished) {
+bool DwarfSection::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished,
+                        bool* is_signal_frame) {
   // Lookup the pc in the cache.
   auto it = loc_regs_.upper_bound(pc);
   if (it == loc_regs_.end() || pc < it->second.pc_start) {
@@ -59,6 +60,8 @@
     it = loc_regs_.emplace(loc_regs.pc_end, std::move(loc_regs)).first;
   }
 
+  *is_signal_frame = it->second.cie->is_signal_frame;
+
   // Now eval the actual registers.
   return Eval(it->second.cie, process_memory, it->second, regs, finished);
 }
@@ -241,6 +244,9 @@
           return false;
         }
         break;
+      case 'S':
+        cie->is_signal_frame = true;
+        break;
     }
   }
   return true;
@@ -558,8 +564,10 @@
     cur_regs->set_pc((*cur_regs)[cie->return_address_register]);
   }
 
-  // If the pc was set to zero, consider this the final frame.
-  *finished = (cur_regs->pc() == 0) ? true : false;
+  // If the pc was set to zero, consider this the final frame. Exception: if
+  // this is the sigreturn frame, then we want to try to recover the real PC
+  // using the return address (from LR or the stack), so keep going.
+  *finished = (cur_regs->pc() == 0 && !cie->is_signal_frame) ? true : false;
 
   cur_regs->set_sp(eval_info.cfa);
 
diff --git a/libunwindstack/Elf.cpp b/libunwindstack/Elf.cpp
index 286febc..e098a58 100644
--- a/libunwindstack/Elf.cpp
+++ b/libunwindstack/Elf.cpp
@@ -188,14 +188,15 @@
 }
 
 // The relative pc is always relative to the start of the map from which it comes.
-bool Elf::Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished) {
+bool Elf::Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished,
+               bool* is_signal_frame) {
   if (!valid_) {
     return false;
   }
 
   // Lock during the step which can update information in the object.
   std::lock_guard<std::mutex> guard(lock_);
-  return interface_->Step(rel_pc, regs, process_memory, finished);
+  return interface_->Step(rel_pc, regs, process_memory, finished, is_signal_frame);
 }
 
 bool Elf::IsValidElf(Memory* memory) {
diff --git a/libunwindstack/ElfInterface.cpp b/libunwindstack/ElfInterface.cpp
index 17470fd..0188def 100644
--- a/libunwindstack/ElfInterface.cpp
+++ b/libunwindstack/ElfInterface.cpp
@@ -499,25 +499,27 @@
   return false;
 }
 
-bool ElfInterface::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished) {
+bool ElfInterface::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished,
+                        bool* is_signal_frame) {
   last_error_.code = ERROR_NONE;
   last_error_.address = 0;
 
   // Try the debug_frame first since it contains the most specific unwind
   // information.
   DwarfSection* debug_frame = debug_frame_.get();
-  if (debug_frame != nullptr && debug_frame->Step(pc, regs, process_memory, finished)) {
+  if (debug_frame != nullptr &&
+      debug_frame->Step(pc, regs, process_memory, finished, is_signal_frame)) {
     return true;
   }
 
   // Try the eh_frame next.
   DwarfSection* eh_frame = eh_frame_.get();
-  if (eh_frame != nullptr && eh_frame->Step(pc, regs, process_memory, finished)) {
+  if (eh_frame != nullptr && eh_frame->Step(pc, regs, process_memory, finished, is_signal_frame)) {
     return true;
   }
 
   if (gnu_debugdata_interface_ != nullptr &&
-      gnu_debugdata_interface_->Step(pc, regs, process_memory, finished)) {
+      gnu_debugdata_interface_->Step(pc, regs, process_memory, finished, is_signal_frame)) {
     return true;
   }
 
diff --git a/libunwindstack/ElfInterfaceArm.cpp b/libunwindstack/ElfInterfaceArm.cpp
index 76f2dc8..9352a5d 100644
--- a/libunwindstack/ElfInterfaceArm.cpp
+++ b/libunwindstack/ElfInterfaceArm.cpp
@@ -100,12 +100,13 @@
   total_entries_ = ph_filesz / 8;
 }
 
-bool ElfInterfaceArm::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished) {
+bool ElfInterfaceArm::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished,
+                           bool* is_signal_frame) {
   // Dwarf unwind information is precise about whether a pc is covered or not,
   // but arm unwind information only has ranges of pc. In order to avoid
   // incorrectly doing a bad unwind using arm unwind information for a
   // different function, always try and unwind with the dwarf information first.
-  return ElfInterface32::Step(pc, regs, process_memory, finished) ||
+  return ElfInterface32::Step(pc, regs, process_memory, finished, is_signal_frame) ||
          StepExidx(pc, regs, process_memory, finished);
 }
 
diff --git a/libunwindstack/ElfInterfaceArm.h b/libunwindstack/ElfInterfaceArm.h
index 1d71cac..fd824f8 100644
--- a/libunwindstack/ElfInterfaceArm.h
+++ b/libunwindstack/ElfInterfaceArm.h
@@ -72,7 +72,8 @@
 
   void HandleUnknownType(uint32_t type, uint64_t ph_offset, uint64_t ph_filesz) override;
 
