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From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: dave@stgolabs.net, paulmck@linux.vnet.ibm.com,
	josh@joshtriplett.org, rostedt@goodmis.org,
	mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [BUG] kernel: rcu: a possible sleep-in-atomic-context bug in srcu_read_delay()
Date: Mon, 13 Aug 2018 11:04:10 +0800	[thread overview]
Message-ID: <4179b4d2-b832-abcd-d407-b865765f28d6@gmail.com> (raw)

The kernel may sleep with holding a spinlock.

The function call paths (from bottom to top) in Linux-4.16 are:

[FUNC] schedule_timeout_interruptible
kernel/rcu/rcutorture.c, 523: schedule_timeout_interruptible in 
srcu_read_delay
kernel/rcu/rcutorture.c, 1105: [FUNC_PTR]srcu_read_delay in 
rcu_torture_timer
kernel/rcu/rcutorture.c, 1104: spin_lock in rcu_torture_timer

Note that [FUNC_PTR] means a function pointer call is used.

I do not find a good way to fix, so I only report.
This is found by my static analysis tool (DSAC).


Thanks,
Jia-Ju Bai

             reply	other threads:[~2018-08-13  3:05 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-13  3:04 Jia-Ju Bai [this message]
2018-08-13  4:18 ` Paul E. McKenney
2018-08-13  9:26   ` Jia-Ju Bai
2018-08-13 12:42     ` Paul E. McKenney
2018-08-15  1:05       ` Jia-Ju Bai

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