syzbot


BUG: Dentry still in use [unmount of vfat loop1]

Status: auto-closed as invalid on 2021/08/07 13:29
Reported-by: syzbot+c0ef1f5c8456354e4661@syzkaller.appspotmail.com
First crash: 1252d, last: 1141d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 BUG: Dentry still in use [unmount of ext4 loop0] C error 63 905d 943d 0/2 closed as dup on 2021/10/28 13:08
android-5-10 BUG: Dentry still in use [unmount of vfat loop1] 2 941d 943d 0/2 closed as dup on 2021/10/28 13:08
android-54 BUG: Dentry still in use [unmount of vfat loop1] (2) 2 966d 1015d 0/2 auto-closed as invalid on 2022/01/28 18:54

Sample crash report:
BUG: Dentry ffff88819ed30990{i=0,n=.index}  still in use (1) [unmount of vfat loop1]
------------[ cut here ]------------
WARNING: CPU: 1 PID: 374 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588
Modules linked in:
CPU: 1 PID: 374 Comm: syz-executor.1 Not tainted 5.4.109-syzkaller-00004-gb98c912db9ec #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 a0 ec e8 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 77 dc 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:ffff8881a7a1fc58 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffffffff85fc4de0 RCX: 62dd1f08ac3edc00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8881a0a5d420 R08: ffffffff814e8847 R09: ffffed103ede5e08
R10: ffffed103ede5e08 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffff88819ed30990
FS:  0000000002a80400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002a89b38 CR3: 00000001a7865000 CR4: 00000000001426e0
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: 0033:0x4678b7
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:00007fffb8383138 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004678b7
RDX: 00007fffb838320b RSI: 0000000000000002 RDI: 00007fffb8383200
RBP: 00007fffb8383200 R08: 00000000ffffffff R09: 00007fffb8382fd0
R10: 0000000002a81beb R11: 0000000000000246 R12: 00000000004bebb2
R13: 00007fffb83842d0 R14: 0000000002a81b00 R15: 00007fffb8384310
---[ end trace 9254dc03d8b7f0d6 ]---
BUG: Dentry ffff888192b3caa0{i=0,n=.index}  still in use (1) [unmount of vfat loop1]
------------[ cut here ]------------
WARNING: CPU: 1 PID: 374 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588
Modules linked in:
CPU: 1 PID: 374 Comm: syz-executor.1 Tainted: G        W         5.4.109-syzkaller-00004-gb98c912db9ec #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 a0 ec e8 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 77 dc 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:ffff8881a7a1fc58 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffffffff85fc4de0 RCX: 62dd1f08ac3edc00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8881a0a5d420 R08: ffffffff814e8847 R09: ffffed103ede5e08
R10: ffffed103ede5e08 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffff888192b3caa0
FS:  0000000002a80400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002a89b38 CR3: 00000001a7865000 CR4: 00000000001426e0
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: 0033:0x4678b7
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:00007fffb8383138 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004678b7
RDX: 00007fffb838320b RSI: 0000000000000002 RDI: 00007fffb8383200
RBP: 00007fffb8383200 R08: 00000000ffffffff R09: 00007fffb8382fd0
R10: 0000000002a81beb R11: 0000000000000246 R12: 00000000004bebb2
R13: 00007fffb83842d0 R14: 0000000002a81b00 R15: 00007fffb8384310
---[ end trace 9254dc03d8b7f0d7 ]---
VFS: Busy inodes after unmount of loop1. Self-destruct in 5 seconds.  Have a nice day...

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/04/09 13:29 android12-5.4 b98c912db9ec 6a81331a .config console log report info ci2-android-5-4-kasan BUG: Dentry still in use [unmount of vfat loop1]
2021/01/11 13:55 android12-5.4 c9951e5d80dd 2c1f2513 .config console log report info ci2-android-5-4-kasan
2020/12/27 03:00 android12-5.4 8657d5d6282f 821e0b09 .config console log report info ci2-android-5-4-kasan
2020/12/18 14:25 android12-5.4 cd5f5cb9fe67 04201c06 .config console log report info ci2-android-5-4-kasan
* Struck through repros no longer work on HEAD.