diff --git a/debuggerd/libdebuggerd/utility.cpp b/debuggerd/libdebuggerd/utility.cpp
index 2c645b5..a7506b7 100644
--- a/debuggerd/libdebuggerd/utility.cpp
+++ b/debuggerd/libdebuggerd/utility.cpp
@@ -402,6 +402,8 @@
         case TRAP_HWBKPT: return "TRAP_HWBKPT";
         case TRAP_UNK:
           return "TRAP_UNDIAGNOSED";
+        case TRAP_PERF:
+          return "TRAP_PERF";
       }
       if ((si->si_code & 0xff) == SIGTRAP) {
         switch ((si->si_code >> 8) & 0xff) {
@@ -423,7 +425,7 @@
             return "PTRACE_EVENT_STOP";
         }
       }
-      static_assert(NSIGTRAP == TRAP_UNK, "missing TRAP_* si_code");
+      static_assert(NSIGTRAP == TRAP_PERF, "missing TRAP_* si_code");
       break;
   }
   // Then the other codes...
diff --git a/fs_mgr/libsnapshot/android/snapshot/snapshot.proto b/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
index c0649ca..e2abdba 100644
--- a/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
+++ b/fs_mgr/libsnapshot/android/snapshot/snapshot.proto
@@ -191,6 +191,9 @@
 
     // Merge failure code, filled if state == MergeFailed.
     MergeFailureCode merge_failure_code = 7;
+
+    // Source build fingerprint.
+    string source_build_fingerprint = 8;
 }
 
 // Next: 10
@@ -223,4 +226,7 @@
     // Merge failure code, filled if the merge failed at any time (regardless
     // of whether it succeeded at a later time).
     MergeFailureCode merge_failure_code = 9;
+
+    // The source fingerprint at the time the OTA was downloaded.
+    string source_build_fingerprint = 10;
 }
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
index 94d5055..ec58cca 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
@@ -60,6 +60,7 @@
     MOCK_METHOD(bool, Dump, (std::ostream & os), (override));
     MOCK_METHOD(std::unique_ptr<AutoDevice>, EnsureMetadataMounted, (), (override));
     MOCK_METHOD(ISnapshotMergeStats*, GetSnapshotMergeStatsInstance, (), (override));
+    MOCK_METHOD(std::string, ReadSourceBuildFingerprint, (), (override));
 };
 
 }  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h
index 067f99c..3d384cc 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot_merge_stats.h
@@ -35,13 +35,16 @@
     MOCK_METHOD(void, set_boot_complete_time_ms, (uint32_t), (override));
     MOCK_METHOD(void, set_boot_complete_to_merge_start_time_ms, (uint32_t), (override));
     MOCK_METHOD(void, set_merge_failure_code, (MergeFailureCode), (override));
+    MOCK_METHOD(void, set_source_build_fingerprint, (const std::string&), (override));
     MOCK_METHOD(uint64_t, cow_file_size, (), (override));
     MOCK_METHOD(uint64_t, total_cow_size_bytes, (), (override));
     MOCK_METHOD(uint64_t, estimated_cow_size_bytes, (), (override));
     MOCK_METHOD(uint32_t, boot_complete_time_ms, (), (override));
     MOCK_METHOD(uint32_t, boot_complete_to_merge_start_time_ms, (), (override));
+    MOCK_METHOD(std::string, source_build_fingerprint, (), (override));
     MOCK_METHOD(MergeFailureCode, merge_failure_code, (), (override));
     MOCK_METHOD(std::unique_ptr<Result>, Finish, (), (override));
+    MOCK_METHOD(bool, WriteState, (), (override));
 
     using ISnapshotMergeStats::Result;
     // Return nullptr if any failure.
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
index 65034f7..15882b3 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot.h
@@ -177,6 +177,9 @@
     // code. Otherwise, MergeFailureCode::Ok is returned.
     virtual MergeFailureCode ReadMergeFailureCode() = 0;
 
