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: 382 Comm: syz.2.17 Not tainted syzkaller #0 f10dc98c92500eb86b2a5bf5b389293121b4eb86
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_set_selfpowered+0xc0/0x160 drivers/usb/gadget/udc/dummy_hcd.c:887
Code: 94 c0 4d 8d b4 c6 d0 04 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 2a d5 26 fe 4d 8b 3e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 11 d5 26 fe 41 be 58 11 00 00 4d
RSP: 0018:ffffc90000f3f738 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8881156d5f00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000f3f758 R08: ffff888101652467 R09: 1ffff110202ca48c
R10: 0000000000000000 R11: ffffffff83b94f20 R12: dffffc0000000000
R13: ffff8881161734f0 R14: ffff888102711160 R15: 0000000000000000
FS:  0000555570a04500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000013106c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 usb_gadget_set_selfpowered+0x81/0x1a0 drivers/usb/gadget/udc/core.c:576
 composite_dev_prepare+0x2f8/0x3e0 drivers/usb/gadget/composite.c:2491
 configfs_composite_bind+0xa8/0x15f0 drivers/usb/gadget/configfs.c:1707
 gadget_bind_driver+0x304/0x9c0 drivers/usb/gadget/udc/core.c:1614
 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+0x246/0x2d0 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
 gadget_dev_desc_UDC_store+0x224/0x350 drivers/usb/gadget/configfs.c:305
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x32f/0x490 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 0033:0x7f566679de99
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:00007ffdeb505628 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5666a25fa0 RCX: 00007f566679de99
RDX: 000000000000000c RSI: 0000200000001000 RDI: 0000000000000004
RBP: 00007f5666833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5666a25fac R14: 00007f5666a25fa0 R15: 00007f5666a25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_set_selfpowered+0xc0/0x160 drivers/usb/gadget/udc/dummy_hcd.c:887
Code: 94 c0 4d 8d b4 c6 d0 04 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 2a d5 26 fe 4d 8b 3e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 11 d5 26 fe 41 be 58 11 00 00 4d
RSP: 0018:ffffc90000f3f738 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8881156d5f00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000f3f758 R08: ffff888101652467 R09: 1ffff110202ca48c
R10: 0000000000000000 R11: ffffffff83b94f20 R12: dffffc0000000000
R13: ffff8881161734f0 R14: ffff888102711160 R15: 0000000000000000
FS:  0000555570a04500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000013106c000 CR4: 00000000003526b0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	4d 8d b4 c6 d0 04 00 	lea    0x4d0(%r14,%rax,8),%r14
   7:	00
   8:	4c 89 f0             	mov    %r14,%rax
   b:	48 c1 e8 03          	shr    $0x3,%rax
   f:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  14:	74 08                	je     0x1e
  16:	4c 89 f7             	mov    %r14,%rdi
  19:	e8 2a d5 26 fe       	call   0xfe26d548
  1e:	4d 8b 3e             	mov    (%r14),%r15
  21:	4c 89 f8             	mov    %r15,%rax
  24:	48 c1 e8 03          	shr    $0x3,%rax
* 28:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	4c 89 ff             	mov    %r15,%rdi
  32:	e8 11 d5 26 fe       	call   0xfe26d548
  37:	41 be 58 11 00 00    	mov    $0x1158,%r14d
  3d:	4d                   	rex.WRB