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| author | Frederic Weisbecker <frederic@kernel.org> | 2020-11-17 18:16:35 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-11-19 13:25:42 +0300 |
| commit | 9f68b5b74c48761bcbd7d90cf1426049bdbaabb7 (patch) | |
| tree | d121e17b162a5fdd759f0768e5462c1fab11c394 /kernel/sched | |
| parent | 179a9cf79212bb3b96fb69a314583189cd863c5b (diff) | |
| download | linux-9f68b5b74c48761bcbd7d90cf1426049bdbaabb7.tar.xz | |
sched: Detect call to schedule from critical entry code
Detect calls to schedule() between user_enter() and user_exit(). Those
are symptoms of early entry code that either forgot to protect a call
to schedule() inside exception_enter()/exception_exit() or, in the case
of HAVE_CONTEXT_TRACKING_OFFSTACK, enabled interrupts or preemption in
a wrong spot.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201117151637.259084-4-frederic@kernel.org
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d2003a7d5ab5..c23d7cb5aee3 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4291,6 +4291,7 @@ static inline void schedule_debug(struct task_struct *prev, bool preempt) preempt_count_set(PREEMPT_DISABLED); } rcu_sleep_check(); + SCHED_WARN_ON(ct_state() == CONTEXT_USER); profile_hit(SCHED_PROFILING, __builtin_return_address(0)); |