syzbot


WARNING: bad unlock balance in ext4_rename2

Status: auto-obsoleted due to no activity on 2023/06/20 09:41
Reported-by: syzbot+fb80287c88adff6883d6@syzkaller.appspotmail.com
First crash: 428d, last: 424d
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 421d 440d 22/26 fixed on 2023/06/08 14:41
linux-5.15 WARNING: bad unlock balance in ext4_rename2 16 424d 427d 0/3 auto-obsoleted due to no activity on 2023/06/20 08:44

Sample crash report:
EXT4-fs error (device loop2): ext4_xattr_inode_iget:394: comm syz-executor.2: error while reading EA inode 1 err=-117
EXT4-fs (loop2): 1 orphan inode deleted
EXT4-fs (loop2): mounted filesystem without journal. Quota mode: writeback.
=====================================
WARNING: bad unlock balance detected!
6.1.20-syzkaller #0 Not tainted
-------------------------------------
syz-executor.2/22293 is trying to release lock (&type->i_mutex_dir_key) at:
[<ffffffff8240908c>] inode_unlock include/linux/fs.h:761 [inline]
[<ffffffff8240908c>] ext4_rename fs/ext4/namei.c:4029 [inline]
[<ffffffff8240908c>] ext4_rename2+0x3dfc/0x4450 fs/ext4/namei.c:4202
but there are no more locks to release!

other info that might help us debug this:
2 locks held by syz-executor.2/22293:
 #0: ffff888081fe4460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
 #1: ffff888089704030 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename+0x182/0x1a0

stack backtrace:
CPU: 0 PID: 22293 Comm: syz-executor.2 Not tainted 6.1.20-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+0x24e/0x2c0 kernel/locking/lockdep.c:5109
 __lock_release kernel/locking/lockdep.c:5346 [inline]
 lock_release+0x638/0xab0 kernel/locking/lockdep.c:5689
 up_write+0x75/0x580 kernel/locking/rwsem.c:1625
 inode_unlock include/linux/fs.h:761 [inline]
 ext4_rename fs/ext4/namei.c:4029 [inline]
 ext4_rename2+0x3dfc/0x4450 fs/ext4/namei.c:4202
 vfs_rename+0xd8f/0x1190 fs/namei.c:4779
 do_renameat2+0xb97/0x13b0 fs/namei.c:4930
 __do_sys_renameat2 fs/namei.c:4963 [inline]
 __se_sys_renameat2 fs/namei.c:4960 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4960
 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+0x63/0xcd
RIP: 0033:0x7faf9788c0f9
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:00007faf9861f168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007faf979abf80 RCX: 00007faf9788c0f9
RDX: 0000000000000005 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007faf978e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff10e81eef R14: 00007faf9861f300 R15: 0000000000022000
 </TASK>
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88808755a1a8, owner = 0x0, curr 0xffff88808bc20000, list empty
WARNING: CPU: 0 PID: 22293 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 0 PID: 22293 at kernel/locking/rwsem.c:1372 up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 0 PID: 22293 Comm: syz-executor.2 Not tainted 6.1.20-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:__up_write kernel/locking/rwsem.c:1371 [inline]
RIP: 0010:up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Code: 48 c7 c7 00 c6 eb 8a 48 c7 c6 a0 c8 eb 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 ef f9 e8 ff 48 83 c4 08 <0f> 0b e9 71 fd ff ff 48 c7 c1 28 22 53 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000bd57660 EFLAGS: 00010296
RAX: 5f7da921974c2500 RBX: ffffffff8aebc6e0 RCX: 0000000000040000
RDX: ffffc9000c773000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc9000bd57730 R08: ffffffff8152ac2e R09: fffff520017aae45
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff88808755a1a8 R14: 1ffff920017aaed4 R15: dffffc0000000000
FS:  00007faf9861f700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30f27000 CR3: 000000008d600000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:761 [inline]
 ext4_rename fs/ext4/namei.c:4029 [inline]
 ext4_rename2+0x3dfc/0x4450 fs/ext4/namei.c:4202
 vfs_rename+0xd8f/0x1190 fs/namei.c:4779
 do_renameat2+0xb97/0x13b0 fs/namei.c:4930
 __do_sys_renameat2 fs/namei.c:4963 [inline]
 __se_sys_renameat2 fs/namei.c:4960 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4960
 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+0x63/0xcd
RIP: 0033:0x7faf9788c0f9
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:00007faf9861f168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007faf979abf80 RCX: 00007faf9788c0f9
RDX: 0000000000000005 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007faf978e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff10e81eef R14: 00007faf9861f300 R15: 0000000000022000
 </TASK>

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/22 09:40 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/22 05:58 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/22 05:11 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/22 05:05 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/19 23:39 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/19 21:26 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/19 15:37 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/19 03:45 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/17 23:23 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: bad unlock balance in ext4_rename2
2023/03/21 23:16 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/21 21:52 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/21 21:29 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/21 20:10 linux-6.1.y 7eaef76fbc46 8b4eb097 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 18:20 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 18:09 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 14:34 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/20 13:58 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 22:48 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 15:54 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 05:43 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
2023/03/19 05:43 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: bad unlock balance in ext4_rename2
* Struck through repros no longer work on HEAD.