-  bool Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished) override;
+  bool Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished,
+            bool* is_signal_frame) override;
 
   bool StepExidx(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished);
 
diff --git a/libunwindstack/LocalUnwinder.cpp b/libunwindstack/LocalUnwinder.cpp
index 05650fb..5f51a73 100644
--- a/libunwindstack/LocalUnwinder.cpp
+++ b/libunwindstack/LocalUnwinder.cpp
@@ -113,9 +113,11 @@
     step_pc -= pc_adjustment;
 
     bool finished = false;
+    bool is_signal_frame = false;
     if (elf->StepIfSignalHandler(rel_pc, regs.get(), process_memory_.get())) {
       step_pc = rel_pc;
-    } else if (!elf->Step(step_pc, regs.get(), process_memory_.get(), &finished)) {
+    } else if (!elf->Step(step_pc, regs.get(), process_memory_.get(), &finished,
+                          &is_signal_frame)) {
       finished = true;
     }
 
diff --git a/libunwindstack/Unwinder.cpp b/libunwindstack/Unwinder.cpp
index bcdbde8..9ffc0f7 100644
--- a/libunwindstack/Unwinder.cpp
+++ b/libunwindstack/Unwinder.cpp
@@ -242,18 +242,21 @@
           // some of the speculative frames.
           in_device_map = true;
         } else {
+          bool is_signal_frame = false;
           if (elf->StepIfSignalHandler(rel_pc, regs_, process_memory_.get())) {
             stepped = true;
-            if (frame != nullptr) {
-              // Need to adjust the relative pc because the signal handler
-              // pc should not be adjusted.
-              frame->rel_pc = rel_pc;
-              frame->pc += pc_adjustment;
-              step_pc = rel_pc;
-            }
-          } else if (elf->Step(step_pc, regs_, process_memory_.get(), &finished)) {
+            is_signal_frame = true;
+          } else if (elf->Step(step_pc, regs_, process_memory_.get(), &finished,
+                               &is_signal_frame)) {
             stepped = true;
           }
+          if (is_signal_frame && frame != nullptr) {
+            // Need to adjust the relative pc because the signal handler
+            // pc should not be adjusted.
+            frame->rel_pc = rel_pc;
+            frame->pc += pc_adjustment;
+            step_pc = rel_pc;
+          }
           elf->GetLastError(&last_error_);
         }
       }
diff --git a/libunwindstack/include/unwindstack/DwarfSection.h b/libunwindstack/include/unwindstack/DwarfSection.h
index af823da..f28cf25 100644
--- a/libunwindstack/include/unwindstack/DwarfSection.h
+++ b/libunwindstack/include/unwindstack/DwarfSection.h
@@ -106,7 +106,7 @@
 
   virtual uint64_t AdjustPcFromFde(uint64_t pc) = 0;
 
-  bool Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished);
+  bool Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished, bool* is_signal_frame);
 
  protected:
   DwarfMemory memory_;
diff --git a/libunwindstack/include/unwindstack/DwarfStructs.h b/libunwindstack/include/unwindstack/DwarfStructs.h
index 4b481f0..3d8c2db 100644
--- a/libunwindstack/include/unwindstack/DwarfStructs.h
+++ b/libunwindstack/include/unwindstack/DwarfStructs.h
@@ -35,6 +35,7 @@
   uint64_t code_alignment_factor = 0;
   int64_t data_alignment_factor = 0;
   uint64_t return_address_register = 0;
+  bool is_signal_frame = false;
 };
 
 struct DwarfFde {
diff --git a/libunwindstack/include/unwindstack/Elf.h b/libunwindstack/include/unwindstack/Elf.h
index 97614b1..e15b221 100644
--- a/libunwindstack/include/unwindstack/Elf.h
+++ b/libunwindstack/include/unwindstack/Elf.h
@@ -60,7 +60,8 @@
 
   bool StepIfSignalHandler(uint64_t rel_pc, Regs* regs, Memory* process_memory);
 
-  bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished);
+  bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished,
+            bool* is_signal_frame);
 
   ElfInterface* CreateInterfaceFromMemory(Memory* memory);
 
diff --git a/libunwindstack/include/unwindstack/ElfInterface.h b/libunwindstack/include/unwindstack/ElfInterface.h
index 0c39b23..5df7ddf 100644
--- a/libunwindstack/include/unwindstack/ElfInterface.h
+++ b/libunwindstack/include/unwindstack/ElfInterface.h
@@ -64,7 +64,8 @@
 
   virtual std::string GetBuildID() = 0;
 
-  virtual bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished);
+  virtual bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished,
+                    bool* is_signal_frame);
 
   virtual bool IsValidPc(uint64_t pc);
 
diff --git a/libunwindstack/tests/DwarfSectionTest.cpp b/libunwindstack/tests/DwarfSectionTest.cpp
index febd6d3..e5a1aed 100644
--- a/libunwindstack/tests/DwarfSectionTest.cpp
+++ b/libunwindstack/tests/DwarfSectionTest.cpp
@@ -68,7 +68,8 @@
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(nullptr));
 
   bool finished;
-  ASSERT_FALSE(section_->Step(0x1000, nullptr, nullptr, &finished));
+  bool is_signal_frame;
+  ASSERT_FALSE(section_->Step(0x1000, nullptr, nullptr, &finished, &is_signal_frame));
 }
 
