Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 UID: 0 PID: 5799 Comm: kworker/0:3 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1200
Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 4e 95 ce fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 6b f9 32 fb 4d 8b 1e 48 89 df 2e e8
RSP: 0018:ffffc90004eaf288 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888144318c40 RCX: dffffc0000000000
RDX: ffffc9001a974000 RSI: 00000000000002f2 RDI: 00000000000002f3
RBP: ffff888040f5d46c R08: ffffffff8f47de77 R09: 1ffffffff1e8fbce
R10: dffffc0000000000 R11: fffffbfff1e8fbcf R12: ffff888144318c40
R13: 1ffff110050944a1 R14: 0000000000000040 R15: 1ffff11028863187
FS: 0000000000000000(0000) GS:ffff8881265c9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4da064ff8 CR3: 0000000030ff4000 CR4: 00000000003526f0
Call Trace:
<TASK>
set_link_state+0x80b/0x1220 drivers/usb/gadget/udc/dummy_hcd.c:469
dummy_hub_control+0xa09/0x1a00 drivers/usb/gadget/udc/dummy_hcd.c:-1
rh_call_control drivers/usb/core/hcd.c:656 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:821 [inline]
usb_hcd_submit_urb+0xdbe/0x1b50 drivers/usb/core/hcd.c:1542
usb_start_wait_urb+0x12b/0x510 drivers/usb/core/message.c:59
usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154
set_port_feature drivers/usb/core/hub.c:466 [inline]
hub_port_reset+0x3c7/0x1820 drivers/usb/core/hub.c:3083
hub_port_init+0x299/0x28c0 drivers/usb/core/hub.c:4939
hub_port_connect drivers/usb/core/hub.c:5496 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x25d3/0x4f60 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1200
Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 4e 95 ce fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 6b f9 32 fb 4d 8b 1e 48 89 df 2e e8
RSP: 0018:ffffc90004eaf288 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888144318c40 RCX: dffffc0000000000
RDX: ffffc9001a974000 RSI: 00000000000002f2 RDI: 00000000000002f3
RBP: ffff888040f5d46c R08: ffffffff8f47de77 R09: 1ffffffff1e8fbce
R10: dffffc0000000000 R11: fffffbfff1e8fbcf R12: ffff888144318c40
R13: 1ffff110050944a1 R14: 0000000000000040 R15: 1ffff11028863187
FS: 0000000000000000(0000) GS:ffff8881265c9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4da064ff8 CR3: 0000000030ff4000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: f3 0f 1e fa endbr64
7: 41 56 push %r14
9: 53 push %rbx
a: 49 89 f6 mov %rsi,%r14
d: 48 89 fb mov %rdi,%rbx
10: e8 4e 95 ce fa call 0xface9563
15: 49 83 c6 40 add $0x40,%r14
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 f7 mov %r14,%rdi
33: e8 6b f9 32 fb call 0xfb32f9a3
38: 4d 8b 1e mov (%r14),%r11
3b: 48 89 df mov %rbx,%rdi
3e: 2e cs
3f: e8 .byte 0xe8