general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 PID: 4645 Comm: syz-executor.1 Not tainted 5.18.0-syzkaller-13842-g952923ddc011 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:snd_virmidi_output_trigger+0x82/0x130 sound/core/seq/seq_virmidi.c:169
Code: 8b ad 30 01 00 00 31 ff 89 de e8 d9 8b 4f fa 85 db 48 b8 00 00 00 00 00 fc ff df 41 0f 95 c4 48 8d 7d 1c 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 60 31 ff 44 88
RSP: 0018:ffffc9000cf3fc28 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff872af747
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 000000000000001c
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888020909c01
R13: 000000007fc88000 R14: ffff88814a459900 R15: 0000000000001000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0063) knlGS:00000000f7faeb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020376000 CR3: 00000000202c7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 snd_rawmidi_output_trigger sound/core/rawmidi.c:186 [inline]
 snd_rawmidi_output_trigger sound/core/rawmidi.c:182 [inline]
 snd_rawmidi_kernel_write1+0x548/0x870 sound/core/rawmidi.c:1502
 snd_rawmidi_write+0x273/0xb90 sound/core/rawmidi.c:1555
 vfs_write+0x269/0xac0 fs/read_write.c:589
 ksys_write+0x1e8/0x250 fs/read_write.c:644
 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+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x53/0x62
RIP: 0023:0xf7fb3549
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:00000000f7fae5cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000000
RDX: 00000000fffffd2c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:snd_virmidi_output_trigger+0x82/0x130 sound/core/seq/seq_virmidi.c:169
Code: 8b ad 30 01 00 00 31 ff 89 de e8 d9 8b 4f fa 85 db 48 b8 00 00 00 00 00 fc ff df 41 0f 95 c4 48 8d 7d 1c 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 60 31 ff 44 88
RSP: 0018:ffffc9000cf3fc28 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff872af747
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 000000000000001c
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888020909c01
R13: 000000007fc88000 R14: ffff88814a459900 R15: 0000000000001000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0063) knlGS:00000000f7faeb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002f424000 CR3: 00000000202c7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8b ad 30 01 00 00    	mov    0x130(%rbp),%ebp
   6:	31 ff                	xor    %edi,%edi
   8:	89 de                	mov    %ebx,%esi
   a:	e8 d9 8b 4f fa       	callq  0xfa4f8be8
   f:	85 db                	test   %ebx,%ebx
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	41 0f 95 c4          	setne  %r12b
  1f:	48 8d 7d 1c          	lea    0x1c(%rbp),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	48 89 fa             	mov    %rdi,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	38 d0                	cmp    %dl,%al
  36:	7f 04                	jg     0x3c
  38:	84 c0                	test   %al,%al
  3a:	75 60                	jne    0x9c
  3c:	31 ff                	xor    %edi,%edi
  3e:	44                   	rex.R
  3f:	88                   	.byte 0x88