BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop1] (2)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop1]				1	1452d	1452d	0/1	auto-closed as invalid on 2021/04/11 21:36
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f55f39aa000
RBP: 00007f55f39aa040 R08: 00007f55f39aa040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f55f39aa000 R15: 0000000020000080
erofs: blksize 8192 isn't supported on this platform
BUG: Dentry 0000000094c5af54{i=0,n=/}  still in use (-128) [unmount of erofs loop1]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7318 at fs/dcache.c:1518 umount_check fs/dcache.c:1518 [inline]
WARNING: CPU: 0 PID: 7318 at fs/dcache.c:1518 umount_check.cold+0xf2/0x116 fs/dcache.c:1499
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7318 Comm: syz-executor.1 Not tainted 4.19.195-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+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:umount_check fs/dcache.c:1518 [inline]
RIP: 0010:umount_check.cold+0xf2/0x116 fs/dcache.c:1499
Code: f9 4d 89 f1 45 89 e0 48 89 e9 41 55 4c 89 fa 48 89 ee 48 c7 c7 40 a6 74 88 e8 3b f0 fe ff 48 c7 c7 40 a5 74 88 e8 2f f0 fe ff <0f> 0b 58 e9 f0 b6 b4 f9 e8 1c 65 a4 f9 e9 22 ff ff ff 48 89 df e8
RSP: 0018:ffff888040f27a98 EFLAGS: 00010286
RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff814dfc91 RDI: ffffed10081e4f45
RBP: ffff8880295f3040 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 00000000ffffff80
R13: ffff88809b124690 R14: ffffffff893f91a0 R15: 0000000000000000
 d_walk+0x196/0x990 fs/dcache.c:1253
 do_one_tree fs/dcache.c:1525 [inline]
 shrink_dcache_for_umount+0x87/0x330 fs/dcache.c:1541
 generic_shutdown_super+0x68/0x370 fs/super.c:441
 kill_block_super+0x97/0xf0 fs/super.c:1185
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 mount_bdev+0x373/0x3b0 fs/super.c:1160
 erofs_mount+0x8c/0xc0 drivers/staging/erofs/super.c:512
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x113c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x467afa
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f55f39a9fa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467afa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f55f39aa000
RBP: 00007f55f39aa040 R08: 00007f55f39aa040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f55f39aa000 R15: 0000000020000080
Kernel Offset: disabled
Rebooting in 86400 seconds..