general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 293 Comm: kworker/0:2 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:714
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 12 56 7f fe 4d 8b 24 24 49 83 c4 48 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 80 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000ad6f60 EFLAGS: 00010206
RAX: 0000000000000009 RBX: ffff8881073d4210 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000ad6fd8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200015adf0 R12: 0000000000000048
R13: ffff8881073d4200 R14: 1ffff11020e7a840 R15: ffff88810b7c4c90
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc04b1b93ec CR3: 00000001458dd000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_ep_queue+0xce/0x210 drivers/usb/gadget/udc/core.c:288
 eth_start_xmit+0x811/0xd40 drivers/usb/gadget/function/u_ether.c:589
 __netdev_start_xmit include/linux/netdevice.h:5064 [inline]
 netdev_start_xmit include/linux/netdevice.h:5078 [inline]
 xmit_one net/core/dev.c:3670 [inline]
 dev_hard_start_xmit+0x245/0x680 net/core/dev.c:3686
 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345
 __dev_xmit_skb net/core/dev.c:3905 [inline]
 __dev_queue_xmit+0x14f1/0x2d60 net/core/dev.c:4274
 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355
 neigh_resolve_output+0x6c4/0x770 net/core/neighbour.c:1504
 neigh_output include/net/neighbour.h:517 [inline]
 ip6_finish_output2+0x10d0/0x1790 net/ipv6/ip6_output.c:130
 __ip6_finish_output+0x621/0x7e0 net/ipv6/ip6_output.c:201
 ip6_finish_output+0x31/0x220 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x1fa/0x410 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0x7f6/0xcf0 net/ipv6/ndisc.c:513
 ndisc_send_ns+0x879/0xb10 net/ipv6/ndisc.c:655
 addrconf_dad_work+0x9fa/0x1510 net/ipv6/addrconf.c:4225
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace 19e07a2f4b1a46f5 ]---
RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:714
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 12 56 7f fe 4d 8b 24 24 49 83 c4 48 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 80 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000ad6f60 EFLAGS: 00010206
RAX: 0000000000000009 RBX: ffff8881073d4210 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000ad6fd8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200015adf0 R12: 0000000000000048
R13: ffff8881073d4200 R14: 1ffff11020e7a840 R15: ffff88810b7c4c90
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc04b1b93ec CR3: 00000001458dd000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   8:	08 4c 89 e7          	or     %cl,-0x19(%rcx,%rcx,4)
   c:	e8 12 56 7f fe       	call   0xfe7f5623
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 48          	add    $0x48,%r12
  19:	4c 89 e0             	mov    %r12,%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:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 80 05 00 00    	jne    0x5b6
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi