RSP: 002b:00007f4851e31038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f48511a5fa0 RCX: 00007f4850f8d169 RDX: 000000000000005a RSI: 0000200000000780 RDI: 0000000000000003 RBP: 00007f4851e31090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f48511a5fa0 R15: 00007ffffc30f858 ===================================== WARNING: bad unlock balance detected! 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 Not tainted ------------------------------------- syz.2.443/7747 is trying to release lock (event_mutex) at: [] seq_read_iter+0x60d/0x12c0 fs/seq_file.c:251 but there are no more locks to release! other info that might help us debug this: 2 locks held by syz.2.443/7747: #0: ffff888035182ef8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2a2/0x370 fs/file.c:1213 #1: ffff8880133831c8 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182 stack backtrace: CPU: 0 UID: 0 PID: 7747 Comm: syz.2.443 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full) 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 seq_read_iter+0x60d/0x12c0 fs/seq_file.c:251 seq_read+0x39e/0x4e0 fs/seq_file.c:162 vfs_read+0x1de/0xc70 fs/read_write.c:568 ksys_read+0x12a/0x240 fs/read_write.c:713 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: 0033:0x7f4850f8d169 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:00007f4851e31038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f48511a5fa0 RCX: 00007f4850f8d169 RDX: 000000000000005a RSI: 0000200000000780 RDI: 0000000000000003 RBP: 00007f4851e31090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f48511a5fa0 R15: 00007ffffc30f858