INFO: task syz-executor.1:15071 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:27072 pid:15071 ppid:  6949 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 perf_event_free_task+0x513/0x6b0 kernel/events/core.c:12446
 copy_process+0x4451/0x6920 kernel/fork.c:2326
 _do_fork+0xe8/0xb10 kernel/fork.c:2428
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2545
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: Bad RIP value.
RSP: 002b:00007eff21b6ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000001f40 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000a9885700
RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007eff21b6b9c0 R15: 000000000118cf4c

Showing all locks held in the system:
1 lock held by khungtaskd/1168:
 #0: ffffffff89bd6a40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5829
1 lock held by in:imklog/6531:
 #0: ffff88809339cd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930

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

NMI backtrace for cpu 1
CPU: 1 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc3-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+0x198/0x1fd lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd7d/0x1000 kernel/hung_task.c:295
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6845 Comm: syz-fuzzer Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x775c9e
Code: 89 4c 24 50 31 db eb 12 48 8b b4 24 d0 00 00 00 48 83 c6 10 48 89 f0 48 89 cb 48 89 84 24 d0 00 00 00 48 89 5c 24 40 48 8b 08 <48> 8b 50 08 48 89 0c 24 48 89 54 24 08 48 8b 8c 24 10 01 00 00 48
RSP: 002b:000000c002faabe8 EFLAGS: 00000246
RAX: 000000c01308ce60 RBX: 0000000000000000 RCX: 0000000000b1efc0
RDX: 000000c0237aac40 RSI: 0000000000000020 RDI: 0000000000000020
RBP: 000000c002faacd8 R08: 00007f07816e3563 R09: 0000000000203008
R10: 0000000000000004 R11: 00000000000000da R12: 0000000000000001
R13: 00aaaaaaaaaaaaaa R14: 0000000000adac65 R15: 0000000000000038
FS:  00000000019610f0 GS:  0000000000000000