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main: log which process send SIGNAL to PID1

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This can help users to figure out what makes systemd freeze.
1. Someone kills systemd accidentally, then the sender_pid won't be 1;
2. systemd triggers segfault or assert, then the sender_pid will be 1;
This commit is contained in:
licunlong 2022-03-08 19:18:36 +08:00 committed by Yu Watanabe
parent 4db62561c2
commit 7347b3db83
1 changed files with 11 additions and 3 deletions
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14
src/core/main.c
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@ -228,7 +228,7 @@ _noreturn_ static void freeze_or_exit_or_reboot(void) {
freeze();
}
_noreturn_ static void crash(int sig) {
_noreturn_ static void crash(int sig, siginfo_t *siginfo, void *context) {
struct sigaction sa;
pid_t pid;
@ -273,6 +273,14 @@ _noreturn_ static void crash(int sig) {
siginfo_t status;
int r;
if (siginfo) {
_cleanup_free_ char *cmdline = NULL;
pid_t sender_pid = siginfo->si_pid;
(void) get_process_cmdline(sender_pid, SIZE_MAX, 0, &cmdline);
log_emergency("Caught <%s> from PID "PID_FMT" (%s)", signal_to_string(sig), sender_pid, strna(cmdline));
}
/* Order things nicely. */
r = wait_for_terminate(pid, &status);
if (r < 0)
@ -330,8 +338,8 @@ _noreturn_ static void crash(int sig) {
static void install_crash_handler(void) {
static const struct sigaction sa = {
.sa_handler = crash,
.sa_flags = SA_NODEFER, /* So that we can raise the signal again from the signal handler */
.sa_sigaction = crash,
.sa_flags = SA_NODEFER | SA_SIGINFO, /* So that we can raise the signal again from the signal handler */
};
int r;