[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>

diff --git a/kernel/signal.c b/kernel/signal.c
index ca1186e..d282fea 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -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.
                 */