------------[ cut here ]------------ WARNING: CPU: 0 PID: 15302 at kernel/locking/lockdep.c:3322 __lock_acquire+0x1768/0x3640 kernel/locking/lockdep.c:3322 DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS)[ 102.244536] Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 15302 Comm: syz-executor2 Not tainted 4.9.61-ga93e312 #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 binder_alloc: binder_alloc_mmap_handler: 15301 20000000-20400000 already mapped failed -16 ffff8801c82bf4a8 ffffffff81d91589 ffffffff83a46ba0 ffff8801c82bf580 ffffffff83a5a300 ffffffff8123d238 0000000000000009 ffff8801c82bf570 ffffffff8142e391 0000000041b58ab3 ffffffff84185db0 ffffffff8142e1d5 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bc/0x3a8 kernel/panic.c:179 [] __warn+0x1c4/0x1e0 kernel/panic.c:542 [] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565 [] __lock_acquire+0x1768/0x3640 kernel/locking/lockdep.c:3322 [] lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756 [] __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] [] _raw_write_lock_irq+0x42/0x60 kernel/locking/spinlock.c:311 [] delete_and_unsubscribe_port+0x60/0x3a0 sound/core/seq/seq_ports.c:547 [] snd_seq_port_disconnect+0x1b7/0x230 sound/core/seq/seq_ports.c:630 [] snd_seq_ioctl_unsubscribe_port+0x212/0x2c0 sound/core/seq/seq_clientmgr.c:1488 [] snd_seq_kernel_client_ctl+0x122/0x160 sound/core/seq/seq_clientmgr.c:2349 [] snd_seq_oss_midi_close+0x363/0x590 sound/core/seq/oss/seq_oss_midi.c:416 [] snd_seq_oss_synth_reset+0x3cb/0x8b0 sound/core/seq/oss/seq_oss_synth.c:418 [] snd_seq_oss_reset+0x6c/0x260 sound/core/seq/oss/seq_oss_init.c:448 [] snd_seq_oss_release+0x71/0x130 sound/core/seq/oss/seq_oss_init.c:425 [] odev_release+0x52/0x70 sound/core/seq/oss/seq_oss.c:153 [] __fput+0x28c/0x6e0 fs/file_table.c:208 [] ____fput+0x15/0x20 fs/file_table.c:244 [] task_work_run+0x115/0x190 kernel/task_work.c:116 [] exit_task_work include/linux/task_work.h:21 [inline] [] do_exit+0x7e7/0x2a40 kernel/exit.c:833 [] do_group_exit+0x108/0x320 kernel/exit.c:937 [] SYSC_exit_group kernel/exit.c:948 [inline] [] SyS_exit_group+0x1d/0x20 kernel/exit.c:946 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..