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:00007f9e39ccd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007f9e38fb5fa0 RCX: 00007f9e38d8e169 RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f9e39ccd090 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000005af R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f9e38fb5fa0 R15: 00007ffe2d6d3338 ===================================== WARNING: bad unlock balance detected! 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 Tainted: G U ------------------------------------- syz.3.2742/16952 is trying to release lock (event_mutex) at: [] 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.3.2742/16952: #0: ffff888046722668 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182 stack backtrace: CPU: 0 UID: 0 PID: 16952 Comm: syz.3.2742 Tainted: G U 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 PREEMPT(full) Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __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:5296 [inline] print_unlock_imbalance_bug+0x11b/0x130 kernel/locking/lockdep.c:5270 __lock_release kernel/locking/lockdep.c:5535 [inline] lock_release+0x242/0x2f0 kernel/locking/lockdep.c:5887 __mutex_unlock_slowpath+0xa2/0x6a0 kernel/locking/mutex.c:907 traverse.part.0.constprop.0+0x2bd/0x640 fs/seq_file.c:131 traverse fs/seq_file.c:98 [inline] seq_read_iter+0x932/0x12c0 fs/seq_file.c:195 seq_read+0x39e/0x4e0 fs/seq_file.c:162 vfs_read+0x1de/0xc70 fs/read_write.c:568 ksys_pread64 fs/read_write.c:761 [inline] __do_sys_pread64 fs/read_write.c:769 [inline] __se_sys_pread64 fs/read_write.c:766 [inline] __x64_sys_pread64+0x1f4/0x250 fs/read_write.c:766 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9e38d8e169 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:00007f9e39ccd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007f9e38fb5fa0 RCX: 00007f9e38d8e169 RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f9e39ccd090 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000005af R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f9e38fb5fa0 R15: 00007ffe2d6d3338 ---------------- 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