general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] CPU: 1 PID: 658 Comm: dhcpcd Not tainted 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:714 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 b2 5c 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:ffffc90000b87120 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff8881255e5f10 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000b87198 R08: ffff88811ceb42a3 R09: 1ffff110239d6854 R10: dffffc0000000000 R11: ffffed10239d6855 R12: 0000000000000048 R13: ffff8881255e5f00 R14: 1ffff11024abcbe0 R15: ffff8881045d0c90 FS: 00007f02bd8af740(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000044000 CR3: 000000010fc88000 CR4: 00000000003506a0 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: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 packet_snd net/packet/af_packet.c:3094 [inline] packet_sendmsg+0x3c54/0x5060 net/packet/af_packet.c:3125 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1080 do_iter_readv_writev+0x477/0x5f0 fs/read_write.c:-1 do_iter_write+0x207/0x7b0 fs/read_write.c:855 vfs_writev+0x2df/0x570 fs/read_write.c:928 do_writev+0x14e/0x2c0 fs/read_write.c:971 __do_sys_writev fs/read_write.c:1044 [inline] __se_sys_writev fs/read_write.c:1041 [inline] __x64_sys_writev+0x7d/0x90 fs/read_write.c:1041 x64_sys_call+0x974/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:21 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f02bd939407 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:00007ffce3b56ed0 EFLAGS: 00000202 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f02bd8af740 RCX: 00007f02bd939407 RDX: 0000000000000002 RSI: 00007ffce3b56f30 RDI: 0000000000000003 RBP: 0000000000000188 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffce3b56f70 R13: 000055a5dc8d23f0 R14: 00007ffce3b56fc0 R15: 00007ffce3b67190 Modules linked in: ---[ end trace 97ebdcc0f9059613 ]--- 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 b2 5c 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:ffffc90000b87120 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff8881255e5f10 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000b87198 R08: ffff88811ceb42a3 R09: 1ffff110239d6854 R10: dffffc0000000000 R11: ffffed10239d6855 R12: 0000000000000048 R13: ffff8881255e5f00 R14: 1ffff11024abcbe0 R15: ffff8881045d0c90 FS: 00007f02bd8af740(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000044000 CR3: 000000010fc88000 CR4: 00000000003506a0 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 b2 5c 7f fe call 0xfe7f5cc3 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