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From: Frederic Weisbecker <frederic@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Phil Auld <pauld@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH 3/5] sched: Detect call to schedule from critical entry code
Date: Tue, 17 Nov 2020 16:16:35 +0100
Message-ID: <20201117151637.259084-4-frederic@kernel.org> (raw)
In-Reply-To: <20201117151637.259084-1-frederic@kernel.org>

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>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Phil Auld <pauld@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/sched/core.c | 1 +
 1 file changed, 1 insertion(+)

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));
 
-- 
2.25.1


  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-17 15:16 [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() v3 Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 1/5] context_tracking: Introduce HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 2/5] context_tracking: Don't implement exception_enter/exit() on CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` Frederic Weisbecker [this message]
2020-11-20 12:44   ` [tip: core/entry] sched: Detect call to schedule from critical entry code tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 4/5] context_tracking: Only define schedule_user() on !HAVE_CONTEXT_TRACKING_OFFSTACK archs Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 5/5] x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-18  7:39 ` [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() v3 Peter Zijlstra
2020-11-18 13:48   ` Frederic Weisbecker
2020-11-18 14:05     ` Peter Zijlstra
2020-11-18 14:20       ` Frederic Weisbecker
  -- strict thread matches above, loose matches on Subject: below --
2020-10-27 15:08 [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() v2 Frederic Weisbecker
2020-10-27 15:08 ` [PATCH 3/5] sched: Detect call to schedule from critical entry code Frederic Weisbecker
2020-10-05 10:49 [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() Frederic Weisbecker
2020-10-05 10:49 ` [PATCH 3/5] sched: Detect call to schedule from critical entry code Frederic Weisbecker
2020-10-05 11:23   ` Peter Zijlstra
2020-10-05 12:26     ` Frederic Weisbecker
2020-10-07  9:34       ` Mel Gorman
2020-10-26 14:37         ` Frederic Weisbecker

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