crash_dump: fork a copy of the target's address space.
Reduce the amount of time that a process remains paused by pausing its
threads, fetching their registers, and then performing unwinding on a
copy of its address space. This also works around a kernel change
that's in 4.9 that prevents ptrace from reading memory of processes
that we don't have immediate permissions to ptrace (even if we
previously ptraced them).
Bug: http://b/62112103
Bug: http://b/63989615
Test: treehugger
Change-Id: I7b9cc5dd8f54a354bc61f1bda0d2b7a8a55733c4
diff --git a/debuggerd/libdebuggerd/tombstone.cpp b/debuggerd/libdebuggerd/tombstone.cpp
index a0ba81b..99da801 100644
--- a/debuggerd/libdebuggerd/tombstone.cpp
+++ b/debuggerd/libdebuggerd/tombstone.cpp
@@ -35,8 +35,10 @@
#include <string>
#include <android-base/file.h>
+#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <android/log.h>
#include <backtrace/Backtrace.h>
@@ -44,169 +46,27 @@
#include <log/log.h>
#include <log/logprint.h>
#include <private/android_filesystem_config.h>
+#include <unwindstack/Memory.h>
+#include <unwindstack/Regs.h>
// Needed to get DEBUGGER_SIGNAL.
#include "debuggerd/handler.h"
#include "libdebuggerd/backtrace.h"
#include "libdebuggerd/elf_utils.h"
-#include "libdebuggerd/machine.h"
#include "libdebuggerd/open_files_list.h"
+#include "libdebuggerd/utility.h"
using android::base::GetBoolProperty;
using android::base::GetProperty;
using android::base::StringPrintf;
+using android::base::unique_fd;
+
+using unwindstack::Memory;
+using unwindstack::Regs;
#define STACK_WORDS 16
-static bool signal_has_si_addr(int si_signo, int si_code) {
- // Manually sent signals won't have si_addr.
- if (si_code == SI_USER || si_code == SI_QUEUE || si_code == SI_TKILL) {
- return false;
- }
-
- switch (si_signo) {
- case SIGBUS:
- case SIGFPE:
- case SIGILL:
- case SIGSEGV:
- case SIGTRAP:
- return true;
- default:
- return false;
- }
-}
-
-static const char* get_signame(int sig) {
- switch (sig) {
- case SIGABRT: return "SIGABRT";
- case SIGBUS: return "SIGBUS";
- case SIGFPE: return "SIGFPE";
- case SIGILL: return "SIGILL";
- case SIGSEGV: return "SIGSEGV";
-#if defined(SIGSTKFLT)
- case SIGSTKFLT: return "SIGSTKFLT";
-#endif
- case SIGSTOP: return "SIGSTOP";
- case SIGSYS: return "SIGSYS";
- case SIGTRAP: return "SIGTRAP";
- case DEBUGGER_SIGNAL: return "<debuggerd signal>";
- default: return "?";
- }
-}
-
-static const char* get_sigcode(int signo, int code) {
- // Try the signal-specific codes...