 TEST_F(DwarfSectionTest, Step_fail_cie_null) {
@@ -79,7 +80,8 @@
   EXPECT_CALL(*section_, GetFdeFromPc(0x1000)).WillOnce(::testing::Return(&fde));
 
   bool finished;
-  ASSERT_FALSE(section_->Step(0x1000, &regs_, nullptr, &finished));
+  bool is_signal_frame;
+  ASSERT_FALSE(section_->Step(0x1000, &regs_, nullptr, &finished, &is_signal_frame));
 }
 
 TEST_F(DwarfSectionTest, Step_fail_cfa_location) {
@@ -93,7 +95,8 @@
       .WillOnce(::testing::Return(false));
 
   bool finished;
-  ASSERT_FALSE(section_->Step(0x1000, &regs_, nullptr, &finished));
+  bool is_signal_frame;
+  ASSERT_FALSE(section_->Step(0x1000, &regs_, nullptr, &finished, &is_signal_frame));
 }
 
 TEST_F(DwarfSectionTest, Step_pass) {
@@ -111,7 +114,8 @@
       .WillOnce(::testing::Return(true));
 
   bool finished;
-  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
+  bool is_signal_frame;
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished, &is_signal_frame));
 }
 
 static bool MockGetCfaLocationInfo(::testing::Unused, const DwarfFde* fde,
@@ -137,9 +141,10 @@
       .WillRepeatedly(::testing::Return(true));
 
   bool finished;
-  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
-  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
-  ASSERT_TRUE(section_->Step(0x1500, &regs_, &process, &finished));
+  bool is_signal_frame;
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished, &is_signal_frame));
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished, &is_signal_frame));
+  ASSERT_TRUE(section_->Step(0x1500, &regs_, &process, &finished, &is_signal_frame));
 }
 
 TEST_F(DwarfSectionTest, Step_cache_not_in_pc) {
@@ -157,7 +162,8 @@
       .WillRepeatedly(::testing::Return(true));
 
   bool finished;
-  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished));
+  bool is_signal_frame;
+  ASSERT_TRUE(section_->Step(0x1000, &regs_, &process, &finished, &is_signal_frame));
 
   DwarfFde fde1{};
   fde1.pc_start = 0x500;
@@ -167,8 +173,8 @@
   EXPECT_CALL(*section_, GetCfaLocationInfo(0x600, &fde1, ::testing::_, ::testing::_))
       .WillOnce(::testing::Invoke(MockGetCfaLocationInfo));
 
-  ASSERT_TRUE(section_->Step(0x600, &regs_, &process, &finished));
-  ASSERT_TRUE(section_->Step(0x700, &regs_, &process, &finished));
+  ASSERT_TRUE(section_->Step(0x600, &regs_, &process, &finished, &is_signal_frame));
+  ASSERT_TRUE(section_->Step(0x700, &regs_, &process, &finished, &is_signal_frame));
 }
 
 }  // namespace unwindstack
diff --git a/libunwindstack/tests/ElfFake.cpp b/libunwindstack/tests/ElfFake.cpp
index 3d5ddd6..b16cd53 100644
--- a/libunwindstack/tests/ElfFake.cpp
+++ b/libunwindstack/tests/ElfFake.cpp
@@ -52,7 +52,7 @@
   return true;
 }
 
-bool ElfInterfaceFake::Step(uint64_t, Regs* regs, Memory*, bool* finished) {
+bool ElfInterfaceFake::Step(uint64_t, Regs* regs, Memory*, bool* finished, bool* is_signal_frame) {
   if (steps_.empty()) {
     return false;
   }
@@ -68,6 +68,7 @@
   fake_regs->set_pc(entry.pc);
   fake_regs->set_sp(entry.sp);
   *finished = entry.finished;
+  *is_signal_frame = false;
   return true;
 }
 
diff --git a/libunwindstack/tests/ElfFake.h b/libunwindstack/tests/ElfFake.h
index 3b6cb80..abda7b8 100644
--- a/libunwindstack/tests/ElfFake.h
+++ b/libunwindstack/tests/ElfFake.h
@@ -76,7 +76,7 @@
   bool GetGlobalVariable(const std::string&, uint64_t*) override;
   std::string GetBuildID() override { return fake_build_id_; }
 
