summaryrefslogtreecommitdiffstats
blob: 99da8011b91ef982e236cfdad852e5c19f911243 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
/*
 * Copyright (C) 2012-2014 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.
 */

#define LOG_TAG "DEBUG"

#include "libdebuggerd/tombstone.h"

#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/stat.h>
#include <time.h>

#include <memory>
#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>
#include <backtrace/BacktraceMap.h>
#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/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 void dump_header_info(log_t* log) {
  auto fingerprint = GetProperty("ro.build.fingerprint", "unknown");
  auto revision = GetProperty("ro.revision", "unknown");

  _LOG(log, logtype::HEADER, "Build fingerprint: '%s'\n", fingerprint.c_str());
  _LOG(log, logtype::HEADER, "Revision: '%s'\n", revision.c_str());
  _LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
}

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)) {
      cause = StringPrintf("null pointer dereference");
    } else if (si->si_addr == reinterpret_cast<void*>(0xffff0ffc)) {
      cause = "call to kuser_helper_version";
    } else if (si->si_addr == reinterpret_cast<void*>(0xffff0fe0)) {
      cause = "call to kuser_get_tls";
    } else if (si->si_addr == reinterpret_cast<void*>(0xffff0fc0)) {
      cause = "call to kuser_cmpxchg";
    } else if (si->si_addr == reinterpret_cast<void*>(0xffff0fa0)) {
      cause = "call to kuser_memory_barrier";
    } 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);
  }

  if (!cause.empty()) _LOG(log, logtype::HEADER, "Cause: %s\n", cause.c_str());
}

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);
  } 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);

  dump_probable_cause(log, si);
}

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 (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", thread_info.pid,
       thread_info.tid, thread_info.thread_name.c_str(), thread_info.process_name.c_str());
}

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];

  // 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++) {
    line = "    ";
    if (i == 0 && label >= 0) {
      // Print the label once.
      line += StringPrintf("#%02d  ", label);
    } else {
      line += "     ";
    }
    line += StringPrintf("%" PRIPTR "  %" PRIPTR, *sp, stack_data[i]);

    backtrace_map_t 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_map->GetFunctionName(stack_data[i], &offset);
      if (!func_name.empty()) {
        line += " (" + func_name;
        if (offset) {
          line += StringPrintf("+%" PRIuPTR, offset);
        }
        line += ')';
      }
    }
    _LOG(log, logtype::STACK, "%s\n", line.c_str());

    *sp += sizeof(word_t);
  }
}

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 < 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 = 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 = &frames[i];
    if (sp != frame->sp) {
      _LOG(log, logtype::STACK, "         ........  ........\n");
      sp = frame->sp;
    }
    if (i == last) {
      dump_stack_segment(log, backtrace_map, process_memory, &sp, STACK_WORDS, i);
      if (sp < frame->sp + frame->stack_size) {
        _LOG(log, logtype::STACK, "         ........  ........\n");
      }
    } else {
      size_t words = frame->stack_size / sizeof(word_t);
      if (words == 0) {
        words = 1;
      } else if (words > STACK_WORDS) {
        words = STACK_WORDS;
      }
      dump_stack_segment(log, backtrace_map, process_memory, &sp, words, i);
    }
  }
}

static std::string get_addr_string(uintptr_t addr) {
  std::string addr_str;
#if defined(__LP64__)
  addr_str = StringPrintf("%08x'%08x",
                          static_cast<uint32_t>(addr >> 32),
                          static_cast<uint32_t>(addr & 0xffffffff));
#else
  addr_str = StringPrintf("%08x", addr);
#endif
  return addr_str;
}

static void dump_abort_message(log_t* log, Memory* process_memory, uintptr_t address) {
  if (address == 0) {
    return;
  }

  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];
  if (length >= sizeof(msg)) {
    _LOG(log, logtype::HEADER, "Abort message too long: claimed length = %zd\n", length);
    return;
  }

