The following commit has been merged into the core/entry branch of tip: Commit-ID: 9f68b5b74c48761bcbd7d90cf1426049bdbaabb7 Gitweb: https://git.kernel.org/tip/9f68b5b74c48761bcbd7d90cf1426049bdbaabb7 Author: Frederic Weisbecker <frederic@xxxxxxxxxx> AuthorDate: Tue, 17 Nov 2020 16:16:35 +01:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Thu, 19 Nov 2020 11:25:42 +01:00 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@xxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20201117151637.259084-4-frederic@xxxxxxxxxx --- kernel/sched/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d2003a7..c23d7cb 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));
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