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WARNING: CPU: 0 PID: 15581 at sound/core/seq/seq_ports.c:275 port_delete+0x177/0x1b0 sound/core/seq/seq_ports.c:275
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 15581 Comm: syz-executor0 Not tainted 4.19.0-rc6+ #46
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+0x1c4/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x254/0x2d0 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:993
RIP: 0010:port_delete+0x177/0x1b0 sound/core/seq/seq_ports.c:275
Code: f0 99 fb 45 85 e4 75 14 e8 36 ef 99 fb 48 89 df e8 de 23 dd fb 31 c0 5b 41 5c 5d c3 e8 22 ef 99 fb 0f 0b eb e3 e8 19 ef 99 fb <0f> 0b eb 9b e8 90 4f dd fb eb bd e8 89 4f dd fb e9 77 ff ff ff e8
RSP: 0018:ffff88017ffb7890 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff8801c6eb4dc0 RCX: ffffc900022e2000
RDX: 000000000000bfd4 RSI: ffffffff85e4c667 RDI: 0000000000000005
RBP: ffff88017ffb78a0 R08: ffff8801d8158040 R09: 0000000051263e88
R10: 000000000e801d88 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801c6eb4e10 R14: 1ffff1002fff6f20 R15: ffff8801cb8435c0
 snd_seq_delete_port+0x3cb/0x4a0 sound/core/seq/seq_ports.c:303
 snd_seq_ioctl_delete_port+0xba/0x190 sound/core/seq/seq_clientmgr.c:1324
 snd_seq_kernel_client_ctl+0x15a/0x190 sound/core/seq/seq_clientmgr.c:2353
 snd_seq_event_port_detach+0xfc/0x170 sound/core/seq/seq_ports.c:705
 delete_port+0x7d/0xc0 sound/core/seq/oss/seq_oss_init.c:354
 snd_seq_oss_release+0xf2/0x130 sound/core/seq/oss/seq_oss_init.c:433
 odev_release+0x52/0x70 sound/core/seq/oss/seq_oss.c:153
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x318/0x380 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+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
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:00007f5666e4cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000457579
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000e
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5666e4d6d4
R13: 00000000004ef912 R14: 00000000004cc460 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..