2 * Copyright (C) 2012-2014 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #define LOG_TAG "DEBUG"
19 #include <arpa/inet.h>
30 #include <sys/ptrace.h>
31 #include <sys/socket.h>
38 #include <private/android_filesystem_config.h>
40 #include <base/stringprintf.h>
41 #include <cutils/properties.h>
43 #include <log/logger.h>
44 #include <log/logprint.h>
46 #include <backtrace/Backtrace.h>
47 #include <backtrace/BacktraceMap.h>
49 #include <selinux/android.h>
51 #include "backtrace.h"
52 #include "elf_utils.h"
54 #include "tombstone.h"
56 #define STACK_WORDS 16
58 #define MAX_TOMBSTONES 10
59 #define TOMBSTONE_DIR "/data/tombstones"
60 #define TOMBSTONE_TEMPLATE (TOMBSTONE_DIR"/tombstone_%02d")
62 // Must match the path defined in NativeCrashListener.java
63 #define NCRASH_SOCKET_PATH "/data/system/ndebugsocket"
65 static bool signal_has_si_addr(int sig) {
78 static const char* get_signame(int sig) {
80 case SIGABRT: return "SIGABRT";
81 case SIGBUS: return "SIGBUS";
82 case SIGFPE: return "SIGFPE";
83 case SIGILL: return "SIGILL";
84 case SIGPIPE: return "SIGPIPE";
85 case SIGSEGV: return "SIGSEGV";
86 #if defined(SIGSTKFLT)
87 case SIGSTKFLT: return "SIGSTKFLT";
89 case SIGSTOP: return "SIGSTOP";
90 case SIGTRAP: return "SIGTRAP";
95 static const char* get_sigcode(int signo, int code) {
96 // Try the signal-specific codes...
100 case ILL_ILLOPC: return "ILL_ILLOPC";
101 case ILL_ILLOPN: return "ILL_ILLOPN";
102 case ILL_ILLADR: return "ILL_ILLADR";
103 case ILL_ILLTRP: return "ILL_ILLTRP";
104 case ILL_PRVOPC: return "ILL_PRVOPC";
105 case ILL_PRVREG: return "ILL_PRVREG";
106 case ILL_COPROC: return "ILL_COPROC";
107 case ILL_BADSTK: return "ILL_BADSTK";
109 static_assert(NSIGILL == ILL_BADSTK, "missing ILL_* si_code");
113 case BUS_ADRALN: return "BUS_ADRALN";
114 case BUS_ADRERR: return "BUS_ADRERR";
115 case BUS_OBJERR: return "BUS_OBJERR";
116 case BUS_MCEERR_AR: return "BUS_MCEERR_AR";
117 case BUS_MCEERR_AO: return "BUS_MCEERR_AO";
119 static_assert(NSIGBUS == BUS_MCEERR_AO, "missing BUS_* si_code");
123 case FPE_INTDIV: return "FPE_INTDIV";
124 case FPE_INTOVF: return "FPE_INTOVF";
125 case FPE_FLTDIV: return "FPE_FLTDIV";
126 case FPE_FLTOVF: return "FPE_FLTOVF";
127 case FPE_FLTUND: return "FPE_FLTUND";
128 case FPE_FLTRES: return "FPE_FLTRES";
129 case FPE_FLTINV: return "FPE_FLTINV";
130 case FPE_FLTSUB: return "FPE_FLTSUB";
132 static_assert(NSIGFPE == FPE_FLTSUB, "missing FPE_* si_code");
136 case SEGV_MAPERR: return "SEGV_MAPERR";
137 case SEGV_ACCERR: return "SEGV_ACCERR";
139 static_assert(NSIGSEGV == SEGV_ACCERR, "missing SEGV_* si_code");
143 case TRAP_BRKPT: return "TRAP_BRKPT";
144 case TRAP_TRACE: return "TRAP_TRACE";
145 case TRAP_BRANCH: return "TRAP_BRANCH";
146 case TRAP_HWBKPT: return "TRAP_HWBKPT";
148 static_assert(NSIGTRAP == TRAP_HWBKPT, "missing TRAP_* si_code");
151 // Then the other codes...