- switch (signo) {
- case SIGILL:
- switch (code) {
- case ILL_ILLOPC: return "ILL_ILLOPC";
- case ILL_ILLOPN: return "ILL_ILLOPN";
- case ILL_ILLADR: return "ILL_ILLADR";
- case ILL_ILLTRP: return "ILL_ILLTRP";
- case ILL_PRVOPC: return "ILL_PRVOPC";
- case ILL_PRVREG: return "ILL_PRVREG";
- case ILL_COPROC: return "ILL_COPROC";
- case ILL_BADSTK: return "ILL_BADSTK";
- }
- static_assert(NSIGILL == ILL_BADSTK, "missing ILL_* si_code");
- break;
- case SIGBUS:
- switch (code) {
- case BUS_ADRALN: return "BUS_ADRALN";
- case BUS_ADRERR: return "BUS_ADRERR";
- case BUS_OBJERR: return "BUS_OBJERR";
- case BUS_MCEERR_AR: return "BUS_MCEERR_AR";
- case BUS_MCEERR_AO: return "BUS_MCEERR_AO";
- }
- static_assert(NSIGBUS == BUS_MCEERR_AO, "missing BUS_* si_code");
- break;
- case SIGFPE:
- switch (code) {
- case FPE_INTDIV: return "FPE_INTDIV";
- case FPE_INTOVF: return "FPE_INTOVF";
- case FPE_FLTDIV: return "FPE_FLTDIV";
- case FPE_FLTOVF: return "FPE_FLTOVF";
- case FPE_FLTUND: return "FPE_FLTUND";
- case FPE_FLTRES: return "FPE_FLTRES";
- case FPE_FLTINV: return "FPE_FLTINV";
- case FPE_FLTSUB: return "FPE_FLTSUB";
- }
- static_assert(NSIGFPE == FPE_FLTSUB, "missing FPE_* si_code");
- break;
- case SIGSEGV:
- switch (code) {
- case SEGV_MAPERR: return "SEGV_MAPERR";
- case SEGV_ACCERR: return "SEGV_ACCERR";
-#if defined(SEGV_BNDERR)
- case SEGV_BNDERR: return "SEGV_BNDERR";
-#endif
-#if defined(SEGV_PKUERR)
- case SEGV_PKUERR: return "SEGV_PKUERR";
-#endif
- }
-#if defined(SEGV_PKUERR)
- static_assert(NSIGSEGV == SEGV_PKUERR, "missing SEGV_* si_code");
-#elif defined(SEGV_BNDERR)
- static_assert(NSIGSEGV == SEGV_BNDERR, "missing SEGV_* si_code");
-#else
- static_assert(NSIGSEGV == SEGV_ACCERR, "missing SEGV_* si_code");
-#endif
- break;
-#if defined(SYS_SECCOMP) // Our glibc is too old, and we build this for the host too.
- case SIGSYS:
- switch (code) {
- case SYS_SECCOMP: return "SYS_SECCOMP";
- }
- static_assert(NSIGSYS == SYS_SECCOMP, "missing SYS_* si_code");
- break;
-#endif
- case SIGTRAP:
- switch (code) {
- case TRAP_BRKPT: return "TRAP_BRKPT";
- case TRAP_TRACE: return "TRAP_TRACE";
- case TRAP_BRANCH: return "TRAP_BRANCH";
- case TRAP_HWBKPT: return "TRAP_HWBKPT";
- }
- if ((code & 0xff) == SIGTRAP) {
- switch ((code >> 8) & 0xff) {
- case PTRACE_EVENT_FORK:
- return "PTRACE_EVENT_FORK";
- case PTRACE_EVENT_VFORK:
- return "PTRACE_EVENT_VFORK";
- case PTRACE_EVENT_CLONE:
- return "PTRACE_EVENT_CLONE";
- case PTRACE_EVENT_EXEC:
- return "PTRACE_EVENT_EXEC";
- case PTRACE_EVENT_VFORK_DONE:
- return "PTRACE_EVENT_VFORK_DONE";
- case PTRACE_EVENT_EXIT:
- return "PTRACE_EVENT_EXIT";
- case PTRACE_EVENT_SECCOMP:
- return "PTRACE_EVENT_SECCOMP";
- case PTRACE_EVENT_STOP:
- return "PTRACE_EVENT_STOP";
- }
- }
- static_assert(NSIGTRAP == TRAP_HWBKPT, "missing TRAP_* si_code");
- break;
- }
- // Then the other codes...
- switch (code) {
- case SI_USER: return "SI_USER";
- case SI_KERNEL: return "SI_KERNEL";
- case SI_QUEUE: return "SI_QUEUE";
- case SI_TIMER: return "SI_TIMER";
- case SI_MESGQ: return "SI_MESGQ";
- case SI_ASYNCIO: return "SI_ASYNCIO";
- case SI_SIGIO: return "SI_SIGIO";
- case SI_TKILL: return "SI_TKILL";
- case SI_DETHREAD: return "SI_DETHREAD";
- }
- // Then give up...
