INFO: task syz-executor639:7203 can't die for more than 143 seconds.
syz-executor639 R  running task    23944  7203   7200 0x00004006
Call Trace:
INFO: task syz-executor639:7204 can't die for more than 144 seconds.
syz-executor639 R  running task    26256  7204   7202 0x00004006
Call Trace:
INFO: task syz-executor639:7205 can't die for more than 146 seconds.
syz-executor639 R  running task    24056  7205   7198 0x00004006
Call Trace:
 arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
 lock_release+0x45f/0x800 kernel/locking/lockdep.c:4955
INFO: task syz-executor639:7206 can't die for more than 148 seconds.
syz-executor639 R  running task    23864  7206   7197 0x00004006
Call Trace:
INFO: task syz-executor639:7207 can't die for more than 149 seconds.
syz-executor639 R  running task    26256  7207   7199 0x00004006
Call Trace:
INFO: task syz-executor639:7216 can't die for more than 151 seconds.
syz-executor639 R  running task    24224  7216   7201 0x00004006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1168:
 #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754
1 lock held by kswapd0/1906:
1 lock held by kswapd1/1907:
1 lock held by in:imklog/6869:
 #0: ffff8880969971b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
1 lock held by syz-executor639/7203:
1 lock held by syz-executor639/7204:
2 locks held by syz-executor639/7205:
2 locks held by syz-executor639/7206:
2 locks held by syz-executor639/7207:
1 lock held by syz-executor639/7216:

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

NMI backtrace for cpu 0
CPU: 0 PID: 1168 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7205 Comm: syz-executor639 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unwind_next_frame+0x27/0x19d0 arch/x86/kernel/unwind_orc.c:385
Code: 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 49 89 ff 41 56 41 55 41 54 55 53 48 81 ec a0 00 00 00 48 c7 44 24 40 b3 8a b5 41 <48> 8d 5c 24 40 48 c7 44 24 48 39 b2 48 89 48 c1 eb 03 48 c7 44 24
RSP: 0018:ffffc9000537eed8 EFLAGS: 00000286
RAX: dffffc0000000000 RBX: ffffffff81625660 RCX: 0000000000000000