153 case SI_USER: return "SI_USER";
154 case SI_KERNEL: return "SI_KERNEL";
155 case SI_QUEUE: return "SI_QUEUE";
156 case SI_TIMER: return "SI_TIMER";
157 case SI_MESGQ: return "SI_MESGQ";
158 case SI_ASYNCIO: return "SI_ASYNCIO";
159 case SI_SIGIO: return "SI_SIGIO";
160 case SI_TKILL: return "SI_TKILL";
161 case SI_DETHREAD: return "SI_DETHREAD";
167 static void dump_header_info(log_t* log) {
168 char fingerprint[PROPERTY_VALUE_MAX];
169 char revision[PROPERTY_VALUE_MAX];
171 property_get("ro.build.fingerprint", fingerprint, "unknown");
172 property_get("ro.revision", revision, "unknown");
174 _LOG(log, logtype::HEADER, "Build fingerprint: '%s'\n", fingerprint);
175 _LOG(log, logtype::HEADER, "Revision: '%s'\n", revision);
176 _LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
179 static void dump_signal_info(log_t* log, pid_t tid, int signal, int si_code) {
181 memset(&si, 0, sizeof(si));
182 if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) == -1) {
183 _LOG(log, logtype::HEADER, "cannot get siginfo: %s\n", strerror(errno));
187 // bionic has to re-raise some signals, which overwrites the si_code with SI_TKILL.
188 si.si_code = si_code;
190 char addr_desc[32]; // ", fault addr 0x1234"
191 if (signal_has_si_addr(signal)) {
192 snprintf(addr_desc, sizeof(addr_desc), "%p", si.si_addr);
194 snprintf(addr_desc, sizeof(addr_desc), "--------");
197 _LOG(log, logtype::HEADER, "signal %d (%s), code %d (%s), fault addr %s\n",
198 signal, get_signame(signal), si.si_code, get_sigcode(signal, si.si_code), addr_desc);
201 static void dump_thread_info(log_t* log, pid_t pid, pid_t tid) {
203 char threadnamebuf[1024];
204 char* threadname = NULL;
207 snprintf(path, sizeof(path), "/proc/%d/comm", tid);
208 if ((fp = fopen(path, "r"))) {
209 threadname = fgets(threadnamebuf, sizeof(threadnamebuf), fp);
212 size_t len = strlen(threadname);
213 if (len && threadname[len - 1] == '\n') {
214 threadname[len - 1] = '\0';
218 // Blacklist logd, logd.reader, logd.writer, logd.auditd, logd.control ...
219 static const char logd[] = "logd";
220 if (!strncmp(threadname, logd, sizeof(logd) - 1)
221 && (!threadname[sizeof(logd) - 1] || (threadname[sizeof(logd) - 1] == '.'))) {
222 log->should_retrieve_logcat = false;
225 char procnamebuf[1024];
226 char* procname = NULL;
228 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
229 if ((fp = fopen(path, "r"))) {
230 procname = fgets(procnamebuf, sizeof(procnamebuf), fp);
234 _LOG(log, logtype::HEADER, "pid: %d, tid: %d, name: %s >>> %s <<<\n", pid, tid,
235 threadname ? threadname : "UNKNOWN", procname ? procname : "UNKNOWN");
238 static void dump_stack_segment(
239 Backtrace* backtrace, log_t* log, uintptr_t* sp, size_t words, int label) {
240 // Read the data all at once.
241 word_t stack_data[words];
242 size_t bytes_read = backtrace->Read(*sp, reinterpret_cast<uint8_t*>(&stack_data[0]), sizeof(word_t) * words);
243 words = bytes_read / sizeof(word_t);
245 for (size_t i = 0; i < words; i++) {
247 if (i == 0 && label >= 0) {
248 // Print the label once.
