skbuff: skb_over_panic: text:ffffffff830a5b5f len:184 put:172 head:ffff888150ace800 data:ffff888150ace800 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: 9961 Comm: sed Tainted: G W 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: 0000:ffffc9000015fee8 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff85873b60 RCX: 307dc6cb31b9cd00 RDX: 0000000000000704 RSI: 0000000000000704 RDI: 0000000000000000 RBP: ffffc9000015ff30 R08: ffffffff81545368 R09: fffff5200002bf05 R10: fffff5200002bf05 R11: 0000000000000000 R12: ffff888150ace800 R13: 00000000000000b8 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007face5f25800(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007face5fef6a0 CR3: 0000000112c9b000 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:__sanitizer_cov_trace_const_cmp8+0x1/0xa0 kernel/kcov.c:290 Code: 00 48 89 54 f9 08 48 c1 e0 03 48 83 c8 18 48 89 34 01 4c 89 44 f9 18 49 ff c2 4c 89 11 5d c3 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 4c 8b 45 08 65 48 8b 14 25 80 ed 01 00 65 8b 05 c4 ef 94 RSP: 0000:ffffc900044c7910 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff888104de2780 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900044c7a88 R08: ffffffff819012ce R09: fffff94000fb86e1 R10: fffff94000fb86e1 R11: 0000000000000000 R12: ffffc900044c7ce0 R13: ffff88810d409f78 R14: 0000000000000000 R15: 1ffff92000898f3d do_fault_around mm/memory.c:4285 [inline] do_read_fault+0x3ee/0x700 mm/memory.c:4300 do_fault mm/memory.c:4434 [inline] handle_pte_fault+0x547/0xac0 mm/memory.c:4701 __handle_mm_fault mm/memory.c:4843 [inline] handle_mm_fault+0x11c9/0x1a40 mm/memory.c:5196 do_user_addr_fault+0x6a2/0xd70 arch/x86/mm/fault.c:1396 handle_page_fault arch/x86/mm/fault.c:1462 [inline] exc_page_fault+0x98/0x2d0 arch/x86/mm/fault.c:1518 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0033:0x7face5fef6a0 Code: Unable to access opcode bytes at RIP 0x7face5fef676. RSP: 002b:00007fff64d06078 EFLAGS: 00010202 RAX: 00007face617d690 RBX: 00007face617d698 RCX: 00007face61809e0 RDX: 00007fff64d06120 RSI: 00007fff64d060f8 RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fff64d05fa0 R11: 0000000000000246 R12: 00007fff64d060f8 R13: 00007fff64d06120 R14: 00007face617d6a0 R15: 0000000000000000 Modules linked in: ---[ end trace 61cea7b9ff30e8ee ]--- 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: 0000:ffffc9000015fee8 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff85873b60 RCX: 307dc6cb31b9cd00 RDX: 0000000000000704 RSI: 0000000000000704 RDI: 0000000000000000 RBP: ffffc9000015ff30 R08: ffffffff81545368 R09: fffff5200002bf05 R10: fffff5200002bf05 R11: 0000000000000000 R12: ffff888150ace800 R13: 00000000000000b8 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007face5f25800(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007face5fef676 CR3: 0000000112c9b000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: 54 push %rsp 4: f9 stc 5: 08 48 c1 or %cl,-0x3f(%rax) 8: e0 03 loopne 0xd a: 48 83 c8 18 or $0x18,%rax e: 48 89 34 01 mov %rsi,(%rcx,%rax,1) 12: 4c 89 44 f9 18 mov %r8,0x18(%rcx,%rdi,8) 17: 49 ff c2 inc %r10 1a: 4c 89 11 mov %r10,(%rcx) 1d: 5d pop %rbp 1e: c3 retq 1f: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 26: 00 00 00 29: 55 push %rbp * 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction 2d: 4c 8b 45 08 mov 0x8(%rbp),%r8 31: 65 48 8b 14 25 80 ed mov %gs:0x1ed80,%rdx 38: 01 00 3a: 65 gs 3b: 8b .byte 0x8b 3c: 05 .byte 0x5 3d: c4 .byte 0xc4 3e: ef out %eax,(%dx) 3f: 94 xchg %eax,%esp