skbuff: skb_over_panic: text:ffffffff82b1da03 len:184 put:172 head:ffff8881dc143400 data:ffff8881dc143400 tail:0xb8 end:0x80 dev: ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.161-syzkaller-00001-g2d28921044b9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x14d/0x150 net/core/skbuff.c:105 Code: 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 49 89 e9 b8 00 00 00 00 53 41 55 41 54 41 57 e8 73 ba ed fd 48 83 c4 20 <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 4d 89 cd 4c 89 RSP: 0018:ffff8881f6e09460 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff851bf880 RCX: ef731b58cff8d000 RDX: 0000000000000704 RSI: 0000000000000704 RDI: 0000000000000000 RBP: ffff8881dc143400 R08: ffffffff814b15ec R09: ffffed103edcaa08 R10: ffffed103edcaa08 R11: 0000000000000000 R12: 00000000000000b8 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881dc143400 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f272a908ff8 CR3: 00000001e49e2000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x25/0x30 net/core/skbuff.c:114 skb_put+0x1e0/0x1e0 net/core/skbuff.c:1877 skb_put_zero include/linux/skbuff.h:2251 [inline] cdc_ncm_ndp drivers/net/usb/cdc_ncm.c:1104 [inline] cdc_ncm_fill_tx_frame+0xcf3/0x2be0 drivers/net/usb/cdc_ncm.c:1211 cdc_ncm_tx_fixup+0x62/0xa0 drivers/net/usb/cdc_ncm.c:1405 usbnet_start_xmit+0x107/0x1a40 drivers/net/usb/usbnet.c:1363 __netdev_start_xmit include/linux/netdevice.h:4510 [inline] netdev_start_xmit include/linux/netdevice.h:4524 [inline] xmit_one+0xfa/0x470 net/core/dev.c:3209 dev_hard_start_xmit+0xac/0x1b0 net/core/dev.c:3225 sch_direct_xmit+0x212/0x930 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x1ea/0x3a0 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:122 [inline] __dev_xmit_skb net/core/dev.c:3401 [inline] __dev_queue_xmit+0xc07/0x2c30 net/core/dev.c:3755 neigh_output include/net/neighbour.h:525 [inline] ip6_finish_output2+0xf45/0x1810 net/ipv6/ip6_output.c:144 NF_HOOK_COND include/linux/netfilter.h:297 [inline] ip6_output+0x158/0x380 net/ipv6/ip6_output.c:242 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] mld_sendpack+0x540/0xa20 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x804/0xb30 net/ipv6/mcast.c:2474 call_timer_fn+0x30/0x330 kernel/time/timer.c:1418 expire_timers+0x21e/0x3f0 kernel/time/timer.c:1463 __run_timers+0x573/0x670 kernel/time/timer.c:1787 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800 __do_softirq+0x23e/0x615 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:538 [inline] smp_apic_timer_interrupt+0x113/0x420 arch/x86/kernel/apic/apic.c:1150 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:831 RIP: 0010:default_idle+0x1f/0x30 arch/x86/kernel/process.c:573 Code: 90 90 90 90 90 90 90 90 90 90 90 e8 db 45 fb fd bf 01 00 00 00 89 c6 e8 1f 9b 03 fd e9 07 00 00 00 0f 00 2d 63 50 62 00 fb f4 bc 45 fb fd bf ff ff ff ff 89 c6 e9 00 9b 03 fd 41 57 41 56 53 RSP: 0018:ffffffff85c07e88 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffffff85c18a40 RCX: ffffffff85c18a40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff821f62c4 R09: fffffbfff0b83149 R10: fffffbfff0b83149 R11: 0000000000000000 R12: 0000000000000000 R13: 1ffffffff0b83148 R14: ffffffff862755e0 R15: dffffc0000000000 default_idle_call kernel/sched/idle.c:94 [inline] cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1c3/0x530 kernel/sched/idle.c:264 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:356 start_kernel+0x6e0/0x78b init/main.c:1049 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 Modules linked in: ---[ end trace f49d62db71f191ca ]--- RIP: 0010:skb_panic+0x14d/0x150 net/core/skbuff.c:105 Code: 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 49 89 e9 b8 00 00 00 00 53 41 55 41 54 41 57 e8 73 ba ed fd 48 83 c4 20 <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 4d 89 cd 4c 89 RSP: 0018:ffff8881f6e09460 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff851bf880 RCX: ef731b58cff8d000 RDX: 0000000000000704 RSI: 0000000000000704 RDI: 0000000000000000 RBP: ffff8881dc143400 R08: ffffffff814b15ec R09: ffffed103edcaa08 R10: ffffed103edcaa08 R11: 0000000000000000 R12: 00000000000000b8 R13: 0000000000000080 R14: dffffc0000000000 R15: ffff8881dc143400 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f272a908ff8 CR3: 00000001e49e2000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: e8 db 45 fb fd callq 0xfdfb45eb 10: bf 01 00 00 00 mov $0x1,%edi 15: 89 c6 mov %eax,%esi 17: e8 1f 9b 03 fd callq 0xfd039b3b 1c: e9 07 00 00 00 jmpq 0x28 21: 0f 00 2d 63 50 62 00 verw 0x625063(%rip) # 0x62508b 28: fb sti 29: f4 hlt * 2a: e8 bc 45 fb fd callq 0xfdfb45eb <-- trapping instruction 2f: bf ff ff ff ff mov $0xffffffff,%edi 34: 89 c6 mov %eax,%esi 36: e9 00 9b 03 fd jmpq 0xfd039b3b 3b: 41 57 push %r15 3d: 41 56 push %r14 3f: 53 push %rbx