skbuff: skb_over_panic: text:ffffffff830a5b5f len:184 put:172 head:ffff88812ef4c800 data:ffff88812ef4c800 tail:0xb8 end:0x80 dev: ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 11468 Comm: syz-executor.3 Not tainted 5.10.75-syzkaller-01082-g234d53d2bb60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 2c 61 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc9000015fee8 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff85873820 RCX: e728d8ae47ee6c00 RDX: 0000000000000705 RSI: 0000000000000705 RDI: 0000000000000000 RBP: ffffc9000015ff30 R08: ffffffff81545368 R09: ffffed103ee295d8 R10: ffffed103ee295d8 R11: 0000000000000000 R12: ffff88812ef4c800 R13: 00000000000000b8 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000555556b6c400(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4befc55270 CR3: 0000000115662000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x2c/0x30 net/core/skbuff.c:115 skb_put+0x205/0x210 net/core/skbuff.c:1877 skb_put_zero include/linux/skbuff.h:2270 [inline] cdc_ncm_ndp16 drivers/net/usb/cdc_ncm.c:1116 [inline] cdc_ncm_fill_tx_frame+0x127f/0x3d50 drivers/net/usb/cdc_ncm.c:1293 cdc_ncm_tx_fixup+0x98/0xf0 drivers/net/usb/cdc_ncm.c:1514 usbnet_start_xmit+0x111/0x1a60 drivers/net/usb/usbnet.c:1338 __netdev_start_xmit include/linux/netdevice.h:4823 [inline] netdev_start_xmit include/linux/netdevice.h:4837 [inline] xmit_one+0x16a/0x480 net/core/dev.c:3583 dev_hard_start_xmit+0xad/0x1c0 net/core/dev.c:3599 sch_direct_xmit+0x28f/0x9b0 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x245/0x3e0 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:127 [inline] __dev_xmit_skb net/core/dev.c:3775 [inline] __dev_queue_xmit+0xe7e/0x2ac0 net/core/dev.c:4129 dev_queue_xmit+0x17/0x20 net/core/dev.c:4194 neigh_resolve_output+0x693/0x740 net/core/neighbour.c:1497 neigh_output include/net/neighbour.h:518 [inline] ip6_finish_output2+0x109c/0x1930 net/ipv6/ip6_output.c:145 __ip6_finish_output+0x610/0x7b0 net/ipv6/ip6_output.c:210 ip6_finish_output+0x3f/0x1e0 net/ipv6/ip6_output.c:220 NF_HOOK_COND include/linux/netfilter.h:293 [inline] ip6_output+0x211/0x4c0 net/ipv6/ip6_output.c:243 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:304 [inline] mld_sendpack+0x5fc/0xb20 net/ipv6/mcast.c:1676 mld_send_cr net/ipv6/mcast.c:1972 [inline] mld_ifc_timer_expire+0x85b/0xc50 net/ipv6/mcast.c:2471 call_timer_fn+0x35/0x280 kernel/time/timer.c:1420 expire_timers+0x21f/0x3b0 kernel/time/timer.c:1465 __run_timers+0x548/0x680 kernel/time/timer.c:1756 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1769 __do_softirq+0x27e/0x598 kernel/softirq.c:305 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:402 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:432 irq_exit_rcu+0x9/0x10 kernel/softirq.c:444 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1095 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x49/0x70 kernel/locking/spinlock.c:199 Code: 08 00 74 0c 48 c7 c7 d0 3c 4c 86 e8 a1 22 09 fd 48 83 3d 49 94 ae 01 00 74 2a 48 89 df e8 33 58 b5 fc 66 90 fb bf 01 00 00 00 22 23 ad fc 65 8b 05 e7 44 64 7b 85 c0 74 03 5b 5d c3 e8 a6 aa RSP: 0018:ffffc9000235fa28 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff8881f714de00 RCX: dffffc0000000000 RDX: 0000000040000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc9000235fa30 R08: ffffffff8189476f R09: fffffbfff0d7fa7f R10: fffffbfff0d7fa7f R11: 0000000000000000 R12: ffff8881f714de00 R13: ffff888110943b40 R14: dffffc0000000000 R15: 0000000000000000 finish_lock_switch kernel/sched/core.c:3753 [inline] finish_task_switch+0x130/0x5f0 kernel/sched/core.c:3853 context_switch kernel/sched/core.c:4018 [inline] __schedule+0x94c/0xda0 kernel/sched/core.c:4776 schedule+0x14b/0x1f0 kernel/sched/core.c:4854 freezable_schedule include/linux/freezer.h:177 [inline] do_nanosleep+0x1c3/0x6c0 kernel/time/hrtimer.c:1942 hrtimer_nanosleep+0x1c5/0x3d0 kernel/time/hrtimer.c:1995 common_nsleep+0x96/0xb0 kernel/time/posix-timers.c:1227 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] __se_sys_clock_nanosleep+0x308/0x390 kernel/time/posix-timers.c:1245 __x64_sys_clock_nanosleep+0x9b/0xb0 kernel/time/posix-timers.c:1245 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f37d1dfa70a Code: 83 ff 03 74 3b 48 83 ec 28 b8 fa ff ff ff 83 ff 02 49 89 ca 0f 44 f8 64 8b 04 25 18 00 00 00 85 c0 75 2d b8 e6 00 00 00 0f 05 <89> c2 f7 da 3d 00 f0 ff ff b8 00 00 00 00 0f 47 c2 48 83 c4 28 c3 RSP: 002b:00007ffcfdcce5b0 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 0000000000000e46 RCX: 00007f37d1dfa70a RDX: 00007ffcfdcce5f0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffcfdcce67c R08: 00007ffcfdcfb080 R09: 00007ffcfdcfb0b8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032 R13: 000000000026190e R14: 000000000000000d R15: 00007ffcfdcce6e0 Modules linked in: ---[ end trace ff220962d5a4e435 ]--- RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 2c 61 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc9000015fee8 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff85873820 RCX: e728d8ae47ee6c00 RDX: 0000000000000705 RSI: 0000000000000705 RDI: 0000000000000000 RBP: ffffc9000015ff30 R08: ffffffff81545368 R09: ffffed103ee295d8 R10: ffffed103ee295d8 R11: 0000000000000000 R12: ffff88812ef4c800 R13: 00000000000000b8 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000555556b6c400(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4befc55270 CR3: 0000000115662000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 00 or %al,(%rax) 2: 74 0c je 0x10 4: 48 c7 c7 d0 3c 4c 86 mov $0xffffffff864c3cd0,%rdi b: e8 a1 22 09 fd callq 0xfd0922b1 10: 48 83 3d 49 94 ae 01 cmpq $0x0,0x1ae9449(%rip) # 0x1ae9461 17: 00 18: 74 2a je 0x44 1a: 48 89 df mov %rbx,%rdi 1d: e8 33 58 b5 fc callq 0xfcb55855 22: 66 90 xchg %ax,%ax 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 22 23 ad fc callq 0xfcad2351 <-- trapping instruction 2f: 65 8b 05 e7 44 64 7b mov %gs:0x7b6444e7(%rip),%eax # 0x7b64451d 36: 85 c0 test %eax,%eax 38: 74 03 je 0x3d 3a: 5b pop %rbx 3b: 5d pop %rbp 3c: c3 retq 3d: e8 .byte 0xe8 3e: a6 cmpsb %es:(%rdi),%ds:(%rsi) 3f: aa stos %al,%es:(%rdi)