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Merge "Only one crashing thread should contact debuggerd."

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Christopher Ferris 2015-01-29 01:49:20 +00:00 committed by Gerrit Code Review
commit 43606bc1ce
1 changed files with 20 additions and 1 deletions
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21
linker/debugger.cpp
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@ -30,9 +30,11 @@
#include <errno.h>
#include <inttypes.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/socket.h>
@ -212,6 +214,23 @@ static void send_debuggerd_packet(siginfo_t* info) {
return;
}
// Mutex to prevent multiple crashing threads from trying to talk
// to debuggerd at the same time.
static pthread_mutex_t crash_mutex = PTHREAD_MUTEX_INITIALIZER;
int ret = pthread_mutex_trylock(&crash_mutex);
if (ret != 0) {
if (ret == EBUSY) {
__libc_format_log(ANDROID_LOG_INFO, "libc",
"Another thread has contacted debuggerd first, stop and wait for process to die.");
// This will never complete since the lock is never released.
pthread_mutex_lock(&crash_mutex);
} else {
__libc_format_log(ANDROID_LOG_INFO, "libc",
"pthread_mutex_trylock failed: %s", strerror(ret));
}
return;
}
int s = socket_abstract_client(DEBUGGER_SOCKET_NAME, SOCK_STREAM | SOCK_CLOEXEC);
if (s == -1) {
__libc_format_log(ANDROID_LOG_FATAL, "libc", "Unable to open connection to debuggerd: %s",
@ -228,7 +247,7 @@ static void send_debuggerd_packet(siginfo_t* info) {
msg.tid = gettid();
msg.abort_msg_address = reinterpret_cast<uintptr_t>(g_abort_message);
msg.original_si_code = (info != nullptr) ? info->si_code : 0;
int ret = TEMP_FAILURE_RETRY(write(s, &msg, sizeof(msg)));
ret = TEMP_FAILURE_RETRY(write(s, &msg, sizeof(msg)));
if (ret == sizeof(msg)) {
char debuggerd_ack;
ret = TEMP_FAILURE_RETRY(read(s, &debuggerd_ack, 1));