+    // If an update is in progress, return the source build fingerprint.
+    virtual std::string ReadSourceBuildFingerprint() = 0;
+
     // Find the status of the current update, if any.
     //
     // |progress| depends on the returned status:
@@ -369,6 +372,7 @@
     ISnapshotMergeStats* GetSnapshotMergeStatsInstance() override;
     bool MapAllSnapshots(const std::chrono::milliseconds& timeout_ms = {}) override;
     bool UnmapAllSnapshots() override;
+    std::string ReadSourceBuildFingerprint() override;
 
     // We can't use WaitForFile during first-stage init, because ueventd is not
     // running and therefore will not automatically create symlinks. Instead,
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
index 4ce5077..8c2fec7 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stats.h
@@ -35,12 +35,14 @@
     virtual void set_boot_complete_time_ms(uint32_t ms) = 0;
     virtual void set_boot_complete_to_merge_start_time_ms(uint32_t ms) = 0;
     virtual void set_merge_failure_code(MergeFailureCode code) = 0;
+    virtual void set_source_build_fingerprint(const std::string& fingerprint) = 0;
     virtual uint64_t cow_file_size() = 0;
     virtual uint64_t total_cow_size_bytes() = 0;
     virtual uint64_t estimated_cow_size_bytes() = 0;
     virtual uint32_t boot_complete_time_ms() = 0;
     virtual uint32_t boot_complete_to_merge_start_time_ms() = 0;
     virtual MergeFailureCode merge_failure_code() = 0;
+    virtual std::string source_build_fingerprint() = 0;
 
     // Called when merge ends. Properly clean up permanent storage.
     class Result {
@@ -52,6 +54,10 @@
     };
     // Return nullptr if any failure.
     virtual std::unique_ptr<Result> Finish() = 0;
+
+    // Write out the current state. This should be called when data might be lost that
+    // cannot be recovered (eg the COW sizes).
+    virtual bool WriteState() = 0;
 };
 
 class SnapshotMergeStats : public ISnapshotMergeStats {
@@ -74,11 +80,13 @@
     uint32_t boot_complete_to_merge_start_time_ms() override;
     void set_merge_failure_code(MergeFailureCode code) override;
     MergeFailureCode merge_failure_code() override;
+    void set_source_build_fingerprint(const std::string& fingerprint) override;
+    std::string source_build_fingerprint() override;
     std::unique_ptr<Result> Finish() override;
+    bool WriteState() override;
 
   private:
     bool ReadState();
-    bool WriteState();
     bool DeleteState();
     SnapshotMergeStats(const std::string& path);
 
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
index a7cd939..74b78c5 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/snapshot_stub.h
@@ -57,6 +57,7 @@
     ISnapshotMergeStats* GetSnapshotMergeStatsInstance() override;
     bool MapAllSnapshots(const std::chrono::milliseconds& timeout_ms) override;
     bool UnmapAllSnapshots() override;
+    std::string ReadSourceBuildFingerprint() override;
 };
 
 }  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index be732ec..0e36da1 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -716,7 +716,7 @@
         }
     }
 
-    SnapshotUpdateStatus initial_status;
+    SnapshotUpdateStatus initial_status = ReadSnapshotUpdateStatus(lock.get());
     initial_status.set_state(UpdateState::Merging);
     initial_status.set_sectors_allocated(initial_target_values.sectors_allocated);
     initial_status.set_total_sectors(initial_target_values.total_sectors);
@@ -2515,15 +2515,25 @@
     SnapshotUpdateStatus status;
     status.set_state(state);
 
-    if (state == UpdateState::MergeFailed) {
-        status.set_merge_failure_code(failure_code);
+    switch (state) {
+        case UpdateState::MergeFailed:
+            status.set_merge_failure_code(failure_code);
+            break;
+        case UpdateState::Initiated:
+            status.set_source_build_fingerprint(
+                    android::base::GetProperty("ro.build.fingerprint", ""));
+            break;
+        default:
+            break;
     }
 
