linux-kernel - possible deadlock in shmem_file

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Message-ID: <001a1137486027d0df056415ff15@google.com>
Date:   Wed, 31 Jan 2018 09:42:01 -0800
From:   syzbot <syzbot+8ec30bb7bf1a981a2012@...kaller.appspotmail.com>
To:     arve@...roid.com, devel@...verdev.osuosl.org, dvyukov@...gle.com,
        gregkh@...uxfoundation.org, hughd@...gle.com, joelaf@...gle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, maco@...roid.com,
        syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: possible deadlock in shmem_file_llseek

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger  
crash:

Reported-and-tested-by:  
syzbot+8ec30bb7bf1a981a2012@...kaller.appspotmail.com

Note: the tag will also help syzbot to understand when the bug is fixed.

Tested on upstream commit
3da90b159b146672f830bcd2489dd3a1f4e9e089 (Wed Jan 31 03:07:32 2018 +0000)
Merge tag 'f2fs-for-4.16-rc1' of  
git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

compiler: gcc (GCC) 7.1.1 20170620
Patch is attached.
Kernel config is attached.


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View attachment "patch.diff" of type "text/plain" (508 bytes)

View attachment "config.txt" of type "text/plain" (134521 bytes)