Hello, syzbot found the following issue on: HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=127f4518580000 kernel config: https://syzkaller.appspot.com/x/.config?x=98d83cc1742b7377 dashboard link: https://syzkaller.appspot.com/bug?extid=c041985778e4069e1ce3 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=1493f6b0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13c2dddf980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3d07b0558b0e/disk-69e858e0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e5e2250eb3b1/vmlinux-69e858e0.xz kernel image: https://storage.googleapis.com/syzbot-assets/3e676d17effc/bzImage-69e858e0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c041985778e4069e1ce3@xxxxxxxxxxxxxxxxxxxxxxxxx Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe566caee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffe566caef0 RCX: 00007f1f6401a2e9 RDX: 0000000000006c64 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007ffe566cac87 R09: 00007f1f64080032 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f1f64085618 R13: 00007ffe566cb0c8 R14: 0000000000000001 R15: 0000000000000001 </TASK> ===================================== WARNING: bad unlock balance detected! 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Not tainted ------------------------------------- syz-executor359/5828 is trying to release lock (event_mutex) at: [<ffffffff8239231f>] seq_read_iter+0x5ff/0x12b0 fs/seq_file.c:251 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor359/5828: #0: ffff88802fd120a0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182 stack backtrace: CPU: 0 UID: 0 PID: 5828 Comm: syz-executor359 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 seq_read_iter+0x5ff/0x12b0 fs/seq_file.c:251 seq_read+0x39f/0x4e0 fs/seq_file.c:162 vfs_read+0x1df/0xbf0 fs/read_write.c:563 ksys_read+0x12b/0x250 fs/read_write.c:708 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: 0033:0x7f1f6401a2e9 Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe566caee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffe566caef0 RCX: 00007f1f6401a2e9 RDX: 0000000000006c64 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007ffe566cac87 R09: 00007f1f64080032 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f1f64085618 R13: 00007ffe566 ---------------- Code disassembly (best guess): 0: 48 83 c4 28 add $0x28,%rsp 4: c3 ret 5: e8 17 1a 00 00 call 0x1a21 a: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 c7 c1 b8 ff ff ff mov $0xffffffffffffffb8,%rcx 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 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@xxxxxxxxxxxxxxxx. 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
