INFO: task syz-executor can't die for more than 143 seconds. (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 4c43049f Add linux-next specific files for 20200716
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12811780900000
kernel config: https://syzkaller.appspot.com/x/.config?x=2c76d72659687242
dashboard link: https://syzkaller.appspot.com/bug?extid=82bb085bb1a7ee87d08a
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+82bb08...@syzkaller.appspotmail.com

INFO: task syz-executor.1:22321 can't die for more than 143 seconds.
syz-executor.1 R running task 27640 22321 6933 0x00004006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1158:
#0: ffffffff89c53980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
1 lock held by in:imklog/6510:
#0: ffff888095ae3db0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
2 locks held by agetty/6525:
#0: ffff88809e509098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc90000f642e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156
2 locks held by agetty/6526:
#0: ffff88809ffeb098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc90000f902e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/22321:
=============================================

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 PID: 1158 Comm: khungtaskd Not tainted 5.8.0-rc5-next-20200716-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+0x18f/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:231
check_hung_uninterruptible_tasks kernel/hung_task.c:257 [inline]
watchdog.cold+0x23e/0x24b kernel/hung_task.c:339
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.