usb 1-1: USB disconnect, device number 2
dummy_hcd dummy_hcd.0: stopped
dummy_hcd dummy_hcd.0: USB bus 1 deregistered
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5931 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:set_link_state+0x27/0x1000 drivers/usb/gadget/udc/dummy_hcd.c:454
Code: 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 38 49 89 fe 48 bb 00 00 00 00 00 fc ff df e8 e0 4b cb fa 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 bb c4 23 fb 49 8b 0e 4d 8d a6 93 00
RSP: 0018:ffffc90003307718 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88801b7cbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000660ecc R12: 0000000000000a02
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc78750a2f2 CR3: 000000000cf32000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 dummy_pullup+0xc1/0x120 drivers/usb/gadget/udc/dummy_hcd.c:932
 usb_gadget_disconnect_locked+0x120/0x440 drivers/usb/gadget/udc/core.c:782
 gadget_unbind_driver+0xc2/0x3e0 drivers/usb/gadget/udc/core.c:1696
 device_remove drivers/base/dd.c:626 [inline]
 __device_release_driver drivers/base/dd.c:1351 [inline]
 device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374
 driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1437
 bus_remove_driver+0x221/0x2f0 drivers/base/bus.c:792
 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1762
 raw_release+0xda/0x260 drivers/usb/gadget/legacy/raw_gadget.c:416
 __fput+0x221/0x940 fs/file_table.c:418
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x986/0x2530 kernel/exit.c:890
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1032
 get_signal+0x12a6/0x1390 kernel/signal.c:2911
 arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5e8d59e0d9
Code: Unable to access opcode bytes at 0x7f5e8d59e0af.
RSP: 002b:00007fff34693988 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 000000000000000b RBX: 00007f5e8d825fa0 RCX: 00007f5e8d59e0d9
RDX: 000000000000000b RSI: 0000200000000200 RDI: 0000000000000004
RBP: 00007f5e8d635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e8d825fac R14: 00007f5e8d825fa0 R15: 00007f5e8d825fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_link_state+0x27/0x1000 drivers/usb/gadget/udc/dummy_hcd.c:454
Code: 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 38 49 89 fe 48 bb 00 00 00 00 00 fc ff df e8 e0 4b cb fa 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 bb c4 23 fb 49 8b 0e 4d 8d a6 93 00
RSP: 0018:ffffc90003307718 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88801b7cbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000660ecc R12: 0000000000000a02
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc78750a2f2 CR3: 000000000cf32000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	0f 1f 00             	nopl   (%rax)
   3:	55                   	push   %rbp
   4:	41 57                	push   %r15
   6:	41 56                	push   %r14
   8:	41 55                	push   %r13
   a:	41 54                	push   %r12
   c:	53                   	push   %rbx
   d:	48 83 ec 38          	sub    $0x38,%rsp
  11:	49 89 fe             	mov    %rdi,%r14
  14:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
  1b:	fc ff df
  1e:	e8 e0 4b cb fa       	call   0xfacb4c03
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 bb c4 23 fb       	call   0xfb23c4f3
  38:	49 8b 0e             	mov    (%r14),%rcx
  3b:	4d                   	rex.WRB
  3c:	8d                   	.byte 0x8d
  3d:	a6                   	cmpsb  %es:(%rdi),%ds:(%rsi)
  3e:	93                   	xchg   %eax,%ebx