- return "?";
-}
-
static void dump_header_info(log_t* log) {
auto fingerprint = GetProperty("ro.build.fingerprint", "unknown");
auto revision = GetProperty("ro.revision", "unknown");
@@ -216,73 +76,64 @@
_LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
}
-static void dump_probable_cause(log_t* log, const siginfo_t& si) {
+static void dump_probable_cause(log_t* log, const siginfo_t* si) {
std::string cause;
- if (si.si_signo == SIGSEGV && si.si_code == SEGV_MAPERR) {
- if (si.si_addr < reinterpret_cast<void*>(4096)) {
+ if (si->si_signo == SIGSEGV && si->si_code == SEGV_MAPERR) {
+ if (si->si_addr < reinterpret_cast<void*>(4096)) {
cause = StringPrintf("null pointer dereference");
- } else if (si.si_addr == reinterpret_cast<void*>(0xffff0ffc)) {
+ } else if (si->si_addr == reinterpret_cast<void*>(0xffff0ffc)) {
cause = "call to kuser_helper_version";
- } else if (si.si_addr == reinterpret_cast<void*>(0xffff0fe0)) {
+ } else if (si->si_addr == reinterpret_cast<void*>(0xffff0fe0)) {
cause = "call to kuser_get_tls";
- } else if (si.si_addr == reinterpret_cast<void*>(0xffff0fc0)) {
+ } else if (si->si_addr == reinterpret_cast<void*>(0xffff0fc0)) {
cause = "call to kuser_cmpxchg";
- } else if (si.si_addr == reinterpret_cast<void*>(0xffff0fa0)) {
+ } else if (si->si_addr == reinterpret_cast<void*>(0xffff0fa0)) {
cause = "call to kuser_memory_barrier";
- } else if (si.si_addr == reinterpret_cast<void*>(0xffff0f60)) {
+ } else if (si->si_addr == reinterpret_cast<void*>(0xffff0f60)) {
cause = "call to kuser_cmpxchg64";
}
- } else if (si.si_signo == SIGSYS && si.si_code == SYS_SECCOMP) {
- cause = StringPrintf("seccomp prevented call to disallowed %s system call %d",
- ABI_STRING, si.si_syscall);
+ } else if (si->si_signo == SIGSYS && si->si_code == SYS_SECCOMP) {
+ cause = StringPrintf("seccomp prevented call to disallowed %s system call %d", ABI_STRING,
+ si->si_syscall);
}
if (!cause.empty()) _LOG(log, logtype::HEADER, "Cause: %s\n", cause.c_str());
}
-static void dump_signal_info(log_t* log, const siginfo_t* siginfo) {
- const siginfo_t& si = *siginfo;
+static void dump_signal_info(log_t* log, const siginfo_t* si) {
char addr_desc[32]; // ", fault addr 0x1234"
- if (signal_has_si_addr(si.si_signo, si.si_code)) {
- snprintf(addr_desc, sizeof(addr_desc), "%p", si.si_addr);
+ if (signal_has_si_addr(si->si_signo, si->si_code)) {
+ snprintf(addr_desc, sizeof(addr_desc), "%p", si->si_addr);
} else {
snprintf(addr_desc, sizeof(addr_desc), "--------");
}
- _LOG(log, logtype::HEADER, "signal %d (%s), code %d (%s), fault addr %s\n", si.si_signo,
- get_signame(si.si_signo), si.si_code, get_sigcode(si.si_signo, si.si_code), addr_desc);
+ _LOG(log, logtype::HEADER, "signal %d (%s), code %d (%s), fault addr %s\n", si->si_signo,
+ get_signame(si->si_signo), si->si_code, get_sigcode(si->si_signo, si->si_code), addr_desc);
dump_probable_cause(log, si);
}
-static void dump_signal_info(log_t* log, pid_t tid) {
- siginfo_t si;
- memset(&si, 0, sizeof(si));
- if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) == -1) {
- ALOGE("cannot get siginfo: %s\n", strerror(errno));
- return;
- }
-
- dump_signal_info(log, &si);
-}
-
-static void dump_thread_info(log_t* log, pid_t pid, pid_t tid, const char* process_name,
- const char* thread_name) {
+static void dump_thread_info(log_t* log, const ThreadInfo& thread_info) {
// Blacklist logd, logd.reader, logd.writer, logd.auditd, logd.control ...
