From: Jens Axboe <axboe@xxxxxxxxx>
[ Upstream commit f5f4fc4649ae542b1a25670b17aaf3cbb6187acc ]
Sergei and John both reported that ia64 failed to boot in 5.11, and it
was related to signals. Turns out the ia64 signal handling is a bit odd,
it doesn't check the return value of get_signal() for whether there's a
signal to deliver or not. With the introduction of TIF_NOTIFY_SIGNAL,
then task_work could trigger it.
Fix it by only calling handle_signal() if we actually have a real signal
to deliver. This brings it in line with all other archs, too.
Fixes: b269c229b0e8 ("ia64: add support for TIF_NOTIFY_SIGNAL")
Reported-by: Sergei Trofimovich <slyich@xxxxxxxxx>
Reported-by: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Tested-by: Sergei Trofimovich <slyich@xxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/ia64/kernel/signal.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -341,7 +341,8 @@ ia64_do_signal (struct sigscratch *scr,
* need to push through a forced SIGSEGV.
*/
while (1) {
- get_signal(&ksig);
+ if (!get_signal(&ksig))
+ break;
/*
* get_signal() may have run a debugger (via notify_parent())