249 line += android::base::StringPrintf("#%02d ", label);
253 line += android::base::StringPrintf("%" PRIPTR " %" PRIPTR, *sp, stack_data[i]);
256 backtrace->FillInMap(stack_data[i], &map);
257 if (BacktraceMap::IsValid(map) && !map.name.empty()) {
258 line += " " + map.name;
259 uintptr_t offset = 0;
260 std::string func_name(backtrace->GetFunctionName(stack_data[i], &offset));
261 if (!func_name.empty()) {
262 line += " (" + func_name;
264 line += android::base::StringPrintf("+%" PRIuPTR, offset);
269 _LOG(log, logtype::STACK, "%s\n", line.c_str());
271 *sp += sizeof(word_t);
275 static void dump_stack(Backtrace* backtrace, log_t* log) {
276 size_t first = 0, last;
277 for (size_t i = 0; i < backtrace->NumFrames(); i++) {
278 const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
291 // Dump a few words before the first frame.
292 word_t sp = backtrace->GetFrame(first)->sp - STACK_WORDS * sizeof(word_t);
293 dump_stack_segment(backtrace, log, &sp, STACK_WORDS, -1);
295 // Dump a few words from all successive frames.
296 // Only log the first 3 frames, put the rest in the tombstone.
297 for (size_t i = first; i <= last; i++) {
298 const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
299 if (sp != frame->sp) {
300 _LOG(log, logtype::STACK, " ........ ........\n");
304 dump_stack_segment(backtrace, log, &sp, STACK_WORDS, i);
305 if (sp < frame->sp + frame->stack_size) {
306 _LOG(log, logtype::STACK, " ........ ........\n");
309 size_t words = frame->stack_size / sizeof(word_t);
312 } else if (words > STACK_WORDS) {
315 dump_stack_segment(backtrace, log, &sp, words, i);
320 static std::string get_addr_string(uintptr_t addr) {
321 std::string addr_str;
322 #if defined(__LP64__)
323 addr_str = android::base::StringPrintf("%08x'%08x",
324 static_cast<uint32_t>(addr >> 32),
325 static_cast<uint32_t>(addr & 0xffffffff));
327 addr_str = android::base::StringPrintf("%08x", addr);
332 static void dump_all_maps(Backtrace* backtrace, BacktraceMap* map, log_t* log, pid_t tid) {
333 bool print_fault_address_marker = false;
336 memset(&si, 0, sizeof(si));
337 if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) != -1) {
338 print_fault_address_marker = signal_has_si_addr(si.si_signo);
339 addr = reinterpret_cast<uintptr_t>(si.si_addr);
341 _LOG(log, logtype::ERROR, "Cannot get siginfo for %d: %s\n", tid, strerror(errno));
344 _LOG(log, logtype::MAPS, "\n");
345 if (!print_fault_address_marker) {
346 _LOG(log, logtype::MAPS, "memory map:\n");
348 _LOG(log, logtype::MAPS, "memory map: (fault address prefixed with --->)\n");
349 if (map->begin() != map->end() && addr < map->begin()->start) {
350 _LOG(log, logtype::MAPS, "--->Fault address falls at %s before any mapped regions\n",
351 get_addr_string(addr).c_str());
352 print_fault_address_marker = false;
357 for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) {
359 if (print_fault_address_marker) {
360 if (addr < it->start) {
361 _LOG(log, logtype::MAPS, "--->Fault address falls at %s between mapped regions\n",
362 get_addr_string(addr).c_str());
363 print_fault_address_marker = false;
364 } else if (addr >= it->start && addr < it->end) {
366 print_fault_address_marker = false;
369 line += get_addr_string(it->start) + '-' + get_addr_string(it->end - 1) + ' ';
370 if (it->flags & PROT_READ) {
375 if (it->flags & PROT_WRITE) {
380 if (it->flags & PROT_EXEC) {
385 line += android::base::StringPrintf(" %8" PRIxPTR " %8" PRIxPTR,
386 it->offset, it->end - it->start);
387 bool space_needed = true;
388 if (it->name.length() > 0) {
389 space_needed = false;
390 line += " " + it->name;
391 std::string build_id;
392 if ((it->flags & PROT_READ) && elf_get_build_id(backtrace, it->start, &build_id)) {
393 line += " (BuildId: " + build_id + ")";
396 if (it->load_base != 0) {
400 line += android::base::StringPrintf(" (load base 0x%" PRIxPTR ")", it->load_base);
402 _LOG(log, logtype::MAPS, "%s\n", line.c_str());
404 if (print_fault_address_marker) {
405 _LOG(log, logtype::MAPS, "--->Fault address falls at %s after any mapped regions\n",
406 get_addr_string(addr).c_str());
410 static void dump_backtrace_and_stack(Backtrace* backtrace, log_t* log) {
411 if (backtrace->NumFrames()) {
412 _LOG(log, logtype::BACKTRACE, "\nbacktrace:\n");
413 dump_backtrace_to_log(backtrace, log, " ");
415 _LOG(log, logtype::STACK, "\nstack:\n");
416 dump_stack(backtrace, log);
420 // Return true if some thread is not detached cleanly
421 static bool dump_sibling_thread_report(
422 log_t* log, pid_t pid, pid_t tid, int* total_sleep_time_usec, BacktraceMap* map) {
425 snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
427 DIR* d = opendir(task_path);
428 // Bail early if the task directory cannot be opened
430 ALOGE("Cannot open /proc/%d/task\n", pid);
434 bool detach_failed = false;
436 while ((de = readdir(d)) != NULL) {
437 // Ignore "." and ".."