// TODO: Why is this controlled by thread name?
- if (strcmp(thread_name, "logd") == 0 || strncmp(thread_name, "logd.", 4) == 0) {
+ if (thread_info.thread_name == "logd" ||
+ android::base::StartsWith(thread_info.thread_name, "logd.")) {
log->should_retrieve_logcat = false;
}
- _LOG(log, logtype::HEADER, "pid: %d, tid: %d, name: %s >>> %s <<<\n", pid, tid, thread_name,
- process_name);
+ _LOG(log, logtype::HEADER, "pid: %d, tid: %d, name: %s >>> %s <<<\n", thread_info.pid,
+ thread_info.tid, thread_info.thread_name.c_str(), thread_info.process_name.c_str());
}
-static void dump_stack_segment(
- Backtrace* backtrace, log_t* log, uintptr_t* sp, size_t words, int label) {
+static void dump_stack_segment(log_t* log, BacktraceMap* backtrace_map, Memory* process_memory,
+ uintptr_t* sp, size_t words, int label) {
// Read the data all at once.
word_t stack_data[words];
- size_t bytes_read = backtrace->Read(*sp, reinterpret_cast<uint8_t*>(&stack_data[0]), sizeof(word_t) * words);
+
+ // TODO: Do we need to word align this for crashes caused by a misaligned sp?
+ // The process_vm_readv implementation of Memory should handle this appropriately?
+ size_t bytes_read = process_memory->Read(*sp, stack_data, sizeof(word_t) * words);
words = bytes_read / sizeof(word_t);
std::string line;
for (size_t i = 0; i < words; i++) {
@@ -296,11 +147,11 @@
line += StringPrintf("%" PRIPTR " %" PRIPTR, *sp, stack_data[i]);
backtrace_map_t map;
- backtrace->FillInMap(stack_data[i], &map);
+ backtrace_map->FillIn(stack_data[i], &map);
if (BacktraceMap::IsValid(map) && !map.name.empty()) {
line += " " + map.name;
uintptr_t offset = 0;
- std::string func_name(backtrace->GetFunctionName(stack_data[i], &offset, &map));
+ std::string func_name = backtrace_map->GetFunctionName(stack_data[i], &offset);
if (!func_name.empty()) {
line += " (" + func_name;
if (offset) {
@@ -315,36 +166,38 @@
}
}
-static void dump_stack(Backtrace* backtrace, log_t* log) {
+static void dump_stack(log_t* log, BacktraceMap* backtrace_map, Memory* process_memory,
+ std::vector<backtrace_frame_data_t>& frames) {
size_t first = 0, last;
- for (size_t i = 0; i < backtrace->NumFrames(); i++) {
- const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
- if (frame->sp) {
+ for (size_t i = 0; i < frames.size(); i++) {
+ const backtrace_frame_data_t& frame = frames[i];
+ if (frame.sp) {
if (!first) {
first = i+1;
}
last = i;
}
}
+
if (!first) {
return;
}
first--;
// Dump a few words before the first frame.
- word_t sp = backtrace->GetFrame(first)->sp - STACK_WORDS * sizeof(word_t);
- dump_stack_segment(backtrace, log, &sp, STACK_WORDS, -1);
+ word_t sp = frames[first].sp - STACK_WORDS * sizeof(word_t);
+ dump_stack_segment(log, backtrace_map, process_memory, &sp, STACK_WORDS, -1);
// Dump a few words from all successive frames.
