usb usb1: USB disconnect, device number 1
dummy_hcd dummy_hcd.0: stopped
dummy_hcd dummy_hcd.0: USB bus 1 deregistered
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5608 Comm: syz-executor214 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_udc_start+0x91/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1022
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 28 01 00 00 4c 8b ab 90 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 10 01 00 00 83 ed 01 bf 02 00 00 00 49 8b 5d 00
RSP: 0018:ffffc900035afb48 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888027058c00 RCX: ffffffff87cf0c09
RDX: 0000000000000000 RSI: ffffffff87cf0c17 RDI: ffff888027059290
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88807b6bc050
R13: 0000000000000000 R14: ffff888026b8d4f1 R15: ffff888026b8d008
FS:  0000555561b9a400(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000062b5d8 CR3: 000000007376f000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1237 [inline]
 gadget_bind_driver+0x4ac/0xbf0 drivers/usb/gadget/udc/core.c:1667
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292
 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763
 driver_register+0x1e2/0x360 drivers/base/driver.c:174
 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
 raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2706db0ddb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fff3fa6c530 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f2706db0ddb
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007fff3fa6d600 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2706e4ab20 R14: 00007fff3fa6c5d0 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_start+0x91/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1022
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 28 01 00 00 4c 8b ab 90 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 10 01 00 00 83 ed 01 bf 02 00 00 00 49 8b 5d 00
RSP: 0018:ffffc900035afb48 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888027058c00 RCX: ffffffff87cf0c09
RDX: 0000000000000000 RSI: ffffffff87cf0c17 RDI: ffff888027059290
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88807b6bc050
R13: 0000000000000000 R14: ffff888026b8d4f1 R15: ffff888026b8d008
FS:  0000555561b9a400(0000) GS:ffff888123dec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005579a75e4b60 CR3: 000000007376f000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	0f 85 28 01 00 00    	jne    0x13a
  12:	4c 8b ab 90 06 00 00 	mov    0x690(%rbx),%r13
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 ea             	mov    %r13,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 10 01 00 00    	jne    0x144
  34:	83 ed 01             	sub    $0x1,%ebp
  37:	bf 02 00 00 00       	mov    $0x2,%edi
  3c:	49 8b 5d 00          	mov    0x0(%r13),%rbx