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Date:   Tue, 15 Dec 2020 18:45:09 -0800
From:   syzbot <syzbot+61cb1d04bf13f0c631b1@...kaller.appspotmail.com>
To:     ast@...nel.org, christian.brauner@...ntu.com, daniel@...earbox.net,
        davem@...emloft.net, gnault@...hat.com, kuba@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: INFO: task can't die in corrupted (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    9317f948 Add linux-next specific files for 20201215
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=151add97500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5c81cc44aa25b5b3
dashboard link: https://syzkaller.appspot.com/bug?extid=61cb1d04bf13f0c631b1
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=177df703500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1342f30f500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+61cb1d04bf13f0c631b1@...kaller.appspotmail.com

INFO: task syz-executor656:8498 can't die for more than 143 seconds.
task:syz-executor656 state:R  running task     stack:27904 pid: 8498 ppid:  8493 flags:0x00004006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1647:
 #0: ffffffff8b78f920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254
1 lock held by in:imklog/8185:
 #0: ffff88801ad9e0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:923
3 locks held by syz-executor656/8498:

=============================================

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 1647 Comm: khungtaskd Not tainted 5.10.0-next-20201215-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 panic+0x343/0x77f kernel/panic.c:231
 check_hung_uninterruptible_tasks kernel/hung_task.c:257 [inline]
 watchdog.cold+0x157/0x31d kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel Offset: disabled
Rebooting in 86400 seconds..

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