Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 2149 Comm: kworker/0:1H Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_highpri snd_vmidi_output_work
RIP: 0010:task_cpu include/linux/sched.h:2268 [inline]
RIP: 0010:is_task_rq_idle kernel/sched/core.c:6175 [inline]
RIP: 0010:cookie_equals kernel/sched/core.c:6180 [inline]
RIP: 0010:pick_next_task kernel/sched/core.c:6361 [inline]
RIP: 0010:__schedule+0x224f/0x6730 kernel/sched/core.c:7149
Code: 0f 85 5f 38 00 00 4d 8b ac 24 d0 0e 00 00 48 c7 c0 00 86 65 94 48 ba 00 00 00 00 00 fc ff df 49 8d 7d 14 48 89 f9 48 c1 e9 03 <0f> b6 0c 11 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 a2
RSP: 0018:ffffc9000d62f958 EFLAGS: 00010003
RAX: ffffffff94658600 RBX: 0000000000000001 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 1ffffffff1c8d924 RDI: 0000000000000014
RBP: ffffc9000d62fab0 R08: ffff88802b23c198 R09: fffffbfff224545a
R10: ffffffff9122a2d7 R11: 0000000000000000 R12: ffff88802b33b600
R13: 0000000000000000 R14: ffff888013a10700 R15: ffff88802b23b600
FS:  0000000000000000(0000) GS:ffff888096be3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080001000 CR3: 0000000025e17000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:198
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 class_spinlock_irqsave_destructor include/linux/spinlock.h:619 [inline]
 snd_rawmidi_transmit+0xf1/0x130 sound/core/rawmidi.c:1486
 snd_vmidi_output_work+0x111/0x390 sound/core/seq/seq_virmidi.c:151
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:task_cpu include/linux/sched.h:2268 [inline]
RIP: 0010:is_task_rq_idle kernel/sched/core.c:6175 [inline]
RIP: 0010:cookie_equals kernel/sched/core.c:6180 [inline]
RIP: 0010:pick_next_task kernel/sched/core.c:6361 [inline]
RIP: 0010:__schedule+0x224f/0x6730 kernel/sched/core.c:7149
Code: 0f 85 5f 38 00 00 4d 8b ac 24 d0 0e 00 00 48 c7 c0 00 86 65 94 48 ba 00 00 00 00 00 fc ff df 49 8d 7d 14 48 89 f9 48 c1 e9 03 <0f> b6 0c 11 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 a2
RSP: 0018:ffffc9000d62f958 EFLAGS: 00010003
RAX: ffffffff94658600 RBX: 0000000000000001 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 1ffffffff1c8d924 RDI: 0000000000000014
RBP: ffffc9000d62fab0 R08: ffff88802b23c198 R09: fffffbfff224545a
R10: ffffffff9122a2d7 R11: 0000000000000000 R12: ffff88802b33b600
R13: 0000000000000000 R14: ffff888013a10700 R15: ffff88802b23b600
FS:  0000000000000000(0000) GS:ffff888096be3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080001000 CR3: 0000000025e17000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	0f 85 5f 38 00 00    	jne    0x3865
   6:	4d 8b ac 24 d0 0e 00 	mov    0xed0(%r12),%r13
   d:	00
   e:	48 c7 c0 00 86 65 94 	mov    $0xffffffff94658600,%rax
  15:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  1c:	fc ff df
  1f:	49 8d 7d 14          	lea    0x14(%r13),%rdi
  23:	48 89 f9             	mov    %rdi,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	0f b6 0c 11          	movzbl (%rcx,%rdx,1),%ecx <-- trapping instruction
  2e:	48 89 fa             	mov    %rdi,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	83 c2 03             	add    $0x3,%edx
  37:	38 ca                	cmp    %cl,%dl
  39:	7c 08                	jl     0x43
  3b:	84 c9                	test   %cl,%cl
  3d:	0f                   	.byte 0xf
  3e:	85                   	.byte 0x85
  3f:	a2                   	.byte 0xa2