| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <67bf882e.050a0220.1ebef.008f.GAE@google.com>
Date: Wed, 26 Feb 2025 13:31:26 -0800
From: syzbot <syzbot+0b16dd9bd622c40b2bbe@...kaller.appspotmail.com>
To: brauner@...nel.org, jack@...e.cz, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
viro@...iv.linux.org.uk
Subject: [syzbot] [fs?] WARNING: bad unlock balance in traverse
Hello,
syzbot found the following issue on:
HEAD commit: ac9c34d1e45a Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=165b9c98580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b1635bf4c5557b92
dashboard link: https://syzkaller.appspot.com/bug?extid=0b16dd9bd622c40b2bbe
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=152b003f980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ed21c75da715/disk-ac9c34d1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f51096fe566c/vmlinux-ac9c34d1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e6a27961fbbe/bzImage-ac9c34d1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0b16dd9bd622c40b2bbe@...kaller.appspotmail.com
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdab0827c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007f06103a5fa0 RCX: 00007f061018d169
RDX: 0000000000000400 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffdab082820 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009871 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f06103a5fa0 R14: 00007f06103a5fa0 R15: 0000000000000004
</TASK>
=====================================
WARNING: bad unlock balance detected!
6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0 Not tainted
-------------------------------------
syz.0.17/6067 is trying to release lock (event_mutex) at:
[<ffffffff82399e2d>] traverse.part.0.constprop.0+0x2bd/0x640 fs/seq_file.c:131
but there are no more locks to release!
other info that might help us debug this:
1 lock held by syz.0.17/6067:
#0: ffff888032e872f0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
stack backtrace:
CPU: 1 UID: 0 PID: 6067 Comm: syz.0.17 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_unlock_imbalance_bug kernel/locking/lockdep.c:5289 [inline]
print_unlock_imbalance_bug+0x1aa/0x1f0 kernel/locking/lockdep.c:5263
__lock_release kernel/locking/lockdep.c:5528 [inline]
lock_release+0x525/0x6f0 kernel/locking/lockdep.c:5872
__mutex_unlock_slowpath+0xa3/0x6a0 kernel/locking/mutex.c:891
traverse.part.0.constprop.0+0x2bd/0x640 fs/seq_file.c:131
traverse fs/seq_file.c:98 [inline]
seq_read_iter+0x934/0x12b0 fs/seq_file.c:195
seq_read+0x39f/0x4e0 fs/seq_file.c:162
vfs_read+0x1df/0xbf0 fs/read_write.c:563
ksys_pread64 fs/read_write.c:756 [inline]
__do_sys_pread64 fs/read_write.c:764 [inline]
__se_sys_pread64 fs/read_write.c:761 [inline]
__x64_sys_pread64+0x1f6/0x250 fs/read_write.c:761
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f061018d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdab0827c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007f06103a5fa0 RCX: 00007f061018d169
RDX: 0000000000000400 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffdab082820 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009871 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f06103a5fa0 R14: 00007f06103a5fa0 R15: 0000000000000004
</TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
0: ff c3 inc %ebx
2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
9: 00 00 00
c: 0f 1f 40 00 nopl 0x0(%rax)
10: 48 89 f8 mov %rdi,%rax
13: 48 89 f7 mov %rsi,%rdi
16: 48 89 d6 mov %rdx,%rsi
19: 48 89 ca mov %rcx,%rdx
1c: 4d 89 c2 mov %r8,%r10
1f: 4d 89 c8 mov %r9,%r8
22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
27: 0f 05 syscall
* 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
2f: 73 01 jae 0x32
31: c3 ret
32: 48 c7 c1 a8 ff ff ff mov $0xffffffffffffffa8,%rcx
39: f7 d8 neg %eax
3b: 64 89 01 mov %eax,%fs:(%rcx)
3e: 48 rex.W
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Powered by blists - more mailing lists