INFO: task can't die in corrupted

From: syzbot
Date: Wed Oct 07 2020 - 05:18:24 EST


Hello,

syzbot found the following issue on:

HEAD commit: a804ab08 Add linux-next specific files for 20201006
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17fe30bf900000
kernel config: https://syzkaller.appspot.com/x/.config?x=26c1b4cc4a62ccb
dashboard link: https://syzkaller.appspot.com/bug?extid=ee250ac8137be41d7b13
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1336413b900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f7392b900000

The issue was bisected to:

commit eede846af512572b1f30b34f9889d7df64c017d4
Author: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Date: Fri Oct 2 21:17:35 2020 +0000

f2fs: f2fs_get_meta_page_nofail should not be failed

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a8aafb900000
console output: https://syzkaller.appspot.com/x/log.txt?x=14a8aafb900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ee250ac8137be41d7b13@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: eede846af512 ("f2fs: f2fs_get_meta_page_nofail should not be failed")

INFO: task syz-executor178:6870 can't die for more than 143 seconds.
task:syz-executor178 state:R
stack:26960 pid: 6870 ppid: 6869 flags:0x00004006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1179:
#0: ffffffff8a554da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6242
1 lock held by systemd-journal/3920:
1 lock held by in:imklog/6769:
#0: ffff88809eebc130 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
1 lock held by syz-executor178/6870:
#0: ffff8880925120e0 (&type->s_umount_key#47/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229

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

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 1179 Comm: khungtaskd Not tainted 5.9.0-rc8-next-20201006-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x198/0x1fb lib/dump_stack.c:118
panic+0x382/0x7fb kernel/panic.c:231
check_hung_uninterruptible_tasks kernel/hung_task.c:257 [inline]
watchdog.cold+0x23e/0x248 kernel/hung_task.c:339
kthread+0x3af/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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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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https://goo.gl/tpsmEJ#testing-patches