INFO: task syz-executor399:8499 can't die for more than 143 seconds.
task:syz-executor399 state:R  running task     stack:27176 pid: 8499 ppid:  8494 flags:0x00004006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1665:
 #0: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254
2 locks held by in:imklog/8185:
 #0: ffff8880219a5270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947
 #1: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: rq_lock kernel/sched/sched.h:1318 [inline]
 #1: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: __schedule+0x235/0x21b0 kernel/sched/core.c:4995
2 locks held by syz-executor399/8499:

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

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.10.0-next-20201218-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..