syzbot


BUG: Dentry still in use [unmount of incremental-fs incremental-fs]

Status: closed as dup on 2021/10/28 13:08
Reported-by: syzbot+071ab14a1baa5064684a@syzkaller.appspotmail.com
First crash: 519d, last: 519d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
BUG: Dentry still in use [unmount of ramfs ramfs] C error 3 522d 524d
similar bugs (4):
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 483d 522d 0/2 closed as dup on 2021/10/28 13:08
android-5-10 BUG: Dentry still in use in unmount C done 1184 399d 412d 2/2 fixed on 2022/02/25 03:20
android-54 BUG: Dentry still in use [unmount of ramfs ramfs] C 476 418d 740d 0/2 upstream: reported C repro on 2021/03/19 07:18
android-54 BUG: Dentry still in use [unmount of incremental-fs incremental-fs] C 13 519d 789d 0/2 upstream: reported C repro on 2021/01/29 12:48

Sample crash report:
BUG: Dentry ffff88811f726990{i=0,n=.index}  still in use (1) [unmount of incremental-fs incremental-fs]
------------[ cut here ]------------
WARNING: CPU: 1 PID: 374 at fs/dcache.c:1616 umount_check+0x18d/0x1d0 fs/dcache.c:1607
Modules linked in:
CPU: 1 PID: 374 Comm: syz-executor.0 Not tainted 5.10.75-syzkaller-01082-g234d53d2bb60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:umount_check+0x18d/0x1d0 fs/dcache.c:1607
Code: 8b 0b 49 81 c6 f8 03 00 00 48 c7 c7 40 43 2e 85 4c 89 e6 48 8b 55 d0 4c 89 e1 45 89 f8 31 c0 41 56 e8 ae d9 9e ff 48 83 c4 08 <0f> 0b e9 f1 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c c9 fe ff
RSP: 0018:ffffc90000b57c90 EFLAGS: 00010296
RAX: 0000000000000067 RBX: ffffffff866d6180 RCX: 26f74b42d28c7c00
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: ffffc90000b57cc0 R08: ffffffff81545368 R09: fffff5200016aebd
R10: fffff5200016aebd R11: 0000000000000000 R12: ffff88811f726990
R13: dffffc0000000000 R14: ffff88810b6943f8 R15: 0000000000000001
FS:  000055555623b400(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556244b38 CR3: 0000000106bcb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 d_walk+0x309/0x540 fs/dcache.c:1326
 do_one_tree fs/dcache.c:1623 [inline]
 shrink_dcache_for_umount+0x8e/0x1b0 fs/dcache.c:1639
 generic_shutdown_super+0x66/0x2c0 fs/super.c:447
 incfs_kill_sb+0x41/0x50 fs/incfs/vfs.c:1882
 deactivate_locked_super+0xb0/0x100 fs/super.c:335
 deactivate_super+0xa5/0xd0 fs/super.c:366
 cleanup_mnt+0x45f/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x147/0x1b0 kernel/task_work.c:154
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0xc3/0xe0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:266
 do_syscall_64+0x3d/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f0933dbaea7
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff46743f38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f0933dbaea7
RDX: 00007fff4674400b RSI: 0000000000000002 RDI: 00007fff46744000
RBP: 00007fff46744000 R08: 00000000ffffffff R09: 00007fff46743dd0
R10: 000055555623cb83 R11: 0000000000000246 R12: 00007f0933e13035
R13: 00007fff467450c0 R14: 000055555623cb00 R15: 00007fff46745100
---[ end trace 88ff8956c9e467ff ]---
VFS: Busy inodes after unmount of incremental-fs. Self-destruct in 5 seconds.  Have a nice day...

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-android-5-10 2021/10/26 23:28 android12-5.10-lts 234d53d2bb60 d50eb50a .config console log report syz BUG: Dentry still in use [unmount of incremental-fs incremental-fs]
ci2-android-5-10 2021/10/26 15:26 android12-5.10-lts 234d53d2bb60 d50eb50a .config console log report info BUG: Dentry still in use [unmount of incremental-fs incremental-fs]
* Struck through repros no longer work on HEAD.