438 if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
442 // The main thread at fault has been handled individually
444 pid_t new_tid = strtoul(de->d_name, &end, 10);
445 if (*end || new_tid == tid) {
449 // Skip this thread if cannot ptrace it
450 if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0) {
451 _LOG(log, logtype::ERROR, "ptrace attach to %d failed: %s\n", new_tid, strerror(errno));
455 if (wait_for_sigstop(new_tid, total_sleep_time_usec, &detach_failed) == -1) {
459 log->current_tid = new_tid;
460 _LOG(log, logtype::THREAD, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
461 dump_thread_info(log, pid, new_tid);
463 dump_registers(log, new_tid);
464 std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, new_tid, map));
465 if (backtrace->Unwind(0)) {
466 dump_backtrace_and_stack(backtrace.get(), log);
468 ALOGE("Unwind of sibling failed: pid = %d, tid = %d", pid, new_tid);
471 log->current_tid = log->crashed_tid;
473 if (ptrace(PTRACE_DETACH, new_tid, 0, 0) != 0) {
474 _LOG(log, logtype::ERROR, "ptrace detach from %d failed: %s\n", new_tid, strerror(errno));
475 detach_failed = true;
480 return detach_failed;
483 // Reads the contents of the specified log device, filters out the entries
484 // that don't match the specified pid, and writes them to the tombstone file.
486 // If "tail" is non-zero, log the last "tail" number of lines.
487 static EventTagMap* g_eventTagMap = NULL;
489 static void dump_log_file(
490 log_t* log, pid_t pid, const char* filename, unsigned int tail) {
492 struct logger_list* logger_list;
494 if (!log->should_retrieve_logcat) {
498 logger_list = android_logger_list_open(
499 android_name_to_log_id(filename), ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, tail, pid);
502 ALOGE("Unable to open %s: %s\n", filename, strerror(errno));
506 struct log_msg log_entry;
509 ssize_t actual = android_logger_list_read(logger_list, &log_entry);
510 struct logger_entry* entry;
513 if (actual == -EINTR) {
514 // interrupted by signal, retry
516 } else if (actual == -EAGAIN) {
517 // non-blocking EOF; we're done
520 _LOG(log, logtype::ERROR, "Error while reading log: %s\n",
524 } else if (actual == 0) {
525 _LOG(log, logtype::ERROR, "Got zero bytes while reading log: %s\n",
530 // NOTE: if you ALOGV something here, this will spin forever,
531 // because you will be writing as fast as you're reading. Any
532 // high-frequency debug diagnostics should just be written to
533 // the tombstone file.
535 entry = &log_entry.entry_v1;
538 _LOG(log, logtype::LOGS, "--------- %slog %s\n",
539 tail ? "tail end of " : "", filename);
543 // Msg format is: <priority:1><tag:N>\0<message:N>\0
545 // We want to display it in the same format as "logcat -v threadtime"
546 // (although in this case the pid is redundant).
