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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
This commit is contained in:
Frederic Weisbecker 2020-11-17 16:16:35 +01:00 committed by Peter Zijlstra
parent 179a9cf792
commit 9f68b5b74c
1 changed files with 1 additions and 0 deletions
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kernel/sched/core.c
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@ -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));