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: 150 Comm: dhcpcd Not tainted syzkaller #0 0b31bef96cff8e44f9e14c4f768eb06c85e3b290 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 79 a1 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:ffffc90000e0ec28 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffff8881143bc010 RCX: dffffc0000000000 RDX: ffff88811e9a0000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000e0eca0 R08: 0000000000000003 R09: 0000000000000004 R10: 0000000000000000 R11: ffffffff83b99190 R12: 0000000000000050 R13: ffff8881143bc000 R14: 1ffff11022877800 R15: ffff88810ce88c90 FS: 00007fc1a373d740(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb18400d8 CR3: 000000011e8ee000 CR4: 00000000003526b0 Call Trace: usb_ep_queue+0xe3/0x230 drivers/usb/gadget/udc/core.c:303 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+0x233/0x730 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] ip6_local_out+0x213/0x440 net/ipv6/output_core.c:155 ip6_send_skb net/ipv6/ip6_output.c:1979 [inline] ip6_push_pending_frames+0x181/0x2e0 net/ipv6/ip6_output.c:2000 rawv6_push_pending_frames+0x74d/0x940 net/ipv6/raw.c:588 rawv6_sendmsg+0x12f2/0x1820 net/ipv6/raw.c:920 inet_sendmsg+0x113/0x120 net/ipv4/af_inet.c:858 sock_sendmsg_nosec net/socket.c:731 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x822/0xa00 net/socket.c:2609 ___sys_sendmsg+0x2a6/0x370 net/socket.c:2663 __sys_sendmsg net/socket.c:2692 [inline] __do_sys_sendmsg net/socket.c:2701 [inline] __se_sys_sendmsg net/socket.c:2699 [inline] __x64_sys_sendmsg+0x206/0x2e0 net/socket.c:2699 x64_sys_call+0x2a4c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7fc1a37c7407 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:00007ffc68c6c6e0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc1a373d740 RCX: 00007fc1a37c7407 RDX: 0000000000000000 RSI: 00007ffc68c7c890 RDI: 000000000000000d RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc68c8cac0 R13: 0000000000000002 R14: 0000000000000010 R15: 00007ffc68c7c890 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 79 a1 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:ffffc90000e0ec28 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffff8881143bc010 RCX: dffffc0000000000 RDX: ffff88811e9a0000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000e0eca0 R08: 0000000000000003 R09: 0000000000000004 R10: 0000000000000000 R11: ffffffff83b99190 R12: 0000000000000050 R13: ffff8881143bc000 R14: 1ffff11022877800 R15: ffff88810ce88c90 FS: 00007fc1a373d740(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb18400d8 CR3: 000000011e8ee000 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 79 a1 26 fe call 0xfe26a18a 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