BUG: Dentry ffff8881e5821990{i=0,n=.index} still in use (1) [unmount of vfat loop1]
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1471 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588
Modules linked in:
CPU: 1 PID: 1471 Comm: syz-executor.1 Not tainted 5.4.125-syzkaller-00007-g299ecc4fc137 #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 20 09 e9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 37 a2 af 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:ffff8881aa3afc58 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffffffff85fc5e40 RCX: 0548f131a5274800
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8881ef0ec420 R08: ffffffff814e90d7 R09: ffffed103ede9608
R10: ffffed103ede9608 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881e5821990
FS: 00000000028ba400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeb79e5f88 CR3: 00000001a9d2f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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
kill_block_super+0x79/0xd0 fs/super.c:1444
deactivate_locked_super+0xaf/0x100 fs/super.c:335
deactivate_super+0x1b3/0x270 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: 0033:0x467a47
Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 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:00007ffeb79e61e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a47
RDX: 00007ffeb79e62bb RSI: 0000000000000002 RDI: 00007ffeb79e62b0
RBP: 00007ffeb79e62b0 R08: 00000000ffffffff R09: 00007ffeb79e6080
R10: 00000000028bbbd3 R11: 0000000000000246 R12: 00000000004bee90
R13: 00007ffeb79e7380 R14: 00000000028bbb00 R15: 00007ffeb79e73c0
---[ end trace 4c7f8ee36203060c ]---
BUG: Dentry ffff888196745aa0{i=0,n=.index} still in use (1) [unmount of vfat loop1]
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1471 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588
Modules linked in:
CPU: 1 PID: 1471 Comm: syz-executor.1 Tainted: G W 5.4.125-syzkaller-00007-g299ecc4fc137 #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 20 09 e9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 37 a2 af 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:ffff8881aa3afc58 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffffffff85fc5e40 RCX: 0548f131a5274800
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8881ef0ec420 R08: ffffffff814e90d7 R09: ffffed103ede9608
R10: ffffed103ede9608 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffff888196745aa0
FS: 00000000028ba400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeb79e5f88 CR3: 00000001a9d2f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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
kill_block_super+0x79/0xd0 fs/super.c:1444
deactivate_locked_super+0xaf/0x100 fs/super.c:335
deactivate_super+0x1b3/0x270 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: 0033:0x467a47
Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 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:00007ffeb79e61e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a47
RDX: 00007ffeb79e62bb RSI: 0000000000000002 RDI: 00007ffeb79e62b0
RBP: 00007ffeb79e62b0 R08: 00000000ffffffff R09: 00007ffeb79e6080
R10: 00000000028bbbd3 R11: 0000000000000246 R12: 00000000004bee90
R13: 00007ffeb79e7380 R14: 00000000028bbb00 R15: 00007ffeb79e73c0
---[ end trace 4c7f8ee36203060d ]---
VFS: Busy inodes after unmount of loop1. Self-destruct in 5 seconds. Have a nice day...
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Code disassembly (best guess):
0: ff 4c 8b 0b decl 0xb(%rbx,%rcx,4)
4: 48 81 c5 20 04 00 00 add $0x420,%rbp
b: 48 c7 c7 20 09 e9 84 mov $0xffffffff84e90920,%rdi
12: 4c 89 fe mov %r15,%rsi
15: 4c 89 f2 mov %r14,%rdx
18: 4c 89 f9 mov %r15,%rcx
1b: 45 89 e8 mov %r13d,%r8d
1e: 31 c0 xor %eax,%eax
20: 55 push %rbp
21: e8 37 a2 af ff callq 0xffafa25d
26: 48 83 c4 08 add $0x8,%rsp
2a: 0f 0b ud2 <-- trapping instruction
2c: e9 fd fe ff ff jmpq 0xffffff2e
31: 89 e9 mov %ebp,%ecx
33: 80 e1 07 and $0x7,%cl
36: 80 c1 03 add $0x3,%cl
39: 38 c1 cmp %al,%cl
3b: 0f .byte 0xf
3c: 8c d4 mov %ss,%esp
3e: fe (bad)
3f: ff .byte 0xff