====================================== | [ 2.868157] GACT probability NOT on | [ 3.006528] ------------[ cut here ]------------ | [ 3.006586] kernel BUG at net/core/skbuff.c:3505! | [ 3.006644] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [ 3.006768] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 3.006867] Workqueue: ipv6_addrconf addrconf_dad_work [ 3.006931] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 3.006979] Code: 89 5c 24 04 44 89 d9 44 89 ff 44 89 ea ff d0 0f 1f 00 44 8b 5c 24 04 41 89 c7 eb b6 ff d0 0f 1f 00 41 89 c1 e9 71 fd ff ff 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 All code ======== 0: 89 5c 24 04 mov %ebx,0x4(%rsp) 4: 44 89 d9 mov %r11d,%ecx 7: 44 89 ff mov %r15d,%edi a: 44 89 ea mov %r13d,%edx d: ff d0 call *%rax f: 0f 1f 00 nopl (%rax) 12: 44 8b 5c 24 04 mov 0x4(%rsp),%r11d 17: 41 89 c7 mov %eax,%r15d 1a: eb b6 jmp 0xffffffffffffffd2 1c: ff d0 call *%rax 1e: 0f 1f 00 nopl (%rax) 21: 41 89 c1 mov %eax,%r9d 24: e9 71 fd ff ff jmp 0xfffffffffffffd9a 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 33: 00 00 00 00 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 00 d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop [ 3.007134] RSP: 0018:ffffb56e40003db0 EFLAGS: 00010202 [ 3.007187] RAX: 000000000000006e RBX: 0000000000000008 RCX: ffff8a28026db500 [ 3.007251] RDX: ffff8a2801ede2c0 RSI: 0000000000000100 RDI: ffff8a2801ede1c0 [ 3.007323] RBP: ffffb56e40003e08 R08: ffffb56e40003e08 R09: 00000000c2660303 [ 3.007388] R10: 0000000000000008 R11: ffff8a28037f6000 R12: ffffffff894bba80 [ 3.007453] R13: 0000000000000008 R14: 0000000000000000 R15: 00000000c2660303 [ 3.007515] FS: 0000000000000000(0000) GS:ffff8a283ec00000(0000) knlGS:0000000000000000 [ 3.007581] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.007639] CR2: 00007f4969cde000 CR3: 0000000009e3e002 CR4: 0000000000770ef0 [ 3.007708] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 3.007781] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 3.007845] PKRU: 55555554 [ 3.007867] Call Trace: [ 3.007894] <IRQ> [ 3.007923] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) [ 3.007962] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) [ 3.008009] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 3.008047] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) [ 3.008088] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 3.008123] ? exc_invalid_op (arch/x86/kernel/traps.c:265) [ 3.008170] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 3.008210] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 3.008249] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 3.008283] __skb_checksum_complete (./arch/x86/include/asm/checksum_64.h:170 ./arch/x86/include/asm/checksum_64.h:180 net/core/skbuff.c:3643) [ 3.008324] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) [ 3.008375] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) [ 3.008425] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) [ 3.008471] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) [ 3.008529] ip_local_deliver_finish (./include/linux/rcupdate.h:782 net/ipv4/ip_input.c:234) [ 3.008576] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) [ 3.008635] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) [ 3.008679] __napi_poll (net/core/dev.c:6703) [ 3.008725] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) [ 3.008763] __do_softirq (kernel/softirq.c:553) [ 3.008805] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) [ 3.008853] </IRQ> [ 3.008873] <TASK> [ 3.008894] __local_bh_enable_ip (kernel/softirq.c:381) [ 3.008928] __dev_queue_xmit (net/core/dev.c:4400) [ 3.008963] ? eth_header (net/ethernet/eth.c:85) [ 3.009010] ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137) [ 3.009051] ? __schedule (kernel/sched/core.c:6733) [ 3.009090] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) [ 3.009124] ndisc_send_skb (net/ipv6/ndisc.c:512 (discriminator 60)) [ 3.009167] ndisc_send_ns (net/ipv6/ndisc.c:668) [ 3.009208] addrconf_dad_work (net/ipv6/addrconf.c:4281) [ 3.009248] process_one_work (kernel/workqueue.c:2633) [ 3.009282] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 3.009325] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 3.009379] kthread (kernel/kthread.c:388) [ 3.009416] ? __pfx_kthread (kernel/kthread.c:341) [ 3.009460] ret_from_fork (arch/x86/kernel/process.c:147) [ 3.009504] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: __skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu