general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 0 PID: 55 Comm: kworker/0:1H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_highpri f_midi_in_work
RIP: 0010:dummy_queue+0x1a6/0x910 drivers/usb/gadget/udc/dummy_hcd.c:736
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 33 89 23 fb 4d 8b 24 24 49 83 c4 50 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 09 06 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90001397940 EFLAGS: 00010006
RAX: 000000000000000a RBX: ffff88805cbb3b10 RCX: dffffc0000000000
RDX: ffff888018e88000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff88805cbb3b00 R08: ffff888060067333 R09: 1ffff1100c00ce66
R10: dffffc0000000000 R11: ffffed100c00ce67 R12: 0000000000000050
R13: 1ffff1100b976760 R14: ffff888142b20590 R15: ffff888142b20c00
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c048f9e9c CR3: 000000003022d000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 usb_ep_queue+0xea/0x350 drivers/usb/gadget/udc/core.c:305
 f_midi_do_transmit drivers/usb/gadget/function/f_midi.c:658 [inline]
 f_midi_transmit drivers/usb/gadget/function/f_midi.c:686 [inline]
 f_midi_in_work+0x14a7/0x1a90 drivers/usb/gadget/function/f_midi.c:706
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1a6/0x910 drivers/usb/gadget/udc/dummy_hcd.c:736
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 33 89 23 fb 4d 8b 24 24 49 83 c4 50 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 09 06 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90001397940 EFLAGS: 00010006
RAX: 000000000000000a RBX: ffff88805cbb3b10 RCX: dffffc0000000000
RDX: ffff888018e88000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff88805cbb3b00 R08: ffff888060067333 R09: 1ffff1100c00ce66
R10: dffffc0000000000 R11: ffffed100c00ce67 R12: 0000000000000050
R13: 1ffff1100b976760 R14: ffff888142b20590 R15: ffff888142b20c00
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c048f9e9c CR3: 000000003022d000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   8:	08 4c 89 e7          	or     %cl,-0x19(%rcx,%rcx,4)
   c:	e8 33 89 23 fb       	call   0xfb238944
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 50          	add    $0x50,%r12
  19:	4c 89 e0             	mov    %r12,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 09 06 00 00    	jne    0x63f
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi