BUG: MAX_STACK_TRACE_ENTRIES too low!
turning off the locking correctness validator.
CPU: 1 PID: 22412 Comm: syz-executor.4 Not tainted 5.3.0-rc1-next-20190724 #50
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+0x172/0x1f0 lib/dump_stack.c:113
 save_trace kernel/locking/lockdep.c:473 [inline]
 save_trace.isra.0.cold+0x14/0x19 kernel/locking/lockdep.c:458
 mark_lock+0x3db/0x11e0 kernel/locking/lockdep.c:3583
 mark_usage kernel/locking/lockdep.c:3505 [inline]
 __lock_acquire+0x1380/0x4c30 kernel/locking/lockdep.c:3834
 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4413
 flush_workqueue+0x126/0x14b0 kernel/workqueue.c:2774
 drain_workqueue+0x1b4/0x470 kernel/workqueue.c:2939
 destroy_workqueue+0x21/0x6c0 kernel/workqueue.c:4320
 xfs_destroy_mount_workqueues+0xeb/0x150 fs/xfs/xfs_super.c:864
 xfs_fs_fill_super+0x90f/0x16e0 fs/xfs/xfs_super.c:1755
 mount_bdev+0x304/0x3c0 fs/super.c:1408
 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1803
 legacy_get_tree+0x113/0x220 fs/fs_context.c:651
 vfs_get_tree+0x8f/0x380 fs/super.c:1483
 do_new_mount fs/namespace.c:2791 [inline]
 do_mount+0x13b3/0x1c30 fs/namespace.c:3111
 ksys_mount+0xdb/0x150 fs/namespace.c:3320
 __do_sys_mount fs/namespace.c:3334 [inline]
 __se_sys_mount fs/namespace.c:3331 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c27a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d 8d fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7a 8d fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fe3882fba88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe3882fbb40 RCX: 000000000045c27a
RDX: 00007fe3882fbae0 RSI: 00000000200000c0 RDI: 00007fe3882fbb00
RBP: 0000000000000000 R08: 00007fe3882fbb40 R09: 00007fe3882fbae0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003
R13: 00000000004c8925 R14: 00000000004df5b0 R15: 00000000ffffffff
kobject: 'loop4' (000000000a818a88): kobject_uevent_env
kobject: 'loop4' (000000000a818a88): fill_kobj_path: path = '/devices/virtual/block/loop4'