Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 1 UID: 0 PID: 75 Comm: kworker/1:1H Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_highpri f_midi_in_work
RIP: 0010:dummy_queue+0x1ae/0x900
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 db b3 7d fa 4d 8b 24 24 49 83 c4 60 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 f0 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc900017c7878 EFLAGS: 00010006
RAX: 000000000000000c RBX: ffff8881aab1f910 RCX: dffffc0000000000
RDX: ffff88816800da00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff8881aab1f900 R08: ffff8881a79a4d3b R09: 1ffff11034f349a7
R10: dffffc0000000000 R11: ffffffff87b73240 R12: 0000000000000060
R13: 1ffff11035563f20 R14: ffff8881697500e0 R15: ffff888169750c00
FS:  0000000000000000(0000) GS:ffff8882a8f49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31e22ff8 CR3: 00000001bd176000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 usb_ep_queue+0xf1/0x3c0
 f_midi_in_work+0x14a6/0x1a90
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1ae/0x900
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 db b3 7d fa 4d 8b 24 24 49 83 c4 60 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 f0 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc900017c7878 EFLAGS: 00010006
RAX: 000000000000000c RBX: ffff8881aab1f910 RCX: dffffc0000000000
RDX: ffff88816800da00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff8881aab1f900 R08: ffff8881a79a4d3b R09: 1ffff11034f349a7
R10: dffffc0000000000 R11: ffffffff87b73240 R12: 0000000000000060
R13: 1ffff11035563f20 R14: ffff8881697500e0 R15: ffff888169750c00
FS:  0000000000000000(0000) GS:ffff8882a8f49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31e22ff8 CR3: 00000001bd176000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