  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(log_t* log, BacktraceMap* map, Memory* process_memory, uintptr_t addr) {
  bool print_fault_address_marker = addr;

  ScopedBacktraceMapIteratorLock lock(map);
  _LOG(log, logtype::MAPS,
       "\n"
       "memory map (%zu entr%s):",
       map->size(), map->size() == 1 ? "y" : "ies");
  if (print_fault_address_marker) {
    if (map->begin() != map->end() && addr < (*map->begin())->start) {
      _LOG(log, logtype::MAPS, "\n--->Fault address falls at %s before any mapped regions\n",
           get_addr_string(addr).c_str());
      print_fault_address_marker = false;
    } else {
      _LOG(log, logtype::MAPS, " (fault address prefixed with --->)\n");
    }
  } else {
    _LOG(log, logtype::MAPS, "\n");
  }

  std::string line;
  for (auto it = map->begin(); it != map->end(); ++it) {
    const backtrace_map_t* entry = *it;
    line = "    ";
    if (print_fault_address_marker) {
      if (addr < entry->start) {
        _LOG(log, logtype::MAPS, "--->Fault address falls at %s between mapped regions\n",
             get_addr_string(addr).c_str());
        print_fault_address_marker = false;
      } else if (addr >= entry->start && addr < entry->end) {
        line = "--->";
        print_fault_address_marker = false;
      }
    }
    line += get_addr_string(entry->start) + '-' + get_addr_string(entry->end - 1) + ' ';
    if (entry->flags & PROT_READ) {
      line += 'r';
    } else {
      line += '-';
    }
    if (entry->flags & PROT_WRITE) {
      line += 'w';
    } else {
      line += '-';
    }
    if (entry->flags & PROT_EXEC) {
      line += 'x';
    } else {
      line += '-';
    }
    line += StringPrintf("  %8" PRIxPTR "  %8" PRIxPTR, entry->offset, entry->end - entry->start);
    bool space_needed = true;
    if (entry->name.length() > 0) {
      space_needed = false;
      line += "  " + entry->name;
      std::string build_id;
      if ((entry->flags & PROT_READ) && elf_get_build_id(process_memory, entry->start, &build_id)) {
        line += " (BuildId: " + build_id + ")";
      }
    }
    if (entry->load_bias != 0) {
      if (space_needed) {
        line += ' ';
      }
      line += StringPrintf(" (load bias 0x%" PRIxPTR ")", entry->load_bias);
    }
    _LOG(log, logtype::MAPS, "%s\n", line.c_str());
  }
  if (print_fault_address_marker) {
    _LOG(log, logtype::MAPS, "--->Fault address falls at %s after any mapped regions\n",
         get_addr_string(addr).c_str());
  }
}

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());
  }
}

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());
}

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, &current_row, &special_row](const char* name, uint64_t value) {
    auto row = &current_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, thread_info);

  if (thread_info.siginfo) {
    dump_signal_info(log, thread_info.siginfo);
  }

  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_abort_message(log, process_memory, abort_msg_address);
  }

  if (primary_thread) {
    dump_memory_and_code(log, process_memory, thread_info.registers.get());
    if (map) {
      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
// that don't match the specified pid, and writes them to the tombstone file.
//
// 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) {
  bool first = true;
  struct logger_list* logger_list;

  if (!log->should_retrieve_logcat) {
    return;
  }

  logger_list = android_logger_list_open(
      android_name_to_log_id(filename), ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, tail, pid);

  if (!logger_list) {
    ALOGE("Unable to open %s: %s\n", filename, strerror(errno));
    return;
  }

  struct log_msg log_entry;

  while (true) {
    ssize_t actual = android_logger_list_read(logger_list, &log_entry);
    struct logger_entry* entry;

    if (actual < 0) {
      if (actual == -EINTR) {
        // interrupted by signal, retry
        continue;
      } else if (actual == -EAGAIN) {
        // non-blocking EOF; we're done
        break;
      } else {
        ALOGE("Error while reading log: %s\n", strerror(-actual));
        break;
      }
    } else if (actual == 0) {
      ALOGE("Got zero bytes while reading log: %s\n", strerror(errno));
      break;
    }