     // If we're transitioning between two valid states (eg, we're not beginning
-    // or ending an OTA), then make sure to propagate the compression bit.
+    // or ending an OTA), then make sure to propagate the compression bit and
+    // build fingerprint.
     if (!(state == UpdateState::Initiated || state == UpdateState::None)) {
         SnapshotUpdateStatus old_status = ReadSnapshotUpdateStatus(lock);
         status.set_compression_enabled(old_status.compression_enabled());
+        status.set_source_build_fingerprint(old_status.source_build_fingerprint());
     }
     return WriteSnapshotUpdateStatus(lock, status);
 }
@@ -2838,7 +2848,7 @@
         }
     }
 
-    SnapshotUpdateStatus status = {};
+    SnapshotUpdateStatus status = ReadSnapshotUpdateStatus(lock.get());
     status.set_state(update_state);
     status.set_compression_enabled(cow_creator.compression_enabled);
     if (!WriteSnapshotUpdateStatus(lock.get(), status)) {
@@ -3264,9 +3274,10 @@
 
     std::stringstream ss;
 
+    auto update_status = ReadSnapshotUpdateStatus(file.get());
+
     ss << "Update state: " << ReadUpdateState(file.get()) << std::endl;
-    ss << "Compression: " << ReadSnapshotUpdateStatus(file.get()).compression_enabled()
-       << std::endl;
+    ss << "Compression: " << update_status.compression_enabled() << std::endl;
     ss << "Current slot: " << device_->GetSlotSuffix() << std::endl;
     ss << "Boot indicator: booting from " << GetCurrentSlot() << " slot" << std::endl;
     ss << "Rollback indicator: "
@@ -3275,6 +3286,7 @@
     ss << "Forward merge indicator: "
        << (access(GetForwardMergeIndicatorPath().c_str(), F_OK) == 0 ? "exists" : strerror(errno))
        << std::endl;
+    ss << "Source build fingerprint: " << update_status.source_build_fingerprint() << std::endl;
 
     bool ok = true;
     std::vector<std::string> snapshots;
@@ -3792,5 +3804,13 @@
     return status.merge_failure_code();
 }
 
+std::string SnapshotManager::ReadSourceBuildFingerprint() {
+    auto lock = LockExclusive();
+    if (!lock) return {};
+
+    SnapshotUpdateStatus status = ReadSnapshotUpdateStatus(lock.get());
+    return status.source_build_fingerprint();
+}
+
 }  // namespace snapshot
 }  // namespace android
diff --git a/fs_mgr/libsnapshot/snapshot_stats.cpp b/fs_mgr/libsnapshot/snapshot_stats.cpp
index 4a93d65..712eafb 100644
--- a/fs_mgr/libsnapshot/snapshot_stats.cpp
+++ b/fs_mgr/libsnapshot/snapshot_stats.cpp
@@ -91,7 +91,6 @@
 
 void SnapshotMergeStats::set_cow_file_size(uint64_t cow_file_size) {
     report_.set_cow_file_size(cow_file_size);
-    WriteState();
 }
 
 uint64_t SnapshotMergeStats::cow_file_size() {
@@ -138,6 +137,14 @@
     return report_.merge_failure_code();
 }
 
+void SnapshotMergeStats::set_source_build_fingerprint(const std::string& fingerprint) {
+    report_.set_source_build_fingerprint(fingerprint);
+}
+
+std::string SnapshotMergeStats::source_build_fingerprint() {
+    return report_.source_build_fingerprint();
+}
+
 class SnapshotMergeStatsResultImpl : public SnapshotMergeStats::Result {
   public:
     SnapshotMergeStatsResultImpl(const SnapshotMergeReport& report,
diff --git a/fs_mgr/libsnapshot/snapshot_stub.cpp b/fs_mgr/libsnapshot/snapshot_stub.cpp
index 1a9eda5..a8d5b8a 100644
--- a/fs_mgr/libsnapshot/snapshot_stub.cpp
+++ b/fs_mgr/libsnapshot/snapshot_stub.cpp
@@ -136,7 +136,10 @@
     void set_boot_complete_to_merge_start_time_ms(uint32_t) override {}
     uint32_t boot_complete_to_merge_start_time_ms() override { return 0; }
     void set_merge_failure_code(MergeFailureCode) override {}
-    MergeFailureCode merge_failure_code() { return MergeFailureCode::Ok; }
+    MergeFailureCode merge_failure_code() override { return MergeFailureCode::Ok; }
+    void set_source_build_fingerprint(const std::string&) override {}
+    std::string source_build_fingerprint() override { return {}; }
+    bool WriteState() override { return false; }
 };
 
