RBP: 00007f3ceae7f090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f3cea1b5fa0 R15: 00007ffe94f79a58 ===================================== WARNING: bad unlock balance detected! 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 Tainted: G U ------------------------------------- syz.6.4018/15533 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.6.4018/15533: #0: ffff888035fb0b78 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2a2/0x370 fs/file.c:1213 #1: ffff88807530d9e0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182 stack backtrace: CPU: 0 UID: 0 PID: 15533 Comm: syz.6.4018 Tainted: G U 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #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 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/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3ce9f8e169 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:00007f3ceae7f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f3cea1b5fa0 RCX: 00007f3ce9f8e169 RDX: 0000000000001000 RSI: 00002000000004c0 RDI: 0000000000000003 RBP: 00007f3ceae7f090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f3cea1b5fa0 R15: 00007ffe94f79a58