INFO: task syz-executor.2:16074 can't die for more than 143 seconds.
syz-executor.2  R  running task    26336 16074   7230 0x00004006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1160:
 #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754
1 lock held by in:imklog/6752:
 #0: ffff888099a030f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826

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

NMI backtrace for cpu 1
CPU: 1 PID: 1160 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-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+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline]
 watchdog+0xde3/0x14e0 kernel/hung_task.c:333
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:hlock_class kernel/locking/lockdep.c:179 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4029 [inline]
RIP: 0010:__lock_acquire+0x42a/0x4c50 kernel/locking/lockdep.c:4305
Code: be 08 00 00 00 48 c1 ef 03 41 81 e5 ff 1f 00 00 81 e7 f8 03 00 00 48 81 c7 e0 39 31 8c e8 3e 07 58 00 4c 0f a3 2d 26 17 d8 0a <0f> 83 d7 17 00 00 4d 69 ed b8 00 00 00 49 81 c5 00 3e 31 8c 49 8d
RSP: 0018:ffffc90000dd7948 EFLAGS: 00000047
RAX: 0000000000000001 RBX: 000000000000002c RCX: ffffffff815922b2
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8c3139e0
RBP: ffff8880a97e8ec8 R08: 1ffff110152fd1d8 R09: fffffbfff186273d
R10: ffffffff8c3139e7 R11: fffffbfff186273c R12: ffff8880a97e8580
R13: 000000000000002c R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa3476b5018 CR3: 000000009f68e000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000cb5e8b80 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
 rcu_lock_acquire include/linux/rcupdate.h:208 [inline]
 rcu_read_lock include/linux/rcupdate.h:601 [inline]
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:754 [inline]
 batadv_iv_ogm_schedule_buff+0x58b/0x1280 net/batman-adv/bat_iv_ogm.c:825
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x5c8/0x7c0 net/batman-adv/bat_iv_ogm.c:1722
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352