From: Bhavesh P. Davda Date: Wed, 17 Aug 2005 18:26:33 +0000 (-0600) Subject: [PATCH] NPTL signal delivery deadlock fix X-Git-Tag: v2.6.13-rc7~68 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=dd12f48d4e8774415b528d3991ae47c28f26e1ac;p=linux-2.6-omap-h63xx.git [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 Signed-off-by: Linus Torvalds --- diff --git a/kernel/signal.c b/kernel/signal.c index ca1186eef93..d282fea8113 100644 --- 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. */