linux-kernel - [BUG] kernel: locking: a possible sleep-in-atomic-context bug in rt_mutex

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Date:   Thu, 21 Jun 2018 11:14:49 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     peterz@...radead.org, mingo@...hat.com
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] kernel: locking: a possible sleep-in-atomic-context bug in
 rt_mutex_slowlock()

The kernel may sleep with holding a spinlock.
The function call path (from bottom to top) in Linux-4.16.7 is:

[FUNC] schedule
kernel/locking/rtmutex.c, 1223: schedule in rt_mutex_handle_deadlock
kernel/locking/rtmutex.c, 1273: rt_mutex_handle_deadlock in 
rt_mutex_slowlock
kernel/locking/rtmutex.c, 1249: _raw_spin_lock_irqsave in rt_mutex_slowlock

This bug is found by my static analysis tool (DSAC-2) and checked by my
code review.

I do not know how to correctly fix this bug, so I just report them.

Best wishes,
Jia-Ju Bai