-  bool Step(uint64_t, Regs*, Memory*, bool*) override;
+  bool Step(uint64_t, Regs*, Memory*, bool*, bool*) override;
 
   void FakeSetGlobalVariable(const std::string& global, uint64_t offset) {
     globals_[global] = offset;
diff --git a/libunwindstack/tests/ElfTest.cpp b/libunwindstack/tests/ElfTest.cpp
index f0852a4..d81edbf 100644
--- a/libunwindstack/tests/ElfTest.cpp
+++ b/libunwindstack/tests/ElfTest.cpp
@@ -138,7 +138,8 @@
   EXPECT_EQ(ERROR_INVALID_ELF, elf.GetLastErrorCode());
 
   bool finished;
-  ASSERT_FALSE(elf.Step(0, nullptr, nullptr, &finished));
+  bool is_signal_frame;
+  ASSERT_FALSE(elf.Step(0, nullptr, nullptr, &finished, &is_signal_frame));
   EXPECT_EQ(ERROR_INVALID_ELF, elf.GetLastErrorCode());
 }
 
@@ -327,7 +328,7 @@
   bool GetFunctionName(uint64_t, std::string*, uint64_t*) override { return false; }
   std::string GetBuildID() override { return ""; }
 
-  MOCK_METHOD(bool, Step, (uint64_t, Regs*, Memory*, bool*), (override));
+  MOCK_METHOD(bool, Step, (uint64_t, Regs*, Memory*, bool*, bool*), (override));
   MOCK_METHOD(bool, GetGlobalVariable, (const std::string&, uint64_t*), (override));
   MOCK_METHOD(bool, IsValidPc, (uint64_t), (override));
 
@@ -351,10 +352,11 @@
   MemoryFake process_memory;
 
   bool finished;
-  EXPECT_CALL(*interface, Step(0x1000, &regs, &process_memory, &finished))
+  bool is_signal_frame;
+  EXPECT_CALL(*interface, Step(0x1000, &regs, &process_memory, &finished, &is_signal_frame))
       .WillOnce(::testing::Return(true));
 
-  ASSERT_TRUE(elf.Step(0x1000, &regs, &process_memory, &finished));
+  ASSERT_TRUE(elf.Step(0x1000, &regs, &process_memory, &finished, &is_signal_frame));
 }
 
 TEST_F(ElfTest, get_global_invalid_elf) {
diff --git a/libunwindstack/tests/UnwindOfflineTest.cpp b/libunwindstack/tests/UnwindOfflineTest.cpp
index 0c6f9f8..ab427b5 100644
--- a/libunwindstack/tests/UnwindOfflineTest.cpp
+++ b/libunwindstack/tests/UnwindOfflineTest.cpp
@@ -1736,4 +1736,158 @@
   EXPECT_EQ(0x7ffb6c0f30U, unwinder.frames()[6].sp);
 }
 