// Only log the first 3 frames, put the rest in the tombstone.
for (size_t i = first; i <= last; i++) {
- const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
+ const backtrace_frame_data_t* frame = &frames[i];
if (sp != frame->sp) {
_LOG(log, logtype::STACK, " ........ ........\n");
sp = frame->sp;
}
if (i == last) {
- dump_stack_segment(backtrace, log, &sp, STACK_WORDS, i);
+ dump_stack_segment(log, backtrace_map, process_memory, &sp, STACK_WORDS, i);
if (sp < frame->sp + frame->stack_size) {
_LOG(log, logtype::STACK, " ........ ........\n");
}
@@ -355,7 +208,7 @@
} else if (words > STACK_WORDS) {
words = STACK_WORDS;
}
- dump_stack_segment(backtrace, log, &sp, words, i);
+ dump_stack_segment(log, backtrace_map, process_memory, &sp, words, i);
}
}
}
@@ -372,44 +225,34 @@
return addr_str;
}
-static void dump_abort_message(Backtrace* backtrace, log_t* log, uintptr_t address) {
+static void dump_abort_message(log_t* log, Memory* process_memory, uintptr_t address) {
if (address == 0) {
return;
}
- address += sizeof(size_t); // Skip the buffer length.
+ size_t length;
+ if (!process_memory->ReadFully(address, &length, sizeof(length))) {
+ _LOG(log, logtype::HEADER, "Failed to read abort message header: %s\n", strerror(errno));
+ return;
+ }
char msg[512];
- memset(msg, 0, sizeof(msg));
- char* p = &msg[0];
- while (p < &msg[sizeof(msg)]) {
- word_t data;
- size_t len = sizeof(word_t);
- if (!backtrace->ReadWord(address, &data)) {
- break;
- }
- address += sizeof(word_t);
-
- while (len > 0 && (*p++ = (data >> (sizeof(word_t) - len) * 8) & 0xff) != 0) {
- len--;
- }
+ if (length >= sizeof(msg)) {
+ _LOG(log, logtype::HEADER, "Abort message too long: claimed length = %zd\n", length);
+ return;
}
- msg[sizeof(msg) - 1] = '\0';
+ if (!process_memory->ReadFully(address + sizeof(length), msg, length)) {
+ _LOG(log, logtype::HEADER, "Failed to read abort message: %s\n", strerror(errno));
+ return;
+ }
+
+ msg[length] = '\0';
_LOG(log, logtype::HEADER, "Abort message: '%s'\n", msg);
}
-static void dump_all_maps(Backtrace* backtrace, BacktraceMap* map, log_t* log, pid_t tid) {
- bool print_fault_address_marker = false;
- uintptr_t addr = 0;
- siginfo_t si;
- memset(&si, 0, sizeof(si));
- if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) != -1) {
- print_fault_address_marker = signal_has_si_addr(si.si_signo, si.si_code);
- addr = reinterpret_cast<uintptr_t>(si.si_addr);
- } else {
- ALOGE("Cannot get siginfo for %d: %s\n", tid, strerror(errno));
- }
+static void dump_all_maps(log_t* log, BacktraceMap* map, Memory* process_memory, uintptr_t addr) {
+ bool print_fault_address_marker = addr;
ScopedBacktraceMapIteratorLock lock(map);
_LOG(log, logtype::MAPS,
@@ -464,7 +307,7 @@
space_needed = false;
line += " " + entry->name;
std::string build_id;
- if ((entry->flags & PROT_READ) && elf_get_build_id(backtrace, entry->start, &build_id)) {
+ if ((entry->flags & PROT_READ) && elf_get_build_id(process_memory, entry->start, &build_id)) {
line += " (BuildId: " + build_id + ")";
}
}
@@ -482,50 +325,117 @@
}
}
-static void dump_backtrace_and_stack(Backtrace* backtrace, log_t* log) {
- if (backtrace->NumFrames()) {
- _LOG(log, logtype::BACKTRACE, "\nbacktrace:\n");
- dump_backtrace_to_log(backtrace, log, " ");
-
- _LOG(log, logtype::STACK, "\nstack:\n");
- dump_stack(backtrace, log);
+void dump_backtrace(log_t* log, std::vector<backtrace_frame_data_t>& frames, const char* prefix) {
+ for (auto& frame : frames) {
+ _LOG(log, logtype::BACKTRACE, "%s%s\n", prefix, Backtrace::FormatFrameData(&frame).c_str());
}
}
-// Weak noop implementation, real implementations are in <arch>/machine.cpp.
