Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 1 UID: 0 PID: 5262 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:dummy_queue+0x1a9/0x920 drivers/usb/gadget/udc/dummy_hcd.c:737 Code: e8 03 42 80 3c 20 00 74 08 48 89 ef e8 b0 f3 00 fb 48 8b 6d 00 48 83 c5 60 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 ec 05 00 00 8b 6d 00 89 ee 83 e6 02 31 ff RSP: 0018:ffffc90003f2f178 EFLAGS: 00010206 RAX: 000000000000000c RBX: ffff888031dee610 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 0000000000000060 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffffff872e4820 R12: dffffc0000000000 R13: ffff888031dee600 R14: 1ffff110063bdcc0 R15: ffff888020fd8c40 FS: 00007f1bc5d64780(0000) GS:ffff888125d41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f77b0515ff8 CR3: 000000003dc6c000 CR4: 00000000003526f0 Call Trace: usb_ep_queue+0xf1/0x3c0 drivers/usb/gadget/udc/core.c:305 eth_start_xmit+0x984/0x1060 drivers/usb/gadget/function/u_ether.c:579 __netdev_start_xmit include/linux/netdevice.h:5400 [inline] netdev_start_xmit include/linux/netdevice.h:5409 [inline] xmit_one net/core/dev.c:3889 [inline] dev_hard_start_xmit+0x2df/0x870 net/core/dev.c:3905 sch_direct_xmit+0x257/0x4c0 net/sched/sch_generic.c:372 __dev_xmit_skb net/core/dev.c:4214 [inline] __dev_queue_xmit+0x16ce/0x3880 net/core/dev.c:4836 lapb_data_transmit+0x90/0xb0 net/lapb/lapb_iface.c:447 lapb_transmit_buffer+0x163/0x200 net/lapb/lapb_out.c:149 lapb_establish_data_link+0x89/0xe0 net/lapb/lapb_out.c:-1 lapb_device_event+0x413/0x5a0 net/lapb/lapb_iface.c:-1 notifier[ 133.363435][ T5262] notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2288 [inline] call_netdevice_notifiers net/core/dev.c:2302 [inline] __dev_notify_flags+0x1aa/0x310 net/core/dev.c:9799 netif_change_flags+0xde/0x1b0 net/core/dev.c:9828 dev_change_flags+0x128/0x260 net/core/dev_api.c:68 devinet_ioctl+0x966/0x1c50 net/ipv4/devinet.c:1199 inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1009 sock_do_ioctl+0x101/0x320 net/socket.c:1300 sock_ioctl+0x57d/0x7f0 net/socket.c:1421 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1bc5e64378 Code: 00 00 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 07 89 d0 c3 0f 1f 40 00 48 8b 15 49 3a 0d RSP: 002b:00007ffcb1cdfec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000012 RCX: 00007f1bc5e64378 RDX: 00007ffcb1cf00c0 RSI: 0000000000008914 RDI: 0000000000000012 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcb1d00260 R13: 00007f1bc5d64708 R14: 0000000000000028 R15: 0000000000008914 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dummy_queue+0x1a9/0x920 drivers/usb/gadget/udc/dummy_hcd.c:737 Code: e8 03 42 80 3c 20 00 74 08 48 89 ef e8 b0 f3 00 fb 48 8b 6d 00 48 83 c5 60 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 ec 05 00 00 8b 6d 00 89 ee 83 e6 02 31 ff RSP: 0018:ffffc90003f2f178 EFLAGS: 00010206 RAX: 000000000000000c RBX: ffff888031dee610 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 0000000000000060 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffffff872e4820 R12: dffffc0000000000 R13: ffff888031dee600 R14: 1ffff110063bdcc0 R15: ffff888020fd8c40 FS: 00007f1bc5d64780(0000) GS:ffff888125d41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f77b0515ff8 CR3: 000000003dc6c000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: e8 03 42 80 3c call 0x3c804208 5: 20 00 and %al,(%rax) 7: 74 08 je 0x11 9: 48 89 ef mov %rbp,%rdi c: e8 b0 f3 00 fb call 0xfb00f3c1 11: 48 8b 6d 00 mov 0x0(%rbp),%rbp 15: 48 83 c5 60 add $0x60,%rbp 19: 48 89 e8 mov %rbp,%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 ec 05 00 00 jne 0x622 36: 8b 6d 00 mov 0x0(%rbp),%ebp 39: 89 ee mov %ebp,%esi 3b: 83 e6 02 and $0x2,%esi 3e: 31 ff xor %edi,%edi