+// This test has a libc.so where the __restore has been changed so
+// that the signal handler match does not occur and it uses the
+// fde to do the unwind.
+TEST_F(UnwindOfflineTest, signal_fde_x86) {
+  ASSERT_NO_FATAL_FAILURE(Init("signal_fde_x86/", ARCH_X86));
+
+  Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
+  unwinder.Unwind();
+
+  std::string frame_info(DumpFrames(unwinder));
+  ASSERT_EQ(20U, unwinder.NumFrames()) << "Unwind:\n" << frame_info;
+  EXPECT_EQ(
+      "  #00 pc 007914d9  libunwindstack_test (SignalInnerFunction+25)\n"
+      "  #01 pc 007914fc  libunwindstack_test (SignalMiddleFunction+28)\n"
+      "  #02 pc 0079152c  libunwindstack_test (SignalOuterFunction+28)\n"
+      "  #03 pc 0079af62  libunwindstack_test (unwindstack::SignalCallerHandler(int, siginfo*, "
+      "void*)+50)\n"
+      "  #04 pc 00058fb0  libc.so (__restore)\n"
+      "  #05 pc 00000000  <unknown>\n"
+      "  #06 pc 0079161a  libunwindstack_test (InnerFunction+218)\n"
+      "  #07 pc 007923aa  libunwindstack_test (MiddleFunction+42)\n"
+      "  #08 pc 007923ea  libunwindstack_test (OuterFunction+42)\n"
+      "  #09 pc 00797444  libunwindstack_test (unwindstack::RemoteThroughSignal(int, unsigned "
+      "int)+868)\n"
+      "  #10 pc 007985b8  libunwindstack_test "
+      "(unwindstack::UnwindTest_remote_through_signal_with_invalid_func_Test::TestBody()+56)\n"
+      "  #11 pc 00817a19  libunwindstack_test\n"
+      "  #12 pc 008178c5  libunwindstack_test (testing::Test::Run()+277)\n"
+      "  #13 pc 00818d3e  libunwindstack_test (testing::TestInfo::Run()+318)\n"
+      "  #14 pc 008198b4  libunwindstack_test (testing::TestSuite::Run()+436)\n"
+      "  #15 pc 00828cb0  libunwindstack_test "
+      "(testing::internal::UnitTestImpl::RunAllTests()+1216)\n"
+      "  #16 pc 0082870f  libunwindstack_test (testing::UnitTest::Run()+367)\n"
+      "  #17 pc 0084031e  libunwindstack_test (IsolateMain+2334)\n"
+      "  #18 pc 0083f9e9  libunwindstack_test (main+41)\n"
+      "  #19 pc 00050646  libc.so (__libc_init+118)\n",
+      frame_info);
+
+  EXPECT_EQ(0x5ae0d4d9U, unwinder.frames()[0].pc);
+  EXPECT_EQ(0xecb37188U, unwinder.frames()[0].sp);
+  EXPECT_EQ(0x5ae0d4fcU, unwinder.frames()[1].pc);
+  EXPECT_EQ(0xecb37190U, unwinder.frames()[1].sp);
+  EXPECT_EQ(0x5ae0d52cU, unwinder.frames()[2].pc);
+  EXPECT_EQ(0xecb371b0U, unwinder.frames()[2].sp);
+  EXPECT_EQ(0x5ae16f62U, unwinder.frames()[3].pc);
+  EXPECT_EQ(0xecb371d0U, unwinder.frames()[3].sp);
+  EXPECT_EQ(0xec169fb0U, unwinder.frames()[4].pc);
+  EXPECT_EQ(0xecb371f0U, unwinder.frames()[4].sp);
+  EXPECT_EQ(0x0U, unwinder.frames()[5].pc);
+  EXPECT_EQ(0xffcfac6cU, unwinder.frames()[5].sp);
+  EXPECT_EQ(0x5ae0d61aU, unwinder.frames()[6].pc);
+  EXPECT_EQ(0xffcfac6cU, unwinder.frames()[6].sp);
+  EXPECT_EQ(0x5ae0e3aaU, unwinder.frames()[7].pc);
+  EXPECT_EQ(0xffcfad60U, unwinder.frames()[7].sp);
+  EXPECT_EQ(0x5ae0e3eaU, unwinder.frames()[8].pc);
+  EXPECT_EQ(0xffcfad90U, unwinder.frames()[8].sp);
+  EXPECT_EQ(0x5ae13444U, unwinder.frames()[9].pc);
+  EXPECT_EQ(0xffcfadc0U, unwinder.frames()[9].sp);
+  EXPECT_EQ(0x5ae145b8U, unwinder.frames()[10].pc);
+  EXPECT_EQ(0xffcfb020U, unwinder.frames()[10].sp);
+  EXPECT_EQ(0x5ae93a19U, unwinder.frames()[11].pc);
+  EXPECT_EQ(0xffcfb050U, unwinder.frames()[11].sp);
+  EXPECT_EQ(0x5ae938c5U, unwinder.frames()[12].pc);
+  EXPECT_EQ(0xffcfb090U, unwinder.frames()[12].sp);
+  EXPECT_EQ(0x5ae94d3eU, unwinder.frames()[13].pc);
+  EXPECT_EQ(0xffcfb0f0U, unwinder.frames()[13].sp);
+  EXPECT_EQ(0x5ae958b4U, unwinder.frames()[14].pc);
+  EXPECT_EQ(0xffcfb160U, unwinder.frames()[14].sp);
+  EXPECT_EQ(0x5aea4cb0U, unwinder.frames()[15].pc);
+  EXPECT_EQ(0xffcfb1d0U, unwinder.frames()[15].sp);
+  EXPECT_EQ(0x5aea470fU, unwinder.frames()[16].pc);
+  EXPECT_EQ(0xffcfb270U, unwinder.frames()[16].sp);
+  EXPECT_EQ(0x5aebc31eU, unwinder.frames()[17].pc);
+  EXPECT_EQ(0xffcfb2c0U, unwinder.frames()[17].sp);
+  EXPECT_EQ(0x5aebb9e9U, unwinder.frames()[18].pc);
+  EXPECT_EQ(0xffcfc3c0U, unwinder.frames()[18].sp);
+  EXPECT_EQ(0xec161646U, unwinder.frames()[19].pc);
+  EXPECT_EQ(0xffcfc3f0U, unwinder.frames()[19].sp);