-__attribute__((weak)) void dump_registers(log_t* log, const ucontext_t*) {
- _LOG(log, logtype::REGISTERS, " register dumping unimplemented on this architecture");
+static void print_register_row(log_t* log,
+ const std::vector<std::pair<std::string, uint64_t>>& registers) {
+ std::string output;
+ for (auto& [name, value] : registers) {
+ output += android::base::StringPrintf(" %-3s %0*" PRIxPTR, name.c_str(),
+ static_cast<int>(2 * sizeof(void*)),
+ static_cast<uintptr_t>(value));
+ }
+
+ _LOG(log, logtype::REGISTERS, " %s\n", output.c_str());
}
-static void dump_thread(log_t* log, pid_t pid, pid_t tid, const std::string& process_name,
- const std::string& thread_name, BacktraceMap* map,
- uintptr_t abort_msg_address, bool primary_thread) {
- log->current_tid = tid;
+void dump_registers(log_t* log, Regs* regs) {
+ // Split lr/sp/pc into their own special row.
+ static constexpr size_t column_count = 4;
+ std::vector<std::pair<std::string, uint64_t>> current_row;
+ std::vector<std::pair<std::string, uint64_t>> special_row;
+
+#if defined(__arm__) || defined(__aarch64__)
+ static constexpr const char* special_registers[] = {"ip", "lr", "sp", "pc"};
+#elif defined(__i386__)
+ static constexpr const char* special_registers[] = {"ebp", "esp", "eip"};
+#elif defined(__x86_64__)
+ static constexpr const char* special_registers[] = {"rbp", "rsp", "rip"};
+#else
+ static constexpr const char* special_registers[] = {};
+#endif
+
+ regs->IterateRegisters([log, ¤t_row, &special_row](const char* name, uint64_t value) {
+ auto row = ¤t_row;
+ for (const char* special_name : special_registers) {
+ if (strcmp(special_name, name) == 0) {
+ row = &special_row;
+ break;
+ }
+ }
+
+ row->emplace_back(name, value);
+ if (current_row.size() == column_count) {
+ print_register_row(log, current_row);
+ current_row.clear();
+ }
+ });
+
+ if (!current_row.empty()) {
+ print_register_row(log, current_row);
+ }
+
+ print_register_row(log, special_row);
+}
+
+void dump_memory_and_code(log_t* log, Memory* memory, Regs* regs) {
+ regs->IterateRegisters([log, memory](const char* name, uint64_t value) {
+ dump_memory(log, memory, value, "memory near %s:", name);
+ });
+}
+
+static bool dump_thread(log_t* log, BacktraceMap* map, Memory* process_memory,
+ const ThreadInfo& thread_info, uintptr_t abort_msg_address,
+ bool primary_thread) {
+ UNUSED(process_memory);
+ log->current_tid = thread_info.tid;
if (!primary_thread) {
_LOG(log, logtype::THREAD, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
}
- dump_thread_info(log, pid, tid, process_name.c_str(), thread_name.c_str());
- dump_signal_info(log, tid);
+ dump_thread_info(log, thread_info);
- std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
- if (primary_thread) {
- dump_abort_message(backtrace.get(), log, abort_msg_address);
+ if (thread_info.siginfo) {
+ dump_signal_info(log, thread_info.siginfo);
}
- dump_registers(log, tid);
- if (backtrace->Unwind(0)) {
- dump_backtrace_and_stack(backtrace.get(), log);
- } else {
- ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
+
+ dump_registers(log, thread_info.registers.get());
+
+ std::vector<backtrace_frame_data_t> frames;
+ if (!Backtrace::Unwind(thread_info.registers.get(), map, &frames, 0, nullptr)) {
