Commit-ID: 192301e70af3f6803c6354a464ebfa742da738ae Gitweb: http://git.kernel.org/tip/192301e70af3f6803c6354a464ebfa742da738ae Author: Oleg Nesterov <o...@redhat.com> AuthorDate: Wed, 13 Nov 2013 16:45:38 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Wed, 27 Nov 2013 13:50:53 +0100
sched: Check TASK_DEAD rather than EXIT_DEAD in schedule_debug() schedule_debug() ignores in_atomic() if prev->exit_state != 0. This is not what we want, ->exit_state is set by exit_notify() but we should complain until the task does the last schedule() in TASK_DEAD. See also 7407251a0e2e "PF_DEAD cleanup", I think this ancient commit explains why schedule() had to rely on ->exit_state, until that commit exit_notify() disabled preemption and set PF_DEAD which was used to detect the exiting task. Signed-off-by: Oleg Nesterov <o...@redhat.com> Signed-off-by: Peter Zijlstra <pet...@infradead.org> Cc: David Laight <david.lai...@aculab.com> Cc: Geert Uytterhoeven <ge...@linux-m68k.org> Cc: Tejun Heo <t...@kernel.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Link: http://lkml.kernel.org/r/20131113154538.gb15...@redhat.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- kernel/sched/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 687985b..19db8f3 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2414,10 +2414,10 @@ static inline void schedule_debug(struct task_struct *prev) { /* * Test if we are atomic. Since do_exit() needs to call into - * schedule() atomically, we ignore that path for now. - * Otherwise, whine if we are scheduling when we should not be. + * schedule() atomically, we ignore that path. Otherwise whine + * if we are scheduling when we should not. */ - if (unlikely(in_atomic_preempt_off() && !prev->exit_state)) + if (unlikely(in_atomic_preempt_off() && prev->state != TASK_DEAD)) __schedule_bug(prev); rcu_sleep_check(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
