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: 6441 Comm: syz.4.2141 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:set_link_state+0x2a/0x1230 drivers/usb/gadget/udc/dummy_hcd.c:435
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 60 49 89 fd 48 bb 00 00 00 00 00 fc ff df e8 4d fb 24 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 e8 85 6a fe 4d 8b 75 00 49 8d 95 9b
RSP: 0018:ffffc900030276e8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000efe1000 RSI: 0000000000000d32 RDI: 0000000000000d33
RBP: ffffc90003027770 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000604edc R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810da30000
FS:  00007fb5ff88f6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f120ff8 CR3: 0000000131327000 CR4: 00000000003506b0
Call Trace:
 <TASK>
 dummy_pullup+0xcd/0x130 drivers/usb/gadget/udc/dummy_hcd.c:914
 usb_gadget_disconnect_locked+0x14c/0x3f0 drivers/usb/gadget/udc/core.c:758
 gadget_unbind_driver+0xab/0x3d0 drivers/usb/gadget/udc/core.c:1679
 device_remove drivers/base/dd.c:548 [inline]
 __device_release_driver drivers/base/dd.c:1283 [inline]
 device_release_driver_internal+0x486/0x7e0 drivers/base/dd.c:1309
 device_release_driver+0x19/0x20 drivers/base/dd.c:1332
 bus_remove_device+0x2f0/0x350 drivers/base/bus.c:531
 device_del+0x63c/0xe50 drivers/base/core.c:3886
 usb_del_gadget+0x1b7/0x270 drivers/usb/gadget/udc/core.c:1552
 usb_del_gadget_udc+0x15/0x30 drivers/usb/gadget/udc/core.c:1575
 dummy_udc_remove+0x58/0x60 drivers/usb/gadget/udc/dummy_hcd.c:1123
 platform_remove+0xb8/0x110 drivers/base/platform.c:1422
 device_remove drivers/base/dd.c:548 [inline]
 __device_release_driver drivers/base/dd.c:1283 [inline]
 device_release_driver_internal+0x486/0x7e0 drivers/base/dd.c:1309
 device_driver_detach+0x3b/0x40 drivers/base/dd.c:1345
 unbind_store+0x2e5/0x300 drivers/base/bus.c:193
 drv_attr_store+0x88/0xb0 drivers/base/bus.c:77
 sysfs_kf_write+0x137/0x150 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x307/0x470 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2282 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x5ef/0xd00 fs/read_write.c:584
 ksys_write+0x14a/0x260 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 0033:0x7fb5fe99df99
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:00007fb5ff88f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb5fec25fa0 RCX: 00007fb5fe99df99
RDX: 000000000000000b RSI: 0000200000000400 RDI: 0000000000000003
RBP: 00007fb5fea34ec4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb5fec26038 R14: 00007fb5fec25fa0 R15: 00007ffe72cf0978
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_link_state+0x2a/0x1230 drivers/usb/gadget/udc/dummy_hcd.c:435
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 60 49 89 fd 48 bb 00 00 00 00 00 fc ff df e8 4d fb 24 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 e8 85 6a fe 4d 8b 75 00 49 8d 95 9b
RSP: 0018:ffffc900030276e8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000efe1000 RSI: 0000000000000d32 RDI: 0000000000000d33
RBP: ffffc90003027770 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000604edc R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810da30000
FS:  00007fb5ff88f6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f120ff8 CR3: 0000000131327000 CR4: 00000000003506b0
----------------
Code disassembly (best guess):
   0:	55                   	push   %rbp
   1:	48 89 e5             	mov    %rsp,%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 60          	sub    $0x60,%rsp
  11:	49 89 fd             	mov    %rdi,%r13
  14:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
  1b:	fc ff df
  1e:	e8 4d fb 24 fe       	call   0xfe24fb70
  23:	4c 89 e8             	mov    %r13,%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 ef             	mov    %r13,%rdi
  33:	e8 e8 85 6a fe       	call   0xfe6a8620
  38:	4d 8b 75 00          	mov    0x0(%r13),%r14
  3c:	49                   	rex.WB
  3d:	8d                   	.byte 0x8d
  3e:	95                   	xchg   %eax,%ebp
  3f:	9b                   	fwait