linux-kernel - possible deadlock (4)

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Message-ID: <001a113de374de24f00562cca7c4@google.com>
Date:   Mon, 15 Jan 2018 00:46:52 -0800
From:   syzbot <syzbot+a9b2d0e21403c12cb074@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: possible deadlock (4)

Hello,

syzkaller hit the following crash on  
2c1cfa49901839136e578ca516a7e230182da024
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a9b2d0e21403c12cb074@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
If you forward the report, please keep this part and the footer.

audit: type=1400 audit(1515952945.475:8): avc:  denied  { map } for   
pid=3656 comm="syzkaller443286" path="/dev/ashmem" dev="devtmpfs" ino=8948  
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=system_u:object_r:device_t:s0 tclass=chr_file permissive=1

======================================================
WARNING: possible circular locking dependency detected
4.15.0-rc7+ #261 Not tainted
----------------------------------------------

---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.

syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is  
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
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View attachment "config.txt" of type "text/plain" (135039 bytes)

Download attachment "raw.log" of type "application/octet-stream" (2421 bytes)

View attachment "repro.txt" of type "text/plain" (488 bytes)

Download attachment "repro.c" of type "application/octet-stream" (6604 bytes)