547 static const char* kPrioChars = "!.VDIWEFS";
548 unsigned hdr_size = log_entry.entry.hdr_size;
550 hdr_size = sizeof(log_entry.entry_v1);
552 char* msg = reinterpret_cast<char*>(log_entry.buf) + hdr_size;
555 time_t sec = static_cast<time_t>(entry->sec);
558 ptm = localtime_r(&sec, &tmBuf);
559 strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm);
561 if (log_entry.id() == LOG_ID_EVENTS) {
562 if (!g_eventTagMap) {
563 g_eventTagMap = android_openEventTagMap(EVENT_TAG_MAP_FILE);
567 android_log_processBinaryLogBuffer(entry, &e, g_eventTagMap, buf, sizeof(buf));
568 _LOG(log, logtype::LOGS, "%s.%03d %5d %5d %c %-8s: %s\n",
569 timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
570 'I', e.tag, e.message);
574 unsigned char prio = msg[0];
576 msg = tag + strlen(tag) + 1;
578 // consume any trailing newlines
579 char* nl = msg + strlen(msg) - 1;
580 while (nl >= msg && *nl == '\n') {
584 char prioChar = (prio < strlen(kPrioChars) ? kPrioChars[prio] : '?');
586 // Look for line breaks ('\n') and display each text line
587 // on a separate line, prefixed with the header, like logcat does.
589 nl = strchr(msg, '\n');
595 _LOG(log, logtype::LOGS, "%s.%03d %5d %5d %c %-8s: %s\n",
596 timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
598 } while ((msg = nl));
601 android_logger_list_free(logger_list);
604 // Dumps the logs generated by the specified pid to the tombstone, from both
605 // "system" and "main" log devices. Ideally we'd interleave the output.
606 static void dump_logs(log_t* log, pid_t pid, unsigned int tail) {
607 dump_log_file(log, pid, "system", tail);
608 dump_log_file(log, pid, "main", tail);
611 static void dump_abort_message(Backtrace* backtrace, log_t* log, uintptr_t address) {
616 address += sizeof(size_t); // Skip the buffer length.
619 memset(msg, 0, sizeof(msg));
621 while (p < &msg[sizeof(msg)]) {
623 size_t len = sizeof(word_t);
624 if (!backtrace->ReadWord(address, &data)) {
627 address += sizeof(word_t);
629 while (len > 0 && (*p++ = (data >> (sizeof(word_t) - len) * 8) & 0xff) != 0)
632 msg[sizeof(msg) - 1] = '\0';
634 _LOG(log, logtype::HEADER, "Abort message: '%s'\n", msg);
637 // Dumps all information about the specified pid to the tombstone.
638 static bool dump_crash(log_t* log, pid_t pid, pid_t tid, int signal, int si_code,
639 uintptr_t abort_msg_address, bool dump_sibling_threads,
640 int* total_sleep_time_usec) {
641 // don't copy log messages to tombstone unless this is a dev device
642 char value[PROPERTY_VALUE_MAX];
643 property_get("ro.debuggable", value, "0");
644 bool want_logs = (value[0] == '1');
646 if (log->amfd >= 0) {
647 // Activity Manager protocol: binary 32-bit network-byte-order ints for the
648 // pid and signal number, followed by the raw text of the dump, culminating
649 // in a zero byte that marks end-of-data.
