WARNING: CPU: 1 PID: 14219 at sound/core/rawmidi.c:1163 __snd_rawmidi_transmit_ack+0x263/0x2f0 sound/core/rawmidi.c:1163
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 14219 Comm: syz-executor2 Not tainted 4.18.0-rc4+ #51
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+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x252/0x2d0 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:992
RIP: 0010:__snd_rawmidi_transmit_ack+0x263/0x2f0 sound/core/rawmidi.c:1163
Code: ba 01 00 00 00 be 03 00 00 00 e8 88 4a 83 fb e8 43 fe a2 fb 89 d8 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 2d fe a2 fb <0f> 0b e9 72 fe ff ff e8 e1 dc e0 fb e9 1b ff ff ff bb ea ff ff ff 
RSP: 0018:ffff88018568f720 EFLAGS: 00010046
RAX: 0000000000040000 RBX: 0000000000000002 RCX: ffffc9000524e000
RDX: 0000000000040000 RSI: ffffffff85d90d13 RDI: 0000000000000006
RBP: ffff88018568f760 R08: ffff8801d80d83c0 R09: ffffed0039187884
R10: ffffed0039187884 R11: ffff8801c8c3c423 R12: ffff8801cd6456c0
R13: 0000000000000802 R14: 0000000000000002 R15: ffff88019f32ec80
 snd_virmidi_output_trigger+0x3ae/0x6b0 sound/core/seq/seq_virmidi.c:194
 snd_rawmidi_output_trigger sound/core/rawmidi.c:150 [inline]
 snd_rawmidi_kernel_write1+0x519/0x700 sound/core/rawmidi.c:1288
 snd_rawmidi_write+0x2ea/0xde0 sound/core/rawmidi.c:1338
 __vfs_write+0x117/0x9f0 fs/read_write.c:485
 vfs_write+0x1f8/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __ia32_sys_write+0x71/0xb0 fs/read_write.c:607
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f67cb9
Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f5f210ac EFLAGS: 00000282 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 00000000200000c0
RDX: 000000000000ff4c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..