Comment 2 for bug 1456279

The kernel panic:

------------[ cut here ]------------
[ 230.528076] kernel BUG at /build/buildd/linux-lts-utopic-3.16.0/net/ipv4/tcp_output.c:878!
[ 230.528155] invalid opcode: 0000 [#1] SMP
[ 230.528203] Modules linked in: rpcsec_gss_krb5 nfsv4 nls_utf8 isofs vhost_net vhost macvtap macvlan autofs4 bridge stp llc arc4 iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_conexant snd_hda_codec_generic iwlwifi crct10dif_pclmul btusb crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_controller nfsd snd_hda_codec aesni_intel auth_rpcgss nfs_acl snd_hwdep aes_x86_64 snd_seq_midi snd_seq_midi_event lrw thinkpad_acpi bluetooth cfg80211 snd_pcm gf128mul glue_helper snd_rawmidi rtsx_pci_ms ablk_helper nfs snd_seq cryptd memstick snd_seq_device 6lowpan_iphc snd_timer nvram joydev lockd parport_pc snd sunrpc ppdev mei_me mei shpchp soundcore serio_raw binfmt_misc fscache mac_hid lp parport btrfs xor raid6_pq i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc psmouse r8169 ahci drm mii rtsx_pci libahci wmi video
[ 230.529160] CPU: 1 PID: 2419 Comm: Chrome_IOThread Not tainted 3.16.0-37-generic #51~14.04.1-Ubuntu
[ 230.529223] Hardware name: LENOVO 6885EXG/6885EXG, BIOS HEET47WW (1.28 ) 10/24/2014
[ 230.529247] task: ffff880402cdbd20 ti: ffff8803d3948000 task.ti: ffff8803d3948000
[ 230.529270] RIP: 0010:[<ffffffff816b845f>] [<ffffffff816b845f>] tcp_transmit_skb+0x72f/0x900
[ 230.529302] RSP: 0018:ffff8803d394bae8 EFLAGS: 00010246
[ 230.529319] RAX: 00000000000002c0 RBX: ffff8800c1490700 RCX: 00000000000000d0
[ 230.529352] RDX: 0000000000000001 RSI: ffff880403bdf600 RDI: ffff8803d0d01000
[ 230.529397] RBP: ffff8803d394bb40 R08: 00000000000002c0 R09: 0000000000000500
[ 230.529441] R10: ffff88040dc03500 R11: ffff8800c1490ce4 R12: ffff880403bdf600
[ 230.529486] R13: ffff8803d0ca1700 R14: 00000000000000ae R15: ffff880403bdf600
[ 230.529531] FS: 00007f8314069700(0000) GS:ffff88041e240000(0000) knlGS:0000000000000000
[ 230.529581] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 230.529617] CR2: 00003d742c856008 CR3: 00000003d8e52000 CR4: 00000000001407e0
[ 230.529661] Stack:
[ 230.529676] 00ff8803d0ca1700 ffff8800c1490700 00000000000000b0 ffff8800c1490700
[ 230.529732] 00000000000000ae ffffffff81398a63 ffff8800c1490700 ffff880403bdee00
[ 230.529787] ffff8803d0ca1700 00000000000000ae ffff880403bdf600 ffff8803d394bb98
[ 230.529841] Call Trace:
[ 230.529864] [<ffffffff81398a63>] ? memcpy_fromiovecend+0x83/0xb0
[ 230.529905] [<ffffffff816b9a9e>] tcp_connect+0x47e/0x7a0
[ 230.529943] [<ffffffff816be537>] tcp_v4_connect+0x317/0x470
[ 230.529981] [<ffffffff816d3fd5>] __inet_stream_connect+0xa5/0x320
[ 230.530023] [<ffffffff813863f0>] ? cpumask_next_and+0x30/0x50
[ 230.530065] [<ffffffff811b79c6>] ? kmem_cache_alloc_trace+0x1c6/0x1f0
[ 230.530108] [<ffffffff816aad23>] ? tcp_sendmsg+0x4e3/0xce0
[ 230.530145] [<ffffffff816aad60>] tcp_sendmsg+0x520/0xce0
[ 230.530185] [<ffffffff8133457d>] ? aa_sk_perm.isra.4+0x6d/0x150
[ 230.530225] [<ffffffff816d52d4>] inet_sendmsg+0x64/0xb0
[ 230.530261] [<ffffffff81329c31>] ? apparmor_socket_sendmsg+0x21/0x30
[ 230.530304] [<ffffffff81648bbb>] sock_sendmsg+0x8b/0xc0
[ 230.530342] [<ffffffff811f11e5>] ? __fget_light+0x25/0x70
[ 230.530378] [<ffffffff811f1243>] ? __fdget+0x13/0x20
[ 230.530424] [<ffffffff81648d61>] SYSC_sendto+0x121/0x1c0
[ 230.530467] [<ffffffff811d42f1>] ? vfs_read+0xf1/0x170
[ 230.530505] [<ffffffff8164983e>] SyS_sendto+0xe/0x10
[ 230.530576] [<ffffffff8176d20d>] system_call_fastpath+0x1a/0x1f
[ 230.530638] Code: 58 ab f9 ff 49 89 c4 e9 7a f9 ff ff 8b 8b c4 05 00 00 89 ca d1 e9 c1 ea 02 01 d1 8b 93 c0 05 00 00 39 d1 0f 43 d1 e9 39 ff ff ff <0f> 0b 41 8b 54 24 40 39 c2 0f 89 9d fb ff ff 8d 88 00 00 ff ff
[ 230.530951] RIP [<ffffffff816b845f>] tcp_transmit_skb+0x72f/0x900
[ 230.533192] RSP <ffff8803d394bae8>
[ 230.543212] ---[ end trace 132cb34755df885a ]---
[ 247.400843] ------------[ cut here ]------------
[ 247.401956] kernel BUG at /build/buildd/linux-lts-utopic-3.16.0/net/ipv4/tcp_output.c:878!
