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: 134 Comm: dhcpcd Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:712 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 52 42 92 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:ffffc9000094ec40 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff8881251c6c10 RCX: dffffc0000000000 RDX: ffff88811a2b4f00 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc9000094ecb8 R08: ffff8881194528a3 R09: 1ffff1102328a514 R10: dffffc0000000000 R11: ffffed102328a515 R12: 0000000000000048 R13: ffff8881251c6c00 R14: 1ffff11024a38d80 R15: ffff8881041f4c90 FS: 00007ff8c409a740(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556c6665fda8 CR3: 000000011a273000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_ep_queue+0xce/0x210 drivers/usb/gadget/udc/core.c:290 eth_start_xmit+0x811/0xd40 drivers/usb/gadget/function/u_ether.c:588 __netdev_start_xmit include/linux/netdevice.h:4864 [inline] netdev_start_xmit include/linux/netdevice.h:4878 [inline] xmit_one net/core/dev.c:3606 [inline] dev_hard_start_xmit+0x245/0x680 net/core/dev.c:3622 sch_direct_xmit+0x26d/0x990 net/sched/sch_generic.c:339 qdisc_restart net/sched/sch_generic.c:404 [inline] __qdisc_run+0xa3a/0x1400 net/sched/sch_generic.c:412 qdisc_run+0x100/0x2f0 include/net/pkt_sched.h:126 __dev_xmit_skb net/core/dev.c:3817 [inline] __dev_queue_xmit+0xbc6/0x2500 net/core/dev.c:4173 dev_queue_xmit+0x17/0x20 net/core/dev.c:4254 neigh_hh_output include/net/neighbour.h:501 [inline] neigh_output include/net/neighbour.h:515 [inline] ip6_finish_output2+0xea9/0x1540 net/ipv6/ip6_output.c:130 __ip6_finish_output+0x5fd/0x790 net/ipv6/ip6_output.c:201 ip6_finish_output+0x33/0x1e0 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:288 [inline] ip6_output+0x1fa/0x420 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:451 [inline] ip6_local_out+0x200/0x3c0 net/ipv6/output_core.c:161 ip6_send_skb net/ipv6/ip6_output.c:1874 [inline] ip6_push_pending_frames+0x142/0x280 net/ipv6/ip6_output.c:1895 rawv6_push_pending_frames+0x631/0x7d0 net/ipv6/raw.c:617 rawv6_sendmsg+0x11bb/0x16c0 net/ipv6/raw.c:961 inet_sendmsg+0xa5/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431 __sys_sendmsg net/socket.c:2460 [inline] __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7ff8c4124407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd70e91b50 EFLAGS: 00000202 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff8c409a740 RCX: 00007ff8c4124407 RDX: 0000000000000000 RSI: 00007ffd70ea1d00 RDI: 000000000000000d RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd70eb1f30 R13: 0000000000000002 R14: 0000000000000010 R15: 00007ffd70ea1d00 Modules linked in: ---[ end trace fb123983b2eed2cb ]--- RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:712 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 52 42 92 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:ffffc9000094ec40 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff8881251c6c10 RCX: dffffc0000000000 RDX: ffff88811a2b4f00 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc9000094ecb8 R08: ffff8881194528a3 R09: 1ffff1102328a514 R10: dffffc0000000000 R11: ffffed102328a515 R12: 0000000000000048 R13: ffff8881251c6c00 R14: 1ffff11024a38d80 R15: ffff8881041f4c90 FS: 00007ff8c409a740(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556c6665fda8 CR3: 000000011a273000 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 52 42 92 fe call 0xfe924263 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