Re: INFO: rcu detected stall in _raw_spin_unlock

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To: syzbot <syzbot+de49a4f1661f0fa54bc3@xxxxxxxxxxxxxxxxxxxxxxxxx>, viro@xxxxxxxxxxxxxxxxxx
Subject: Re: INFO: rcu detected stall in _raw_spin_unlock
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 14 Apr 2018 16:02:28 +0900
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx
In-reply-to: <089e082bb5107aa0f80569b5ec2b@google.com>
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

Infinite loop inside shrink_dcache_parent() due to lack of cond_resched().
I can reproduce this issue by running the reproducer on one CPU (using "taskset -c 0").
Reverting commit 32785c0539b7e96f ("fs/dcache.c: add cond_resched() in shrink_dentry_list()")
solves this issue.

#syz dup: INFO: rcu detected stall in d_walk

References:
- INFO: rcu detected stall in _raw_spin_unlock
  - From: syzbot

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