[ 247.403046] invalid opcode: 0000 [#2] SMP
[ 247.404004] Modules linked in: rpcsec_gss_krb5 nfsv4 nls_utf8 isofs vhost_net vhost macvtap macvlan autofs4 bridge stp llc arc4 iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_conexant snd_hda_codec_generic iwlwifi crct10dif_pclmul btusb crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_controller nfsd snd_hda_codec aesni_intel auth_rpcgss nfs_acl snd_hwdep aes_x86_64 snd_seq_midi snd_seq_midi_event lrw thinkpad_acpi bluetooth cfg80211 snd_pcm gf128mul glue_helper snd_rawmidi rtsx_pci_ms ablk_helper nfs snd_seq cryptd memstick snd_seq_device 6lowpan_iphc snd_timer nvram joydev lockd parport_pc snd sunrpc ppdev mei_me mei shpchp soundcore serio_raw binfmt_misc fscache mac_hid lp parport btrfs xor raid6_pq i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc psmouse r8169 ahci drm mii rtsx_pci libahci wmi video
[ 247.410093] CPU: 0 PID: 2627 Comm: Chrome_IOThread Tainted: G D 3.16.0-37-generic #51~14.04.1-Ubuntu
[ 247.411110] Hardware name: LENOVO 6885EXG/6885EXG, BIOS HEET47WW (1.28 ) 10/24/2014
[ 247.412118] task: ffff880405fb0a30 ti: ffff8800c1cc8000 task.ti: ffff8800c1cc8000
[ 247.413112] RIP: 0010:[<ffffffff816b845f>] [<ffffffff816b845f>] tcp_transmit_skb+0x72f/0x900
[ 247.414136] RSP: 0018:ffff8800c1ccbae8 EFLAGS: 00010246
[ 247.415148] RAX: 00000000000002c0 RBX: ffff880405eeb800 RCX: 00000000000000d0
[ 247.416181] RDX: 0000000000000001 RSI: ffff880404338a00 RDI: ffff880407394400
[ 247.417205] RBP: ffff8800c1ccbb40 R08: 00000000000002c0 R09: 0000000000000500
[ 247.418239] R10: ffff88040dc03500 R11: ffff880405eebde4 R12: ffff880404338a00
[ 247.419265] R13: ffff8803d0e44040 R14: 00000000000000d0 R15: ffff880404338a00
[ 247.420289] FS: 00007f03c7eba700(0000) GS:ffff88041e200000(0000) knlGS:0000000000000000
[ 247.421318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 247.422338] CR2: 000010a8fed34008 CR3: 00000003d3bf1000 CR4: 00000000001407f0
[ 247.423364] Stack:
[ 247.424377] 00ff8803d0e44040 ffff880405eeb800 00000000000000d0 ffff880405eeb800
[ 247.425417] 00000000000000d0 ffffffff81398a63 ffff880405eeb800 ffff88040433a600
[ 247.426454] ffff8803d0e44040 00000000000000d0 ffff880404338a00 ffff8800c1ccbb98
[ 247.427493] Call Trace:
[ 247.428529] [<ffffffff81398a63>] ? memcpy_fromiovecend+0x83/0xb0
[ 247.429577] [<ffffffff816b9a9e>] tcp_connect+0x47e/0x7a0
[ 247.430616] [<ffffffff816be537>] tcp_v4_connect+0x317/0x470
[ 247.431653] [<ffffffff816d3fd5>] __inet_stream_connect+0xa5/0x320
[ 247.432692] [<ffffffff813863f0>] ? cpumask_next_and+0x30/0x50
[ 247.433739] [<ffffffff811b79c6>] ? kmem_cache_alloc_trace+0x1c6/0x1f0
[ 247.434796] [<ffffffff816aad23>] ? tcp_sendmsg+0x4e3/0xce0
[ 247.436124] [<ffffffff816aad60>] tcp_sendmsg+0x520/0xce0
[ 247.437805] [<ffffffff8133457d>] ? aa_sk_perm.isra.4+0x6d/0x150
[ 247.439461] [<ffffffff816d52d4>] inet_sendmsg+0x64/0xb0
[ 247.441059] [<ffffffff81329c31>] ? apparmor_socket_sendmsg+0x21/0x30
[ 247.442695] [<ffffffff81648bbb>] sock_sendmsg+0x8b/0xc0
[ 247.444318] [<ffffffff811f11e5>] ? __fget_light+0x25/0x70
[ 247.445664] [<ffffffff811f1243>] ? __fdget+0x13/0x20
[ 247.447109] [<ffffffff81648d61>] SYSC_sendto+0x121/0x1c0
[ 247.448613] [<ffffffff811d42f1>] ? vfs_read+0xf1/0x170
[ 247.449804] [<ffffffff8164983e>] SyS_sendto+0xe/0x10
[ 247.451250] [<ffffffff8176d20d>] system_call_fastpath+0x1a/0x1f
[ 247.452610] Code: 58 ab f9 ff 49 89 c4 e9 7a f9 ff ff 8b 8b c4 05 00 00 89 ca d1 e9 c1 ea 02 01 d1 8b 93 c0 05 00 00 39 d1 0f 43 d1 e9 39 ff ff ff <0f> 0b 41 8b 54 24 40 39 c2 0f 89 9d fb ff ff 8d 88 00 00 ff ff
[ 247.455563] RIP [<ffffffff816b845f>] tcp_transmit_skb+0x72f/0x900
[ 247.457061] RSP <ffff8800c1ccbae8>
[ 247.458581] ---[ end trace 132cb34755df885b ]---