+}
+
+// This test has a libc.so where the __restore_rt has been changed so
+// that the signal handler match does not occur and it uses the
+// fde to do the unwind.
+TEST_F(UnwindOfflineTest, signal_fde_x86_64) {
+  ASSERT_NO_FATAL_FAILURE(Init("signal_fde_x86_64/", ARCH_X86_64));
+
+  Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
+  unwinder.Unwind();
+
+  std::string frame_info(DumpFrames(unwinder));
+  ASSERT_EQ(18U, unwinder.NumFrames()) << "Unwind:\n" << frame_info;
+  EXPECT_EQ(
+      "  #00 pc 000000000058415b  libunwindstack_test (SignalInnerFunction+11)\n"
+      "  #01 pc 0000000000584168  libunwindstack_test (SignalMiddleFunction+8)\n"
+      "  #02 pc 0000000000584178  libunwindstack_test (SignalOuterFunction+8)\n"
+      "  #03 pc 000000000058ac77  libunwindstack_test (unwindstack::SignalCallerHandler(int, "
+      "siginfo*, void*)+23)\n"
+      "  #04 pc 0000000000057d10  libc.so (__restore_rt)\n"
+      "  #05 pc 0000000000000000  <unknown>\n"
+      "  #06 pc 0000000000584244  libunwindstack_test (InnerFunction+196)\n"
+      "  #07 pc 0000000000584b44  libunwindstack_test (MiddleFunction+20)\n"
+      "  #08 pc 0000000000584b64  libunwindstack_test (OuterFunction+20)\n"
+      "  #09 pc 0000000000588457  libunwindstack_test (unwindstack::RemoteThroughSignal(int, "
+      "unsigned int)+583)\n"
+      "  #10 pc 0000000000588f67  libunwindstack_test "
+      "(unwindstack::UnwindTest_remote_through_signal_with_invalid_func_Test::TestBody()+23)\n"
+      "  #11 pc 00000000005d9c38  libunwindstack_test (testing::Test::Run()+216)\n"
+      "  #12 pc 00000000005daf9a  libunwindstack_test (testing::TestInfo::Run()+266)\n"
+      "  #13 pc 00000000005dba46  libunwindstack_test (testing::TestSuite::Run()+390)\n"
+      "  #14 pc 00000000005ea4c6  libunwindstack_test "
+      "(testing::internal::UnitTestImpl::RunAllTests()+1190)\n"
+      "  #15 pc 00000000005e9f61  libunwindstack_test (testing::UnitTest::Run()+337)\n"
+      "  #16 pc 0000000000600155  libunwindstack_test (IsolateMain+2037)\n"
+      "  #17 pc 000000000004e405  libc.so (__libc_init+101)\n",
+      frame_info);
+
+  EXPECT_EQ(0x5bb41271e15bU, unwinder.frames()[0].pc);
+  EXPECT_EQ(0x707eb5aa8320U, unwinder.frames()[0].sp);
+  EXPECT_EQ(0x5bb41271e168U, unwinder.frames()[1].pc);
+  EXPECT_EQ(0x707eb5aa8330U, unwinder.frames()[1].sp);
+  EXPECT_EQ(0x5bb41271e178U, unwinder.frames()[2].pc);
+  EXPECT_EQ(0x707eb5aa8340U, unwinder.frames()[2].sp);
+  EXPECT_EQ(0x5bb412724c77U, unwinder.frames()[3].pc);
+  EXPECT_EQ(0x707eb5aa8350U, unwinder.frames()[3].sp);
+  EXPECT_EQ(0x707eb2ca5d10U, unwinder.frames()[4].pc);
+  EXPECT_EQ(0x707eb5aa8380U, unwinder.frames()[4].sp);
+  EXPECT_EQ(0x0U, unwinder.frames()[5].pc);
+  EXPECT_EQ(0x7ffcaadde078U, unwinder.frames()[5].sp);
+  EXPECT_EQ(0x5bb41271e244U, unwinder.frames()[6].pc);
+  EXPECT_EQ(0x7ffcaadde078U, unwinder.frames()[6].sp);
+  EXPECT_EQ(0x5bb41271eb44U, unwinder.frames()[7].pc);
+  EXPECT_EQ(0x7ffcaadde1a0U, unwinder.frames()[7].sp);
+  EXPECT_EQ(0x5bb41271eb64U, unwinder.frames()[8].pc);
+  EXPECT_EQ(0x7ffcaadde1c0U, unwinder.frames()[8].sp);
+  EXPECT_EQ(0x5bb412722457U, unwinder.frames()[9].pc);
+  EXPECT_EQ(0x7ffcaadde1e0U, unwinder.frames()[9].sp);
+  EXPECT_EQ(0x5bb412722f67U, unwinder.frames()[10].pc);
+  EXPECT_EQ(0x7ffcaadde510U, unwinder.frames()[10].sp);
+  EXPECT_EQ(0x5bb412773c38U, unwinder.frames()[11].pc);
+  EXPECT_EQ(0x7ffcaadde530U, unwinder.frames()[11].sp);
+  EXPECT_EQ(0x5bb412774f9aU, unwinder.frames()[12].pc);
+  EXPECT_EQ(0x7ffcaadde560U, unwinder.frames()[12].sp);
+  EXPECT_EQ(0x5bb412775a46U, unwinder.frames()[13].pc);
+  EXPECT_EQ(0x7ffcaadde5b0U, unwinder.frames()[13].sp);
+  EXPECT_EQ(0x5bb4127844c6U, unwinder.frames()[14].pc);
+  EXPECT_EQ(0x7ffcaadde5f0U, unwinder.frames()[14].sp);
+  EXPECT_EQ(0x5bb412783f61U, unwinder.frames()[15].pc);
+  EXPECT_EQ(0x7ffcaadde6c0U, unwinder.frames()[15].sp);
+  EXPECT_EQ(0x5bb41279a155U, unwinder.frames()[16].pc);
+  EXPECT_EQ(0x7ffcaadde720U, unwinder.frames()[16].sp);
+  EXPECT_EQ(0x707eb2c9c405U, unwinder.frames()[17].pc);
+  EXPECT_EQ(0x7ffcaaddf870U, unwinder.frames()[17].sp);
+}
