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dump: Let task handle signals on seize

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When seizing a task and waiting for it to stop, we can receive an event
from kernel, that the task didn't stop, but caught a signal. Don't treat
this as an error, let the victim handle it and proceed.

The transition/fork test should work OK now.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov 2012-03-01 20:25:39 +04:00 committed by Cyrill Gorcunov
parent 1e98f53cca
commit cb0eb0b31e
1 changed files with 14 additions and 4 deletions
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16
ptrace.c
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@ -70,7 +70,7 @@ int seize_task(pid_t pid, pid_t ppid)
pid, ppid, ps.ppid);
goto err;
}
try_again:
ret = ptrace(PTRACE_INTERRUPT, pid, NULL, NULL);
if (ret < 0) {
pr_perror("SEIZE %d: can't interrupt task", pid);
@ -100,11 +100,21 @@ int seize_task(pid_t pid, pid_t ppid)
}
if ((si.si_code >> 8) != PTRACE_EVENT_STOP) {
pr_err("SEIZE %d: wrong stop event received 0x%x\n", pid,
(unsigned int)si.si_code);
/*
* Kernel notifies us about the task being seized received some
* event other than the STOP, i.e. -- a signal. Let the task
* handle one and repeat.
*/
if (ptrace(PTRACE_CONT, pid, NULL,
(void *)(unsigned long)si.si_signo)) {
pr_perror("Can't continue signal handling. Aborting.");
goto err;
}
goto try_again;
}
if (si.si_signo == SIGTRAP)
return TASK_ALIVE;
else if (si.si_signo == SIGSTOP)