syzbot


WARNING: bad unlock balance in ext4_rename2

Status: auto-obsoleted due to no activity on 2023/06/20 08:44
Reported-by: syzbot+9e83328b70294112a149@syzkaller.appspotmail.com
First crash: 399d, last: 395d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: bad unlock balance in ext4_rename2 ext4 105 393d 411d 22/26 fixed on 2023/06/08 14:41
linux-6.1 WARNING: bad unlock balance in ext4_rename2 21 395d 400d 0/3 auto-obsoleted due to no activity on 2023/06/20 09:41

Sample crash report:
EXT4-fs (loop4): 1 orphan inode deleted
EXT4-fs (loop4): mounted filesystem without journal. Opts: errors=remount-ro,orlov,noload,dioread_lock,stripe=0x000. Quota mode: writeback.
=====================================
WARNING: bad unlock balance detected!
5.15.103-syzkaller #0 Not tainted
-------------------------------------
syz-executor.4/4122 is trying to release lock (&type->i_mutex_dir_key) at:
[<ffffffff82241f34>] inode_unlock include/linux/fs.h:792 [inline]
[<ffffffff82241f34>] ext4_rename fs/ext4/namei.c:4036 [inline]
[<ffffffff82241f34>] ext4_rename2+0x3c04/0x42d0 fs/ext4/namei.c:4209
but there are no more locks to release!

other info that might help us debug this:
2 locks held by syz-executor.4/4122:
 #0: ffff888077620460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
 #1: ffff888084c7e7a0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: lock_rename+0x182/0x1a0

stack backtrace:
CPU: 1 PID: 4122 Comm: syz-executor.4 Not tainted 5.15.103-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_unlock_imbalance_bug+0x248/0x2b0 kernel/locking/lockdep.c:5064
 __lock_release kernel/locking/lockdep.c:5301 [inline]
 lock_release+0x5ff/0x9d0 kernel/locking/lockdep.c:5642
 up_write+0x75/0x4d0 kernel/locking/rwsem.c:1593
 inode_unlock include/linux/fs.h:792 [inline]
 ext4_rename fs/ext4/namei.c:4036 [inline]
 ext4_rename2+0x3c04/0x42d0 fs/ext4/namei.c:4209
 vfs_rename+0xd8f/0x1190 fs/namei.c:4736
 do_renameat2+0xb97/0x13b0 fs/namei.c:4887
 __do_sys_renameat2 fs/namei.c:4920 [inline]
 __se_sys_renameat2 fs/namei.c:4917 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4917
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f0e9dcd90f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f0e9c24b168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f0e9ddf8f80 RCX: 00007f0e9dcd90f9
RDX: 0000000000000005 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007f0e9dd34b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffba7204ef R14: 00007f0e9c24b300 R15: 0000000000022000
 </TASK>
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff8880700a2b60, owner = 0x0, curr 0xffff888077e15700, list empty
WARNING: CPU: 0 PID: 4122 at kernel/locking/rwsem.c:1342 __up_write kernel/locking/rwsem.c:1341 [inline]
WARNING: CPU: 0 PID: 4122 at kernel/locking/rwsem.c:1342 up_write+0x473/0x4d0 kernel/locking/rwsem.c:1594
Modules linked in:
CPU: 0 PID: 4122 Comm: syz-executor.4 Not tainted 5.15.103-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:__up_write kernel/locking/rwsem.c:1341 [inline]
RIP: 0010:up_write+0x473/0x4d0 kernel/locking/rwsem.c:1594
Code: 48 c7 c7 00 f0 8a 8a 48 c7 c6 c0 f2 8a 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 a1 f9 e9 ff 48 83 c4 08 <0f> 0b e9 86 fd ff ff 48 c7 c1 48 bc e3 8d 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900078a76e0 EFLAGS: 00010292
RAX: 41b3471d78138a00 RBX: ffffffff8a8af0e0 RCX: 0000000000040000
RDX: ffffc9000c7c3000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc900078a77b0 R08: ffffffff8166a76c R09: ffffed10173467a0
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff8880700a2b60 R14: 1ffff92000f14ee4 R15: dffffc0000000000
FS:  00007f0e9c24b700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020420000 CR3: 0000000075397000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:792 [inline]
 ext4_rename fs/ext4/namei.c:4036 [inline]
 ext4_rename2+0x3c04/0x42d0 fs/ext4/namei.c:4209
 vfs_rename+0xd8f/0x1190 fs/namei.c:4736
 do_renameat2+0xb97/0x13b0 fs/namei.c:4887
 __do_sys_renameat2 fs/namei.c:4920 [inline]
 __se_sys_renameat2 fs/namei.c:4917 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4917
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f0e9dcd90f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f0e9c24b168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f0e9ddf8f80 RCX: 00007f0e9dcd90f9
RDX: 0000000000000005 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007f0e9dd34b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffba7204ef R14: 00007f0e9c24b300 R15: 0000000000022000
 </TASK>

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/22 08:43 linux-5.15.y 8020ae3c051d 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/22 07:28 linux-5.15.y 8020ae3c051d 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/22 07:07 linux-5.15.y 8020ae3c051d 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/20 07:46 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/19 15:35 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/22 01:11 linux-5.15.y 8020ae3c051d 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/21 23:04 linux-5.15.y 8020ae3c051d 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/21 17:10 linux-5.15.y 8020ae3c051d 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/21 12:38 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 18:52 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 18:30 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 16:24 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 16:06 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 15:41 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 15:14 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 03:44 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
* Struck through repros no longer work on HEAD.