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: 101 PID: 3389 Comm: dhcpcd Not tainted syzkaller #0 45964a5c932d45c81e53484b258bbb49855afb35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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 89 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:ffffc9000322f028 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffff88810b35a510 RCX: dffffc0000000000 RDX: ffff888136cddf00 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc9000322f0a0 R08: 0000000000000003 R09: 0000000000000004 R10: 0000000000000000 R11: ffffffff83b98e90 R12: 0000000000000050 R13: ffff88810b35a500 R14: 1ffff1102166b4a0 R15: ffff888102750c90 FS: 00007f7a6a858740(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdd5cd0f00 CR3: 00000001341c4000 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+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] packet_xmit+0x76/0x360 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3135 [inline] packet_sendmsg+0x435e/0x56b0 net/packet/af_packet.c:3167 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_write_iter+0x442/0x490 net/socket.c:1166 do_iter_readv_writev+0x629/0x820 fs/read_write.c:-1 vfs_writev+0x4a5/0xe90 fs/read_write.c:1076 do_writev+0x151/0x2e0 fs/read_write.c:1123 __do_sys_writev fs/read_write.c:1196 [inline] __se_sys_writev fs/read_write.c:1193 [inline] __x64_sys_writev+0x81/0x90 fs/read_write.c:1193 x64_sys_call+0x1fbb/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:21 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: 0033:0x7f7a6a8e2407 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:00007ffd81508ce0 EFLAGS: 00000202 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f7a6a858740 RCX: 00007f7a6a8e2407 RDX: 0000000000000002 RSI: 00007ffd81508d40 RDI: 0000000000000003 RBP: 0000000000000188 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd81508d80 R13: 000055b147ebcd70 R14: 00007ffd81508dd0 R15: 00007ffd81518fa0 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 89 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:ffffc9000322f028 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffff88810b35a510 RCX: dffffc0000000000 RDX: ffff888136cddf00 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc9000322f0a0 R08: 0000000000000003 R09: 0000000000000004 R10: 0000000000000000 R11: ffffffff83b98e90 R12: 0000000000000050 R13: ffff88810b35a500 R14: 1ffff1102166b4a0 R15: ffff888102750c90 FS: 00007f7a6a858740(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdd5cd0f00 CR3: 00000001341c4000 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 89 a1 26 fe call 0xfe26a19a 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