INFO: task syz-executor605:6852 can't die for more than 143 seconds.
task:syz-executor605 state:R  running task     stack:27160 pid: 6852 ppid:  6851 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:3772 [inline]
 __schedule+0xec5/0x2200 kernel/sched/core.c:4521
 schedule+0xcf/0x270 kernel/sched/core.c:4599
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1881
 io_schedule_timeout+0xc6/0x140 kernel/sched/core.c:6281

Showing all locks held in the system:
1 lock held by khungtaskd/1171:
 #0: ffffffff8a554da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6242
1 lock held by in:imklog/6641:
 #0: ffff8880a8a4f8f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
6 locks held by syz-executor605/6852:

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

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 PID: 1171 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..