Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 1 UID: 0 PID: 67 Comm: kworker/1:2 Not tainted syzkaller #0 1c659cfea3877f078df945e50c8eb7045fd035a9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: mld mld_dad_work
RIP: 0010:dummy_queue+0x1c0/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 49 a0 26 fe 4d 8b 24 24 49 83 c4 50 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 f5 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000d7f0e8 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff88810f7da210 RCX: dffffc0000000000
RDX: ffff888101be5f00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000d7f160 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: ffffffff83b99350 R12: 0000000000000050
R13: ffff88810f7da200 R14: 1ffff11021efb440 R15: ffff88810235cc90
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a0ca07286 CR3: 000000013648e000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 usb_ep_queue+0xe3/0x230 drivers/usb/gadget/udc/core.c:305
 eth_start_xmit+0x9c1/0xf90 drivers/usb/gadget/function/u_ether.c:578
 __netdev_start_xmit include/linux/netdevice.h:5008 [inline]
 netdev_start_xmit include/linux/netdevice.h:5017 [inline]
 xmit_one net/core/dev.c:3693 [inline]
 dev_hard_start_xmit+0x230/0x730 net/core/dev.c:3709
 sch_direct_xmit+0x27d/0x9c0 net/sched/sch_generic.c:346
 __dev_xmit_skb net/core/dev.c:3935 [inline]
 __dev_queue_xmit+0x1611/0x3780 net/core/dev.c:4511
 dev_queue_xmit include/linux/netdevice.h:3141 [inline]
 neigh_hh_output include/net/neighbour.h:535 [inline]
 neigh_output include/net/neighbour.h:549 [inline]
 ip6_finish_output2+0x16b2/0x1990 net/ipv6/ip6_output.c:141
 __ip6_finish_output net/ipv6/ip6_output.c:215 [inline]
 ip6_finish_output+0x535/0xaf0 net/ipv6/ip6_output.c:226
 NF_HOOK_COND include/linux/netfilter.h:306 [inline]
 ip6_output+0x1fe/0x420 net/ipv6/ip6_output.c:247
 dst_output include/net/dst.h:460 [inline]
 NF_HOOK include/linux/netfilter.h:317 [inline]
 mld_sendpack+0x751/0xd10 net/ipv6/mcast.c:1824
 mld_send_initial_cr+0x1c0/0x320 net/ipv6/mcast.c:2241
 mld_dad_work+0x3e/0x4e0 net/ipv6/mcast.c:2264
 process_one_work kernel/workqueue.c:3273 [inline]
 process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1c0/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 49 a0 26 fe 4d 8b 24 24 49 83 c4 50 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 f5 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000d7f0e8 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff88810f7da210 RCX: dffffc0000000000
RDX: ffff888101be5f00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000d7f160 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: ffffffff83b99350 R12: 0000000000000050
R13: ffff88810f7da200 R14: 1ffff11021efb440 R15: ffff88810235cc90
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a0ca07286 CR3: 000000013648e000 CR4: 00000000003526b0
----------------
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 49 a0 26 fe       	call   0xfe26a05a
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 50          	add    $0x50,%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 f5 05 00 00    	jne    0x62b
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi