WARNING: CPU: 1 PID: 19332 at sound/core/seq/seq_ports.c:275 port_delete+0x13c/0x170 sound/core/seq/seq_ports.c:276
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 19332 Comm: syz-executor1 Not tainted 4.18.0-rc1+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x16e/0x22a lib/dump_stack.c:113
 panic+0x1c6/0x37d kernel/panic.c:184
 __warn.cold.8+0x120/0x16c kernel/panic.c:536
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:port_delete+0x13c/0x170 sound/core/seq/seq_ports.c:275
Code: 03 0f b6 04 02 84 c0 74 04 3c 03 7e 21 8b 83 58 01 00 00 85 c0 75 0f 48 89 df e8 5f 33 15 fc 31 c0 5b 41 5c 5d c3 0f 0b eb ed <0f> 0b eb bb e8 5b 5f 15 fc eb d8 e8 54 5f 15 fc eb a6 e8 ad 5f 15 
RSP: 0018:ffff8801b9707898 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8801cede0940 RCX: 1ffff100378b79d3
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8801cede09b8
RBP: ffff8801b97078a8 R08: ffff8801bc5bce98 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801bc5bc600 R12: ffffffff859d4010
R13: 1ffff100372e0f1d R14: ffff8801cede0940 R15: ffff8801cb005810
 snd_seq_delete_port+0x33c/0x5e0 sound/core/seq/seq_ports.c:303
 snd_seq_ioctl_delete_port+0xa0/0x170 sound/core/seq/seq_clientmgr.c:1325
 snd_seq_kernel_client_ctl+0xe3/0x150 sound/core/seq/seq_clientmgr.c:2360
 snd_seq_event_port_detach+0xf1/0x160 sound/core/seq/seq_ports.c:705
 delete_port+0x66/0xa0 sound/core/seq/oss/seq_oss_init.c:354
 snd_seq_oss_release+0xda/0x110 sound/core/seq/oss/seq_oss_init.c:433
 odev_release+0x49/0x70 sound/core/seq/oss/seq_oss.c:153
 __fput+0x2ec/0x990 fs/file_table.c:209
 ____fput+0x9/0x10 fs/file_table.c:243
 task_work_run+0x19f/0x240 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop+0x267/0x300 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x587/0x700 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4576c9
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fcfe0639c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000004576c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcfe063a6d4
R13: 00000000004ef9b2 R14: 00000000004cc500 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..