+ _LOG(log, logtype::THREAD, "Failed to unwind");
+ return false;
+ }
+
+ if (!frames.empty()) {
+ _LOG(log, logtype::BACKTRACE, "\nbacktrace:\n");
+ dump_backtrace(log, frames, " ");
+
+ _LOG(log, logtype::STACK, "\nstack:\n");
+ dump_stack(log, map, process_memory, frames);
}
if (primary_thread) {
- dump_memory_and_code(log, backtrace.get());
+ dump_abort_message(log, process_memory, abort_msg_address);
+ }
+
+ if (primary_thread) {
+ dump_memory_and_code(log, process_memory, thread_info.registers.get());
if (map) {
- dump_all_maps(backtrace.get(), map, log, tid);
+ uintptr_t addr = 0;
+ siginfo_t* si = thread_info.siginfo;
+ if (signal_has_si_addr(si->si_signo, si->si_code)) {
+ addr = reinterpret_cast<uintptr_t>(si->si_addr);
+ }
+ dump_all_maps(log, map, process_memory, addr);
}
}
log->current_tid = log->crashed_tid;
+ return true;
}
// Reads the contents of the specified log device, filters out the entries
@@ -534,8 +444,7 @@
// If "tail" is non-zero, log the last "tail" number of lines.
static EventTagMap* g_eventTagMap = NULL;
-static void dump_log_file(
- log_t* log, pid_t pid, const char* filename, unsigned int tail) {
+static void dump_log_file(log_t* log, pid_t pid, const char* filename, unsigned int tail) {
bool first = true;
struct logger_list* logger_list;
@@ -654,56 +563,15 @@
// Dumps the logs generated by the specified pid to the tombstone, from both
// "system" and "main" log devices. Ideally we'd interleave the output.
static void dump_logs(log_t* log, pid_t pid, unsigned int tail) {
+ if (pid == getpid()) {
+ // Cowardly refuse to dump logs while we're running in-process.
+ return;
+ }
+
dump_log_file(log, pid, "system", tail);
dump_log_file(log, pid, "main", tail);
}
-// Dumps all information about the specified pid to the tombstone.
-static void dump_crash(log_t* log, BacktraceMap* map, const OpenFilesList* open_files, pid_t pid,
- pid_t tid, const std::string& process_name,
- const std::map<pid_t, std::string>& threads, uintptr_t abort_msg_address) {
- // don't copy log messages to tombstone unless this is a dev device
- bool want_logs = GetBoolProperty("ro.debuggable", false);
-
- _LOG(log, logtype::HEADER,
- "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
- dump_header_info(log);
- dump_thread(log, pid, tid, process_name, threads.find(tid)->second, map, abort_msg_address, true);
- if (want_logs) {
- dump_logs(log, pid, 5);
- }
-
- for (const auto& it : threads) {
- pid_t thread_tid = it.first;
- const std::string& thread_name = it.second;
-
- if (thread_tid != tid) {
- dump_thread(log, pid, thread_tid, process_name, thread_name, map, 0, false);
- }
- }
-
- if (open_files) {
- _LOG(log, logtype::OPEN_FILES, "\nopen files:\n");
- dump_open_files_list_to_log(*open_files, log, " ");
- }
-
- if (want_logs) {
- dump_logs(log, pid, 0);
- }
-}
-
-void engrave_tombstone(int tombstone_fd, BacktraceMap* map, const OpenFilesList* open_files,
- pid_t pid, pid_t tid, const std::string& process_name,
- const std::map<pid_t, std::string>& threads, uintptr_t abort_msg_address,
- std::string* amfd_data) {
- log_t log;
- log.current_tid = tid;
- log.crashed_tid = tid;
- log.tfd = tombstone_fd;
- log.amfd_data = amfd_data;
- dump_crash(&log, map, open_files, pid, tid, process_name, threads, abort_msg_address);
-}
-
