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[PATCH] NPTL signal delivery deadlock fix

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This bug is quite subtle and only happens in a very interesting
situation where a real-time threaded process is in the middle of a
coredump when someone whacks it with a SIGKILL.  However, this deadlock
leaves the system pretty hosed and you have to reboot to recover.

Not good for real-time priority-preemption applications like our
telephony application, with 90+ real-time (SCHED_FIFO and SCHED_RR)
processes, many of them multi-threaded, interacting with each other for
high volume call processing.

Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bhavesh P. Davda 2005-08-17 12:26:33 -06:00 committed by Linus Torvalds
parent ade6648b3b
commit dd12f48d4e
1 changed files with 1 additions and 1 deletions
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2
kernel/signal.c
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@ -692,7 +692,7 @@ static void handle_stop_signal(int sig, struct task_struct *p)
{ {
struct task_struct *t; struct task_struct *t;
if (p->flags & SIGNAL_GROUP_EXIT) if (p->signal->flags & SIGNAL_GROUP_EXIT)
/* /*
* The process is in the middle of dying already. * The process is in the middle of dying already.
*/ */