glibc/SOURCES/glibc-upstream-2.34-166.patch
2022-11-15 11:09:11 +00:00

36 lines
1.2 KiB
Diff

commit 71326f1f2fd09dafb9c34404765fb88129e94237
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed Apr 20 12:01:43 2022 -0300
nptl: Fix pthread_cancel cancelhandling atomic operations
The 404656009b reversion did not setup the atomic loop to set the
cancel bits correctly. The fix is essentially what pthread_cancel
did prior 26cfbb7162ad.
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
(cherry picked from commit 62be9681677e7ce820db721c126909979382d379)
diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c
index 2680b55586e035fe..64fd183fde59907b 100644
--- a/nptl/pthread_cancel.c
+++ b/nptl/pthread_cancel.c
@@ -122,6 +122,7 @@ __pthread_cancel (pthread_t th)
int newval;
do
{
+ again:
newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK;
if (oldval == newval)
break;
@@ -135,7 +136,7 @@ __pthread_cancel (pthread_t th)
int newval2 = oldval | CANCELING_BITMASK;
if (!atomic_compare_exchange_weak_acquire (&pd->cancelhandling,
&oldval, newval2))
- continue;
+ goto again;
if (pd == THREAD_SELF)
/* This is not merely an optimization: An application may