linux-kernel - BUG: workqueue lockup (2)

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Date:   Tue, 19 Dec 2017 04:25:01 -0800
From:   syzbot 
        <bot+e38be687a2450270a3b593bacb6b5795a7a74edb@...kaller.appspotmail.com>
To:     dvyukov@...gle.com, gregkh@...uxfoundation.org,
        kstewart@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, penguin-kernel@...ove.SAKURA.ne.jp,
        pombredanne@...b.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: BUG: workqueue lockup (2)

syzkaller has found reproducer for the following crash on  
f3b5ad89de16f5d42e8ad36fbdf85f705c1ae051
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


BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 37s!
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 32s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
     pending: cache_reap
workqueue events_power_efficient: flags=0x80
   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
     pending: neigh_periodic_work, do_cache_clean
workqueue mm_percpu_wq: flags=0x8
   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
     pending: vmstat_update
workqueue kblockd: flags=0x18
   pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256
     pending: blk_timeout_work


View attachment "config.txt" of type "text/plain" (126475 bytes)

Download attachment "raw.log" of type "application/octet-stream" (2365 bytes)

View attachment "repro.txt" of type "text/plain" (1383 bytes)

Download attachment "repro.c" of type "application/octet-stream" (11812 bytes)