------------[ cut here ]------------
BUG?
WARNING: CPU: 3 PID: 5695 at sound/usb/midi.c:1137 snd_usbmidi_output_open+0xdc/0x410 sound/usb/midi.c:1137
Modules linked in:
CPU: 3 PID: 5695 Comm: syz-executor.2 Not tainted 6.1.0-rc5-syzkaller-00103-g81ac25651a62 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:snd_usbmidi_output_open+0xdc/0x410 sound/usb/midi.c:1137
Code: 3c 02 00 0f 85 03 03 00 00 4d 8b be 10 02 00 00 4d 85 ff 0f 85 c8 00 00 00 e8 60 73 da f9 48 c7 c7 a0 a4 58 8b e8 41 4f 05 02 <0f> 0b 41 bc fa ff ff ff e8 47 73 da f9 44 89 e0 48 83 c4 08 5b 5d
RSP: 0018:ffffc9000706f378 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888026a39000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff816574fc RDI: fffff52000e0de61
RBP: ffff8880152c8900 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffff8880482b2800
R13: 0000000000000000 R14: ffff888042e79000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802c600000(0063) knlGS:00000000f7fd7b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000c0043e3000 CR3: 000000006a588000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 open_substream+0x41d/0x8c0 sound/core/rawmidi.c:344
 rawmidi_open_priv+0x591/0x6f0 sound/core/rawmidi.c:394
 snd_rawmidi_kernel_open+0x1b9/0x270 sound/core/rawmidi.c:429
 midisynth_use+0xf2/0x270 sound/core/seq/seq_midi.c:215
 subscribe_port sound/core/seq/seq_ports.c:412 [inline]
 check_and_subscribe_port+0x89a/0xb80 sound/core/seq/seq_ports.c:495
 snd_seq_port_connect+0x386/0x550 sound/core/seq/seq_ports.c:581
 snd_seq_ioctl_subscribe_port+0x200/0x400 sound/core/seq/seq_clientmgr.c:1490
 snd_seq_kernel_client_ctl+0x106/0x1c0 sound/core/seq/seq_clientmgr.c:2367
 snd_seq_oss_midi_open+0x586/0x6e0 sound/core/seq/oss/seq_oss_midi.c:361
 snd_seq_oss_synth_setup_midi+0x131/0x540 sound/core/seq/oss/seq_oss_synth.c:269
 snd_seq_oss_open+0x8bc/0xa70 sound/core/seq/oss/seq_oss_init.c:260
 odev_open+0x70/0x90 sound/core/seq/oss/seq_oss.c:128
 soundcore_open+0x452/0x620 sound/sound_core.c:593
 chrdev_open+0x26a/0x770 fs/char_dev.c:414
 do_dentry_open+0x6cc/0x13f0 fs/open.c:882
 do_open fs/namei.c:3557 [inline]
 path_openat+0x1bf6/0x2860 fs/namei.c:3713
 do_filp_open+0x1ba/0x410 fs/namei.c:3740
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_compat_sys_openat fs/open.c:1386 [inline]
 __se_compat_sys_openat fs/open.c:1384 [inline]
 __ia32_compat_sys_openat+0x143/0x1f0 fs/open.c:1384
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7fdc549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7fd75cc EFLAGS: 00000296 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000020000080
RDX: 0000000000020983 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	03 74 c0 01          	add    0x1(%rax,%rax,8),%esi
   4:	10 05 03 74 b8 01    	adc    %al,0x1b87403(%rip)        # 0x1b8740d
   a:	10 06                	adc    %al,(%rsi)
   c:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
  10:	10 07                	adc    %al,(%rdi)
  12:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
  16:	10 08                	adc    %cl,(%rax)
  18:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1c:	00 00                	add    %al,(%rax)
  1e:	00 00                	add    %al,(%rax)
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	retq
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  39:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi