dummy_hcd dummy_hcd.0: remove, state 4
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] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 399 Comm: syz.0.17 Not tainted syzkaller #0 9c722142e1cda5d0ace938c6e5c03d461fe7a5ab
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_udc_start+0xd1/0x1f0 drivers/usb/gadget/udc/dummy_hcd.c:1003
Code: 41 83 ff 03 74 18 41 83 ff 05 0f 85 94 00 00 00 e8 a4 0b ce fd eb 0c e8 9d 0b ce fd eb 05 e8 96 0b ce fd 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 80 cb 26 fe 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc90001a7f818 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888118864010 RCX: ffff8881160dcc00
RDX: 0000000000000000 RSI: ffffffff87a4b360 RDI: 0000000000000003
RBP: ffffc90001a7f840 R08: ffff8881160dcc00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  00007f52583ff6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5258587000 CR3: 000000011817e000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1225 [inline]
 gadget_bind_driver+0x3e1/0x9c0 drivers/usb/gadget/udc/core.c:1619
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2e1/0x8b0 drivers/base/dd.c:657
 __driver_probe_device+0x193/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __driver_attach+0x422/0x5e0 drivers/base/dd.c:1215
 bus_for_each_dev+0x249/0x2d0 drivers/base/bus.c:370
 driver_attach+0x46/0x50 drivers/base/dd.c:1233
 bus_add_driver+0x393/0x730 drivers/base/bus.c:675
 driver_register+0x2b7/0x3c0 drivers/base/driver.c:246
 usb_gadget_register_driver_owner+0xfc/0x270 drivers/usb/gadget/udc/core.c:1704
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
 raw_ioctl+0x144c/0x37a0 drivers/usb/gadget/legacy/raw_gadget.c:1307
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:893
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f525859db2b
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:00007f52583fcf00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f525859db2b
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007f52583fdfd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000200000001100 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_start+0xd1/0x1f0 drivers/usb/gadget/udc/dummy_hcd.c:1003
Code: 41 83 ff 03 74 18 41 83 ff 05 0f 85 94 00 00 00 e8 a4 0b ce fd eb 0c e8 9d 0b ce fd eb 05 e8 96 0b ce fd 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 80 cb 26 fe 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc90001a7f818 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888118864010 RCX: ffff8881160dcc00
RDX: 0000000000000000 RSI: ffffffff87a4b360 RDI: 0000000000000003
RBP: ffffc90001a7f840 R08: ffff8881160dcc00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  00007f52583ff6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe3c6f6030 CR3: 000000011817e000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	41 83 ff 03          	cmp    $0x3,%r15d
   4:	74 18                	je     0x1e
   6:	41 83 ff 05          	cmp    $0x5,%r15d
   a:	0f 85 94 00 00 00    	jne    0xa4
  10:	e8 a4 0b ce fd       	call   0xfdce0bb9
  15:	eb 0c                	jmp    0x23
  17:	e8 9d 0b ce fd       	call   0xfdce0bb9
  1c:	eb 05                	jmp    0x23
  1e:	e8 96 0b ce fd       	call   0xfdce0bb9
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 80 cb 26 fe       	call   0xfe26cbb9
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	e8                   	.byte 0xe8