    // NOTE: if you ALOGV something here, this will spin forever,
    // because you will be writing as fast as you're reading.  Any
    // high-frequency debug diagnostics should just be written to
    // the tombstone file.

    entry = &log_entry.entry_v1;

    if (first) {
      _LOG(log, logtype::LOGS, "--------- %slog %s\n",
        tail ? "tail end of " : "", filename);
      first = false;
    }

    // Msg format is: <priority:1><tag:N>\0<message:N>\0
    //
    // We want to display it in the same format as "logcat -v threadtime"
    // (although in this case the pid is redundant).
    static const char* kPrioChars = "!.VDIWEFS";
    unsigned hdr_size = log_entry.entry.hdr_size;
    if (!hdr_size) {
      hdr_size = sizeof(log_entry.entry_v1);
    }
    if ((hdr_size < sizeof(log_entry.entry_v1)) ||
        (hdr_size > sizeof(log_entry.entry))) {
      continue;
    }
    char* msg = reinterpret_cast<char*>(log_entry.buf) + hdr_size;

    char timeBuf[32];
    time_t sec = static_cast<time_t>(entry->sec);
    struct tm tmBuf;
    struct tm* ptm;
    ptm = localtime_r(&sec, &tmBuf);
    strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm);

    if (log_entry.id() == LOG_ID_EVENTS) {
      if (!g_eventTagMap) {
        g_eventTagMap = android_openEventTagMap(NULL);
      }
      AndroidLogEntry e;
      char buf[512];
      android_log_processBinaryLogBuffer(entry, &e, g_eventTagMap, buf, sizeof(buf));
      _LOG(log, logtype::LOGS, "%s.%03d %5d %5d %c %-8.*s: %s\n",
         timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
         'I', (int)e.tagLen, e.tag, e.message);
      continue;
    }

    unsigned char prio = msg[0];
    char* tag = msg + 1;
    msg = tag + strlen(tag) + 1;

    // consume any trailing newlines
    char* nl = msg + strlen(msg) - 1;
    while (nl >= msg && *nl == '\n') {
      *nl-- = '\0';
    }

    char prioChar = (prio < strlen(kPrioChars) ? kPrioChars[prio] : '?');

    // Look for line breaks ('\n') and display each text line
    // on a separate line, prefixed with the header, like logcat does.
    do {
      nl = strchr(msg, '\n');
      if (nl) {
        *nl = '\0';
        ++nl;
      }

      _LOG(log, logtype::LOGS, "%s.%03d %5d %5d %c %-8s: %s\n",
         timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
         prioChar, tag, msg);
    } while ((msg = nl));
  }

  android_logger_list_free(logger_list);
}

// 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);
}

void engrave_tombstone_ucontext(int tombstone_fd, uintptr_t abort_msg_address, siginfo_t* siginfo,
                                ucontext_t* ucontext) {
  pid_t pid = getpid();
  pid_t tid = gettid();

  log_t log;
  log.current_tid = tid;
  log.crashed_tid = tid;
  log.tfd = tombstone_fd;
  log.amfd_data = nullptr;

  char thread_name[16];
  char process_name[128];

  read_with_default("/proc/self/comm", thread_name, sizeof(thread_name), "<unknown>");
  read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");

  std::unique_ptr<Regs> regs(Regs::CreateFromUcontext(Regs::CurrentArch(), 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,
  };

  std::unique_ptr<BacktraceMap> backtrace_map(BacktraceMap::Create(getpid(), false));
  if (!backtrace_map) {
    ALOGE("failed to create backtrace map");
    _exit(1);
  }

  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);
  }
}