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feat(ndk): identify the error reporting thread in native crashes
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lemnik committed Oct 4, 2024
1 parent 213673c commit db4cdc3
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Showing 8 changed files with 28 additions and 4 deletions.
7 changes: 7 additions & 0 deletions CHANGELOG.md
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@@ -1,5 +1,12 @@
# Changelog

## TBD

### Enhancements

* Native crashes will now identify the crashing/error reporting thread
[#2087](https://github.com/bugsnag/bugsnag-android/pull/2087)

## 6.8.0 (2024-09-30)

### Enhancements
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1 change: 1 addition & 0 deletions bugsnag-plugin-android-ndk/src/main/jni/event.h
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Expand Up @@ -191,6 +191,7 @@ typedef struct {

typedef struct {
pid_t id;
bool is_reporting_thread;
char name[16];
char state[13];
} bsg_thread;
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Expand Up @@ -4,6 +4,7 @@
#include <pthread.h>
#include <stdexcept>
#include <string>
#include <unistd.h>

#include "../utils/crash_info.h"
#include "../utils/serializer.h"
Expand Down Expand Up @@ -58,7 +59,7 @@ void bsg_handle_cpp_terminate() {

if (bsg_global_env->send_threads != SEND_THREADS_NEVER) {
bsg_global_env->next_event.thread_count = bsg_capture_thread_states(
bsg_global_env->next_event.threads, BUGSNAG_THREADS_MAX);
gettid(), bsg_global_env->next_event.threads, BUGSNAG_THREADS_MAX);
} else {
bsg_global_env->next_event.thread_count = 0;
}
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Expand Up @@ -188,7 +188,7 @@ void bsg_handle_signal(int signum, siginfo_t *info,

if (bsg_global_env->send_threads != SEND_THREADS_NEVER) {
bsg_global_env->next_event.thread_count = bsg_capture_thread_states(
bsg_global_env->next_event.threads, BUGSNAG_THREADS_MAX);
gettid(), bsg_global_env->next_event.threads, BUGSNAG_THREADS_MAX);
} else {
bsg_global_env->next_event.thread_count = 0;
}
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Expand Up @@ -605,6 +605,12 @@ static bool bsg_write_threads(BSG_KSJSONEncodeContext *json,
CHECKED(bsg_ksjsonbeginObject(json, NULL));
{
CHECKED(JSON_LIMITED_STRING_ELEMENT("id", id_string));

if (thread->is_reporting_thread) {
CHECKED(
bsg_ksjsonaddBooleanElement(json, "errorReportingThread", true));
}

CHECKED(JSON_LIMITED_STRING_ELEMENT("name", thread->name));
CHECKED(JSON_LIMITED_STRING_ELEMENT("state", thread->state));
CHECKED(JSON_CONSTANT_ELEMENT("type", "c"));
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5 changes: 4 additions & 1 deletion bugsnag-plugin-android-ndk/src/main/jni/utils/threads.c
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Expand Up @@ -167,7 +167,8 @@ static bool read_thread_state(bsg_thread *dest, const char *tid) {
return parse_success;
}

size_t bsg_capture_thread_states(bsg_thread *threads, size_t max_threads) {
size_t bsg_capture_thread_states(pid_t reporting_tid, bsg_thread *threads,
size_t max_threads) {
size_t total_thread_count = 0;
struct dirent64 *entry;
char buffer[1024];
Expand All @@ -187,6 +188,8 @@ size_t bsg_capture_thread_states(bsg_thread *threads, size_t max_threads) {
for (offset = 0; offset < available && total_thread_count < max_threads;) {
entry = (struct dirent64 *)(buffer + offset);
if (read_thread_state(&threads[total_thread_count], entry->d_name)) {
threads[total_thread_count].is_reporting_thread =
threads[total_thread_count].id == reporting_tid;
total_thread_count += 1;
}

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2 changes: 1 addition & 1 deletion bugsnag-plugin-android-ndk/src/main/jni/utils/threads.h
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Expand Up @@ -10,7 +10,7 @@ extern "C" {

#define MAX_STAT_PATH_LENGTH 64

size_t bsg_capture_thread_states(bsg_thread *threads,
size_t bsg_capture_thread_states(pid_t reporting_tid, bsg_thread *threads,
size_t max_threads) __asyncsafe;

#ifdef __cplusplus
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6 changes: 6 additions & 0 deletions features/smoke_tests/04_unhandled.feature
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Expand Up @@ -292,3 +292,9 @@ Feature: Unhandled smoke tests
# Breadcrumbs
And the event has a "manual" breadcrumb named "CXXExceptionSmokeScenario"

# Threads validation
And the error payload field "events.0.threads" is a non-empty array
And the event "threads.0.id" matches "^[0-9]+$"
And the event "threads.0.name" is not null
And the event "threads.0.type" equals "c"
And the thread with name "roid.mazerunner" contains the error reporting flag

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