linux-kernel - [BUG] fs/dcache: might_sleep is called under a spinlock

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Message-ID: <a64563c5-9f87-5150-fb2f-4e7220703c2d@163.com>
Date:   Tue, 3 Oct 2017 10:38:25 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     viro@...iv.linux.org.uk
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] fs/dcache: might_sleep is called under a spinlock

According to fs/dcache.c, might_sleep is called under a spinlock,
and the function call path is:
d_prune_aliases (acquire the spinlock)
   dput
     might_sleep

This bug is found by my static analysis tool and my code review.
A possible fix is to remove might_sleep in dput.

Thanks,
Jia-Ju Bai