void engrave_tombstone_ucontext(int tombstone_fd, uintptr_t abort_msg_address, siginfo_t* siginfo,
ucontext_t* ucontext) {
pid_t pid = getpid();
@@ -721,31 +589,69 @@
read_with_default("/proc/self/comm", thread_name, sizeof(thread_name), "<unknown>");
read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");
- _LOG(&log, logtype::HEADER, "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
- dump_header_info(&log);
- dump_thread_info(&log, pid, tid, thread_name, process_name);
- dump_signal_info(&log, siginfo);
+ std::unique_ptr<Regs> regs(Regs::CreateFromUcontext(Regs::CurrentArch(), ucontext));
- std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid));
- dump_abort_message(backtrace.get(), &log, abort_msg_address);
- dump_registers(&log, ucontext);
+ std::map<pid_t, ThreadInfo> threads;
+ threads[gettid()] = ThreadInfo{
+ .registers = std::move(regs),
+ .tid = tid,
+ .thread_name = thread_name,
+ .pid = pid,
+ .process_name = process_name,
+ .siginfo = siginfo,
+ };
- if (backtrace->Unwind(0, ucontext)) {
- dump_backtrace_and_stack(backtrace.get(), &log);
- } else {
- ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
+ std::unique_ptr<BacktraceMap> backtrace_map(BacktraceMap::Create(getpid(), false));
+ if (!backtrace_map) {
+ ALOGE("failed to create backtrace map");
+ _exit(1);
}
- // TODO: Make this match the format of dump_all_maps above.
- _LOG(&log, logtype::MAPS, "memory map:\n");
- android::base::unique_fd maps_fd(open("/proc/self/maps", O_RDONLY | O_CLOEXEC));
- if (maps_fd == -1) {
- _LOG(&log, logtype::MAPS, " failed to open /proc/self/maps: %s", strerror(errno));
- } else {
- char buf[256];
- ssize_t rc;
- while ((rc = TEMP_FAILURE_RETRY(read(maps_fd.get(), buf, sizeof(buf)))) > 0) {
- android::base::WriteFully(tombstone_fd, buf, rc);
+ std::shared_ptr<Memory> process_memory = backtrace_map->GetProcessMemory();
+ engrave_tombstone(unique_fd(dup(tombstone_fd)), backtrace_map.get(), process_memory.get(),
+ threads, tid, abort_msg_address, nullptr, nullptr);
+}
+
+void engrave_tombstone(unique_fd output_fd, BacktraceMap* map, Memory* process_memory,
+ const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
+ uintptr_t abort_msg_address, OpenFilesList* open_files,
+ std::string* amfd_data) {
+ // don't copy log messages to tombstone unless this is a dev device
+ bool want_logs = android::base::GetBoolProperty("ro.debuggable", false);
+
+ log_t log;
+ log.current_tid = target_thread;
+ log.crashed_tid = target_thread;
+ log.tfd = output_fd.get();
+ log.amfd_data = amfd_data;
+
+ _LOG(&log, logtype::HEADER, "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
+ dump_header_info(&log);
+
+ auto it = threads.find(target_thread);
+ if (it == threads.end()) {
+ LOG(FATAL) << "failed to find target thread";
+ }
+ dump_thread(&log, map, process_memory, it->second, abort_msg_address, true);
+
+ if (want_logs) {
+ dump_logs(&log, it->second.pid, 5);
+ }
+
+ for (auto& [tid, thread_info] : threads) {
+ if (tid == target_thread) {
+ continue;
}
+
+ dump_thread(&log, map, process_memory, thread_info, 0, false);
+ }
+
+ if (open_files) {
+ _LOG(&log, logtype::OPEN_FILES, "\nopen files:\n");
+ dump_open_files_list(&log, *open_files, " ");
+ }
+
+ if (want_logs) {
+ dump_logs(&log, it->second.pid, 0);
}
}