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| author | Ingo Molnar <mingo@kernel.org> | 2022-08-11 08:54:52 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2022-08-12 11:25:10 +0200 |
| commit | 09348d75a6ce60eec85c86dd0ab7babc4db3caf6 (patch) | |
| tree | 6620daab9bd9ccba94eb8dcb1021cb9ae6a2d4ff /kernel/sched/autogroup.c | |
| parent | ffcf9c5700e49c0aee42dcba9a12ba21338e8136 (diff) | |
| download | linux-stable-09348d75a6ce60eec85c86dd0ab7babc4db3caf6.tar.gz linux-stable-09348d75a6ce60eec85c86dd0ab7babc4db3caf6.tar.bz2 linux-stable-09348d75a6ce60eec85c86dd0ab7babc4db3caf6.zip | |
sched/all: Change all BUG_ON() instances in the scheduler to WARN_ON_ONCE()
There's no good reason to crash a user's system with a BUG_ON(),
chances are high that they'll never even see the crash message on
Xorg, and it won't make it into the syslog either.
By using a WARN_ON_ONCE() we at least give the user a chance to report
any bugs triggered here - instead of getting silent hangs.
None of these WARN_ON_ONCE()s are supposed to trigger, ever - so we ignore
cases where a NULL check is done via a BUG_ON() and we let a NULL
pointer through after a WARN_ON_ONCE().
There's one exception: WARN_ON_ONCE() arguments with side-effects,
such as locking - in this case we use the return value of the
WARN_ON_ONCE(), such as in:
- BUG_ON(!lock_task_sighand(p, &flags));
+ if (WARN_ON_ONCE(!lock_task_sighand(p, &flags)))
+ return;
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/YvSsKcAXISmshtHo@gmail.com
Diffstat (limited to 'kernel/sched/autogroup.c')
| -rw-r--r-- | kernel/sched/autogroup.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched/autogroup.c b/kernel/sched/autogroup.c index 4ebaf97f7bd8..991fc9002535 100644 --- a/kernel/sched/autogroup.c +++ b/kernel/sched/autogroup.c @@ -161,7 +161,8 @@ autogroup_move_group(struct task_struct *p, struct autogroup *ag) struct task_struct *t; unsigned long flags; - BUG_ON(!lock_task_sighand(p, &flags)); + if (WARN_ON_ONCE(!lock_task_sighand(p, &flags))) + return; prev = p->signal->autogroup; if (prev == ag) { |