+
 }  // namespace unwindstack
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86/libc.so b/libunwindstack/tests/files/offline/signal_fde_x86/libc.so
new file mode 100644
index 0000000..5c882e4
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86/libc.so
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86/libunwindstack_test b/libunwindstack/tests/files/offline/signal_fde_x86/libunwindstack_test
new file mode 100644
index 0000000..8dcff67
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86/libunwindstack_test
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86/maps.txt b/libunwindstack/tests/files/offline/signal_fde_x86/maps.txt
new file mode 100644
index 0000000..6166a9d
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86/maps.txt
@@ -0,0 +1,4 @@
+5a67c000-5a7ba000 r--p 0 00:00 0   libunwindstack_test
+5a7ba000-5aedd000 r-xp 13d000 00:00 0   libunwindstack_test
+ec111000-ec153000 r--p 0 00:00 0   libc.so
+ec153000-ec200000 r-xp 41000 00:00 0   libc.so
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86/regs.txt b/libunwindstack/tests/files/offline/signal_fde_x86/regs.txt
new file mode 100644
index 0000000..456b212
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86/regs.txt
@@ -0,0 +1,9 @@
+eax: 5aeec4ac
+ebx: 5aeec4ac
+ecx: 0
+edx: 6b
+ebp: ecb37188
+edi: ebecda30
+esi: b
+esp: ecb37188
+eip: 5ae0d4d9
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86/stack0.data b/libunwindstack/tests/files/offline/signal_fde_x86/stack0.data
new file mode 100644
index 0000000..0bbbe22
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86/stack0.data
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86/stack1.data b/libunwindstack/tests/files/offline/signal_fde_x86/stack1.data
new file mode 100644
index 0000000..0873046
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86/stack1.data
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86_64/libc.so b/libunwindstack/tests/files/offline/signal_fde_x86_64/libc.so
new file mode 100644
index 0000000..cea7336
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86_64/libc.so
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86_64/libunwindstack_test b/libunwindstack/tests/files/offline/signal_fde_x86_64/libunwindstack_test
new file mode 100644
index 0000000..c48e84e
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86_64/libunwindstack_test
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86_64/maps.txt b/libunwindstack/tests/files/offline/signal_fde_x86_64/maps.txt
new file mode 100644
index 0000000..514aa71
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86_64/maps.txt
@@ -0,0 +1,4 @@
+5bb41219a000-5bb4122cd000 r--p 0 00:00 0   libunwindstack_test
+5bb4122cd000-5bb4127b9000 r-xp 132000 00:00 0   libunwindstack_test
+707eb2c4e000-707eb2c91000 r--p 0 00:00 0   libc.so
+707eb2c91000-707eb2d1b000 r-xp 42000 00:00 0   libc.so
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86_64/regs.txt b/libunwindstack/tests/files/offline/signal_fde_x86_64/regs.txt
new file mode 100644
index 0000000..8da7b4e
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86_64/regs.txt
@@ -0,0 +1,17 @@
+rax: 0
+rbx: 707d82c59c60
+rcx: 4
+rdx: 707eb5aa8380
+r8: 7ffcaadde470
+r9: 7ffcaadde478
+r10: 8
+r11: 206
+r12: 707cb2c64330
+r13: 0
+r14: 174e9096a8f
+r15: 707d52c96cb0
+rdi: b
+rsi: 707eb5aa84b0
+rbp: 707eb5aa8320
+rsp: 707eb5aa8320
+rip: 5bb41271e15b
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86_64/stack0.data b/libunwindstack/tests/files/offline/signal_fde_x86_64/stack0.data
new file mode 100644
index 0000000..e19a016
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86_64/stack0.data
Binary files differ
diff --git a/libunwindstack/tests/files/offline/signal_fde_x86_64/stack1.data b/libunwindstack/tests/files/offline/signal_fde_x86_64/stack1.data
new file mode 100644
index 0000000..3435f7c
--- /dev/null
+++ b/libunwindstack/tests/files/offline/signal_fde_x86_64/stack1.data
Binary files differ
diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index c837891..3dc2026 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -309,8 +309,14 @@
     n = vsnprintf(nullptr, 0, fmt, tmp_args);
     va_end(tmp_args);
 
