Commit dd12f48d authored Aug 17, 2005 by Bhavesh P. Davda Committed by Linus Torvalds Aug 17, 2005

[PATCH] NPTL signal delivery deadlock fix



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>

parent ade6648b

kernel/signal.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -692,7 +692,7 @@ static void handle_stop_signal(int sig, struct task_struct *p)
		{
		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.
		*/