BUG: Dentry 00000000fe188a97{i=1,n=/}  still in use (2) [unmount of sysfs sysfs]
WARNING: CPU: 1 PID: 7400 at fs/dcache.c:1528 umount_check.cold.51+0xd2/0x13f fs/dcache.c:1519
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7400 Comm: syz-executor.2 Not tainted 5.1.0+ #1
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+0x113/0x167 lib/dump_stack.c:113
 panic+0x212/0x40b kernel/panic.c:214
 __warn.cold.8+0x1b/0x38 kernel/panic.c:566
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:972
RIP: 0010:umount_check.cold.51+0xd2/0x13f fs/dcache.c:1528
Code: c1 ea 03 80 3c 02 00 75 79 49 81 c4 68 06 00 00 41 89 d8 48 89 f1 41 54 4d 8b 0e 4c 89 ea 48 c7 c7 20 b3 f4 86 e8 1b 6c ae ff <0f> 0b 58 e9 00 48 ff ff 48 89 75 d8 e8 6b a5 f2 ff 48 8b 75 d8 e9
RSP: 0018:ffff88808116fbe0 EFLAGS: 00010282
RAX: 0000000000000050 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff89b40c80
RBP: ffff88808116fc10 R08: ffffed1015d66011 R09: ffffed1015d66010
R10: ffffed1015d66010 R11: ffff8880aeb30087 R12: ffff88808e39e6e8
R13: 0000000000000001 R14: ffffffff88280bc0 R15: ffff8880a96b2b98
 d_walk+0x19b/0x6b0 fs/dcache.c:1263
 do_one_tree+0x1f/0x40 fs/dcache.c:1535
 shrink_dcache_for_umount+0x56/0x120 fs/dcache.c:1551
 generic_shutdown_super+0x61/0x330 fs/super.c:443
 kill_anon_super+0x38/0x60 fs/super.c:1137
 kernfs_kill_sb+0x145/0x1c3 fs/kernfs/mount.c:361
 sysfs_kill_sb+0x1a/0x30 fs/sysfs/mount.c:87
 deactivate_locked_super+0x77/0xd0 fs/super.c:331
 deactivate_super+0x136/0x150 fs/super.c:362
 cleanup_mnt+0xa3/0x140 fs/namespace.c:1120
 __cleanup_mnt+0xd/0x10 fs/namespace.c:1127
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x1a9/0x200 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:276 [inline]
 do_syscall_64+0x445/0x520 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x412fb1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff38f9d6b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000412fb1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007fff38f9d790 R11: 0000000000000293 R12: 00000000007601e0
R13: 000000000000fb27 R14: 000000000000fb54 R15: 000000000075bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..