650 uint32_t datum = htonl(pid);
651 TEMP_FAILURE_RETRY( write(log->amfd, &datum, 4) );
652 datum = htonl(signal);
653 TEMP_FAILURE_RETRY( write(log->amfd, &datum, 4) );
656 _LOG(log, logtype::HEADER,
657 "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
658 dump_header_info(log);
659 dump_thread_info(log, pid, tid);
662 dump_signal_info(log, tid, signal, si_code);
665 std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(pid));
666 std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map.get()));
667 dump_abort_message(backtrace.get(), log, abort_msg_address);
668 dump_registers(log, tid);
669 if (backtrace->Unwind(0)) {
670 dump_backtrace_and_stack(backtrace.get(), log);
672 ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
674 dump_memory_and_code(log, backtrace.get());
675 if (map.get() != nullptr) {
676 dump_all_maps(backtrace.get(), map.get(), log, tid);
680 dump_logs(log, pid, 5);
683 bool detach_failed = false;
684 if (dump_sibling_threads) {
685 detach_failed = dump_sibling_thread_report(log, pid, tid, total_sleep_time_usec, map.get());
689 dump_logs(log, pid, 0);
692 // send EOD to the Activity Manager, then wait for its ack to avoid racing ahead
693 // and killing the target out from under it
694 if (log->amfd >= 0) {
695 uint8_t eodMarker = 0;
696 TEMP_FAILURE_RETRY( write(log->amfd, &eodMarker, 1) );
697 // 3 sec timeout reading the ack; we're fine if that happens
698 TEMP_FAILURE_RETRY( read(log->amfd, &eodMarker, 1) );
701 return detach_failed;
704 // find_and_open_tombstone - find an available tombstone slot, if any, of the
705 // form tombstone_XX where XX is 00 to MAX_TOMBSTONES-1, inclusive. If no
706 // file is available, we reuse the least-recently-modified file.
708 // Returns the path of the tombstone file, allocated using malloc(). Caller must free() it.
709 static char* find_and_open_tombstone(int* fd) {
710 // In a single pass, find an available slot and, in case none
711 // exist, find and record the least-recently-modified file.
714 struct stat oldest_sb;
715 for (int i = 0; i < MAX_TOMBSTONES; i++) {
716 snprintf(path, sizeof(path), TOMBSTONE_TEMPLATE, i);
719 if (!stat(path, &sb)) {
720 if (oldest < 0 || sb.st_mtime < oldest_sb.st_mtime) {
722 oldest_sb.st_mtime = sb.st_mtime;
729 *fd = open(path, O_CREAT | O_EXCL | O_WRONLY | O_NOFOLLOW | O_CLOEXEC, 0600);
733 fchown(*fd, AID_SYSTEM, AID_SYSTEM);
738 ALOGE("Failed to find a valid tombstone, default to using tombstone 0.\n");
742 // we didn't find an available file, so we clobber the oldest one
743 snprintf(path, sizeof(path), TOMBSTONE_TEMPLATE, oldest);
744 *fd = open(path, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC, 0600);
746 ALOGE("failed to open tombstone file '%s': %s\n", path, strerror(errno));
749 fchown(*fd, AID_SYSTEM, AID_SYSTEM);
753 static int activity_manager_connect() {
754 int amfd = socket(PF_UNIX, SOCK_STREAM, 0);
756 struct sockaddr_un address;
759 memset(&address, 0, sizeof(address));
760 address.sun_family = AF_UNIX;
761 strncpy(address.sun_path, NCRASH_SOCKET_PATH, sizeof(address.sun_path));
762 err = TEMP_FAILURE_RETRY(connect(
763 amfd, reinterpret_cast<struct sockaddr*>(&address), sizeof(address)));
766 memset(&tv, 0, sizeof(tv));
767 tv.tv_sec = 1; // tight leash
768 err = setsockopt(amfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
770 tv.tv_sec = 3; // 3 seconds on handshake read
771 err = setsockopt(amfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
783 char* engrave_tombstone(pid_t pid, pid_t tid, int signal, int original_si_code,
784 uintptr_t abort_msg_address, bool dump_sibling_threads,
785 bool* detach_failed, int* total_sleep_time_usec) {
788 log.current_tid = tid;
789 log.crashed_tid = tid;
792 char* path = find_and_open_tombstone(&fd);
795 _LOG(&log, logtype::ERROR, "Skipping tombstone write, nothing to do.\n");
796 *detach_failed = false;
801 // Preserve amfd since it can be modified through the calls below without
803 int amfd = activity_manager_connect();
805 *detach_failed = dump_crash(&log, pid, tid, signal, original_si_code, abort_msg_address,
806 dump_sibling_threads, total_sleep_time_usec);
808 _LOG(&log, logtype::BACKTRACE, "\nTombstone written to: %s\n", path);
810 // Either of these file descriptors can be -1, any error is ignored.