 ISnapshotMergeStats* SnapshotManagerStub::GetSnapshotMergeStatsInstance() {
@@ -170,4 +173,9 @@
     return MergeFailureCode::Ok;
 }
 
+std::string SnapshotManagerStub::ReadSourceBuildFingerprint() {
+    LOG(ERROR) << __FUNCTION__ << " should never be called.";
+    return {};
+}
+
 }  // namespace android::snapshot
diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index 815d2bb..5c7a75d 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -146,12 +146,6 @@
         std::this_thread::sleep_for(5ms);
     }
 
-    // With the exception of boot or shutdown, system uid_ folders are always populated. Spinning
-    // here would needlessly delay most pid removals. Additionally, once empty a uid_ cgroup won't
-    // have processes hanging on it (we've already spun for all its pid_), so there's no need to
-    // spin anyway.
-    rmdir(uid_path.c_str());
-
     return ret;
 }
 
diff --git a/trusty/keymaster/keymint/TrustyKeyMintOperation.cpp b/trusty/keymaster/keymint/TrustyKeyMintOperation.cpp
index 41a21e9..9440724 100644
--- a/trusty/keymaster/keymint/TrustyKeyMintOperation.cpp
+++ b/trusty/keymaster/keymint/TrustyKeyMintOperation.cpp
@@ -34,6 +34,7 @@
 using ::keymaster::FinishOperationResponse;
 using ::keymaster::TAG_ASSOCIATED_DATA;
 using ::keymaster::TAG_AUTH_TOKEN;
+using ::keymaster::TAG_CONFIRMATION_TOKEN;
 using ::keymaster::UpdateOperationRequest;
 using ::keymaster::UpdateOperationResponse;
 using km_utils::authToken2AidlVec;
@@ -106,12 +107,12 @@
     return ScopedAStatus::ok();
 }
 
-ScopedAStatus TrustyKeyMintOperation::finish(
-        const optional<vector<uint8_t>>& input,      //
-        const optional<vector<uint8_t>>& signature,  //
-        const optional<HardwareAuthToken>& authToken,
-        const optional<TimeStampToken>& /* timestampToken */,
-        const optional<vector<uint8_t>>& /* confirmationToken */, vector<uint8_t>* output) {
+ScopedAStatus TrustyKeyMintOperation::finish(const optional<vector<uint8_t>>& input,      //
+                                             const optional<vector<uint8_t>>& signature,  //
+                                             const optional<HardwareAuthToken>& authToken,
+                                             const optional<TimeStampToken>& /* timestampToken */,
+                                             const optional<vector<uint8_t>>& confirmationToken,
+                                             vector<uint8_t>* output) {
     if (!output) {
         return ScopedAStatus(AStatus_fromServiceSpecificError(
                 static_cast<int32_t>(ErrorCode::OUTPUT_PARAMETER_NULL)));
@@ -119,6 +120,16 @@
     output->clear();
 
     FinishOperationRequest request(impl_->message_version());
+
+    if (authToken) {
+        auto tokenAsVec(authToken2AidlVec(*authToken));
+        request.additional_params.push_back(TAG_AUTH_TOKEN, tokenAsVec.data(), tokenAsVec.size());
+    }
+    if (confirmationToken) {
+        request.additional_params.push_back(TAG_CONFIRMATION_TOKEN, confirmationToken->data(),
+                                            confirmationToken->size());
+    }
+
     request.op_handle = opHandle_;
     if (signature) request.signature.Reinitialize(signature->data(), signature->size());
     size_t serialized_size = request.SerializedSize();