general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 4484 Comm: syz.0.21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:dummy_udc_stop+0x77/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1034
Code: 94 c0 48 8d 9c c3 38 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 03 ae 53 fb 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 ea ad 53 fb 48 8b 1b 48 89 df e8
RSP: 0018:ffffc90004cbfad0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff88802a7b9e00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 0000000000000003 R08: ffffffff8e210aef R09: 1ffffffff1c4215d
R10: dffffc0000000000 R11: fffffbfff1c4215e R12: 1ffff110050ea093
R13: ffffffff8b3eeeb8 R14: dffffc0000000000 R15: ffff888027fb8c00
FS:  00007fd120fa56c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fc10ff8 CR3: 0000000025ada000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1255 [inline]
 gadget_unbind_driver+0x249/0x3d0 drivers/usb/gadget/udc/core.c:1705
 device_remove drivers/base/dd.c:547 [inline]
 __device_release_driver drivers/base/dd.c:1279 [inline]
 device_release_driver_internal+0x47d/0x7c0 drivers/base/dd.c:1305
 driver_detach+0x1ef/0x2d0 drivers/base/dd.c:1368
 bus_remove_driver+0x11c/0x230 drivers/base/bus.c:679
 usb_gadget_unregister_driver+0x4a/0x70 drivers/usb/gadget/udc/core.c:1762
 unregister_gadget drivers/usb/gadget/configfs.c:253 [inline]
 gadget_dev_desc_UDC_store+0x174/0x2e0 drivers/usb/gadget/configfs.c:280
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd12019e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd120fa5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd120426180 RCX: 00007fd12019e0d9
RDX: 0000000000000001 RSI: 0000200000000800 RDI: 0000000000000004
RBP: 00007fd120235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd120426218 R14: 00007fd120426180 R15: 00007ffd8ed8dc58
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RBP: 0000000000000003 R08: ffffffff8e210aef R09: 1ffffffff1c4215d
R10: dffffc0000000000 R11: fffffbfff1c4215e R12: 1ffff110050ea093
R13: ffffffff8b3eeeb8 R14: dffffc0000000000 R15: ffff888027fb8c00
FS:  00007fd120fa56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c45e846 CR3: 0000000025ada000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	94                   	xchg   %eax,%esp
   1:	c0 48 8d 9c          	rorb   $0x9c,-0x73(%rax)
   5:	c3                   	ret
   6:	38 06                	cmp    %al,(%rsi)
   8:	00 00                	add    %al,(%rax)
   a:	48 89 d8             	mov    %rbx,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1)
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 03 ae 53 fb       	call   0xfb53ae23
  20:	48 8b 1b             	mov    (%rbx),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 ea ad 53 fb       	call   0xfb53ae23
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	e8                   	.byte 0xe8