BUG: Dentry ffff8881a73b7220{i=49f,n=.incomplete}  still in use (64) [unmount of incremental-fs incremental-fs]
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WARNING: CPU: 0 PID: 4039 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588
Modules linked in:
CPU: 0 PID: 4039 Comm: syz-executor.3 Not tainted 5.4.161-syzkaller-00053-gac3eac18e72e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:umount_check+0x179/0x1c0 fs/dcache.c:1588
Code: ff 4c 8b 0b 48 81 c5 20 04 00 00 48 c7 c7 60 1c c9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 47 23 b3 ff 48 83 c4 08 <0f> 0b e9 fd fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c d4 fe ff
RSP: 0018:ffff8881a8e17cb8 EFLAGS: 00010286
RAX: 000000000000006f RBX: ffffffff85de5820 RCX: 0b3621f45c3ab800
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8881ea5d7420 R08: ffffffff814b15ec R09: ffffed103edcaa08
R10: ffffed103edcaa08 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000040 R14: 000000000000049f R15: ffff8881a73b7220
FS:  0000555555fe0400(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 00000001e77f4000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 d_walk+0x2d9/0x540 fs/dcache.c:1307
 do_one_tree fs/dcache.c:1604 [inline]
 shrink_dcache_for_umount+0x8a/0x1a0 fs/dcache.c:1620
 generic_shutdown_super+0x63/0x2a0 fs/super.c:447
 incfs_kill_sb+0x47/0x70 fs/incfs/vfs.c:1907
 deactivate_locked_super+0xaf/0x100 fs/super.c:335
 deactivate_super+0x168/0x210 fs/super.c:366
 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102
 task_work_run+0x186/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fa1328c34c7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd61119268 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa1328c34c7
RDX: 00007ffd6111933b RSI: 000000000000000a RDI: 00007ffd61119330
RBP: 00007ffd61119330 R08: 00000000ffffffff R09: 00007ffd61119100
R10: 0000555555fe1ba3 R11: 0000000000000246 R12: 00007fa13291b1ea
R13: 00007ffd6111a3f0 R14: 0000555555fe1b00 R15: 00007ffd6111a430
---[ end trace e74eeaefa1bef74a ]---
BUG: Dentry ffff8881a73b7990{i=49e,n=.index}  still in use (64) [unmount of incremental-fs incremental-fs]
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WARNING: CPU: 0 PID: 4039 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588
Modules linked in:
CPU: 0 PID: 4039 Comm: syz-executor.3 Tainted: G        W         5.4.161-syzkaller-00053-gac3eac18e72e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:umount_check+0x179/0x1c0 fs/dcache.c:1588
Code: ff 4c 8b 0b 48 81 c5 20 04 00 00 48 c7 c7 60 1c c9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 47 23 b3 ff 48 83 c4 08 <0f> 0b e9 fd fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c d4 fe ff
RSP: 0018:ffff8881a8e17cb8 EFLAGS: 00010286
RAX: 000000000000006a RBX: ffffffff85de5820 RCX: 0b3621f45c3ab800
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8881ea5d7420 R08: ffffffff814b15ec R09: ffffed10351c2f4f
R10: ffffed10351c2f4f R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000040 R14: 000000000000049e R15: ffff8881a73b7990
FS:  0000555555fe0400(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 00000001e77f4000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 d_walk+0x2d9/0x540 fs/dcache.c:1307
 do_one_tree fs/dcache.c:1604 [inline]
 shrink_dcache_for_umount+0x8a/0x1a0 fs/dcache.c:1620
 generic_shutdown_super+0x63/0x2a0 fs/super.c:447
 incfs_kill_sb+0x47/0x70 fs/incfs/vfs.c:1907
 deactivate_locked_super+0xaf/0x100 fs/super.c:335
 deactivate_super+0x168/0x210 fs/super.c:366
 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102
 task_work_run+0x186/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fa1328c34c7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd61119268 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa1328c34c7
RDX: 00007ffd6111933b RSI: 000000000000000a RDI: 00007ffd61119330
RBP: 00007ffd61119330 R08: 00000000ffffffff R09: 00007ffd61119100
R10: 0000555555fe1ba3 R11: 0000000000000246 R12: 00007fa13291b1ea
R13: 00007ffd6111a3f0 R14: 0000555555fe1b00 R15: 00007ffd6111a430
---[ end trace e74eeaefa1bef74b ]---
VFS: Busy inodes after unmount of incremental-fs. Self-destruct in 5 seconds.  Have a nice day...