-    if (n != 0) {
+    if (n < 0) return UNKNOWN_ERROR;
+
+    if (n > 0) {
         size_t oldLength = length();
+        if ((size_t)n > SIZE_MAX - 1 ||
+            oldLength > SIZE_MAX - (size_t)n - 1) {
+            return NO_MEMORY;
+        }
         char* buf = lockBuffer(oldLength + n);
         if (buf) {
             vsnprintf(buf + oldLength, n + 1, fmt, args);
diff --git a/logd/Android.bp b/logd/Android.bp
index 335a174..a7de561 100644
--- a/logd/Android.bp
+++ b/logd/Android.bp
@@ -186,7 +186,6 @@
     test_suites: [
         "cts",
         "device-tests",
-        "vts10",
     ],
 }
 
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index a98c4b9..0259266 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 
 #include <functional>
+#include <memory>
 
 #include <log/log.h>
 #include <log/log_read.h>
@@ -62,6 +63,7 @@
                     const char* msg, uint16_t len) = 0;
 
     virtual std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask) = 0;
+    virtual void DeleteFlushToState(std::unique_ptr<FlushToState>) {}
     virtual bool FlushTo(
             LogWriter* writer, FlushToState& state,
             const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
diff --git a/logd/LogReaderThread.cpp b/logd/LogReaderThread.cpp
index 4a8be01..6ac9741 100644
--- a/logd/LogReaderThread.cpp
+++ b/logd/LogReaderThread.cpp
@@ -72,6 +72,7 @@
                     [this](log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime) {
                         return FilterFirstPass(log_id, pid, sequence, realtime);
                     });
+            log_buffer_->DeleteFlushToState(std::move(first_pass_state));
         }
         bool flush_success = log_buffer_->FlushTo(
                 writer_.get(), *flush_to_state_,
@@ -105,6 +106,10 @@
         }
     }
 
+    lock.unlock();
+    log_buffer_->DeleteFlushToState(std::move(flush_to_state_));
+    lock.lock();
+
     writer_->Release();
 
     auto& log_reader_threads = reader_list_->reader_threads();
diff --git a/logd/LogReaderThread.h b/logd/LogReaderThread.h
index 20624f2..f1b673f 100644
--- a/logd/LogReaderThread.h
+++ b/logd/LogReaderThread.h
@@ -53,7 +53,7 @@
 
     bool IsWatching(log_id_t id) const { return flush_to_state_->log_mask() & (1 << id); }
     bool IsWatchingMultiple(LogMask log_mask) const {
-        return flush_to_state_->log_mask() & log_mask;
+        return flush_to_state_ && flush_to_state_->log_mask() & log_mask;
     }
 
     std::string name() const { return writer_->name(); }
diff --git a/logd/SerializedLogBuffer.cpp b/logd/SerializedLogBuffer.cpp
index fa90878..6d1576f 100644
--- a/logd/SerializedLogBuffer.cpp
+++ b/logd/SerializedLogBuffer.cpp
@@ -201,6 +201,11 @@
     return std::make_unique<SerializedFlushToState>(start, log_mask);
 }
 
+void SerializedLogBuffer::DeleteFlushToState(std::unique_ptr<FlushToState> state) {
+    auto lock = std::unique_lock{lock_};
+    state.reset();
+}
+
 bool SerializedLogBuffer::FlushTo(
         LogWriter* writer, FlushToState& abstract_state,
         const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
diff --git a/logd/SerializedLogBuffer.h b/logd/SerializedLogBuffer.h
index 294cfe6..9164526 100644
--- a/logd/SerializedLogBuffer.h
+++ b/logd/SerializedLogBuffer.h
@@ -42,6 +42,7 @@
     int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
             uint16_t len) override;
     std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask) override;
+    void DeleteFlushToState(std::unique_ptr<FlushToState> state) override;
     bool FlushTo(LogWriter* writer, FlushToState& state,
                  const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
                                                   log_time realtime)>& filter) override;
diff --git a/logd/SerializedLogChunkTest.cpp b/logd/SerializedLogChunkTest.cpp
index 3b45125..862c3fe 100644
--- a/logd/SerializedLogChunkTest.cpp
+++ b/logd/SerializedLogChunkTest.cpp
@@ -99,13 +99,9 @@
             "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"                  // Timestamp
             "\x0C\x00last message";                             // msg_len + message
 
-    for (size_t i = 0; i < chunk_size; ++i) {
-        if (i < sizeof(expected_buffer_data)) {
-            EXPECT_EQ(static_cast<uint8_t>(expected_buffer_data[i]), chunk.data()[i])
-                    << "position: " << i;
-        } else {
-            EXPECT_EQ(0, chunk.data()[i]) << "position: " << i;
-        }
+    for (size_t i = 0; i < sizeof(expected_buffer_data); ++i) {
+        EXPECT_EQ(static_cast<uint8_t>(expected_buffer_data[i]), chunk.data()[i])
+                << "position: " << i;
     }
 }
 
diff --git a/trusty/keymaster/set_attestation_key/set_attestation_key.cpp b/trusty/keymaster/set_attestation_key/set_attestation_key.cpp
index a89a4a8..6f74833 100644
--- a/trusty/keymaster/set_attestation_key/set_attestation_key.cpp
+++ b/trusty/keymaster/set_attestation_key/set_attestation_key.cpp
@@ -292,9 +292,14 @@
                 value = xmlTextReaderConstValue(xml);
                 uint32_t cmd;
                 if (xmlStrEqual(element, BAD_CAST "PrivateKey")) {
-                    cmd = KM_SET_ATTESTATION_KEY;
-                } else if (xmlStrEqual(element, BAD_CAST "WrappedPrivateKey")) {
-                    cmd = KM_SET_WRAPPED_ATTESTATION_KEY;
+                    if (xmlStrEqual(element_format, BAD_CAST "pem")) {
+                        cmd = KM_SET_ATTESTATION_KEY;
+                    } else if (xmlStrEqual(element_format, BAD_CAST "iecs")) {
+                        cmd = KM_SET_WRAPPED_ATTESTATION_KEY;
+                    } else {
+                        printf("unsupported key format: %s\n", element_format);
+                        return -1;
+                    }
                 } else if (xmlStrEqual(element, BAD_CAST "Certificate")) {
                     cmd = KM_APPEND_ATTESTATION_CERT_CHAIN;
                 } else {