发生了什么事？第二天早上我尝试登录时系统没有响应。
Sep 21 12:38:02 pratchett org.freedesktop.Telepathy.AccountManager[2233]: (process:2488): GLib-GIO-WARNING **: netlink message was truncated; shouldn't happen...
Sep 21 12:38:02 pratchett kernel: [45277.692643] BUG: unable to handle kernel NULL pointer dereference at (null)
Sep 21 12:38:02 pratchett kernel: [45277.692685] IP: [<ffffffff816ad857>] skb_queue_tail+0x37/0x60
Sep 21 12:38:02 pratchett kernel: [45277.692714] PGD 877fe067 PUD 0
Sep 21 12:38:02 pratchett kernel: [45277.692731] Oops: 0002 [#1] SMP
Sep 21 12:38:02 pratchett kernel: [45277.692748] Modules linked in: xt_conntrack ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ctr ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables binfmt_misc rfcomm bnep dell_wmi sparse_keymap dell_laptop dcdbas snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic dm_multipath scsi_dh intel_rapl iosf_mbi snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_hda_controller coretemp snd_hda_codec arc4 kvm_intel snd_hwdep kvm crct10dif_pclmul ath9k crc32_pclmul snd_pcm ath9k_common uvcvideo ghash_clmulni_intel videobuf2_vmalloc videobuf2_memops ath9k_hw videobuf2_core v4l2_common videodev aesni_intel ath media aes_x86_64 lrw gf128mul snd_seq_midi glue_helper snd_seq_midi_event ablk_helper cryptd mac80211 ath3k btusb snd_rawmidi joydev bluetooth serio_raw snd_seq cfg80211 snd_seq_device snd_timer lpc_ich snd soundcore shpchp mei_me mei mac_hid parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper psmouse drm ahci libahci wmi video
Sep 21 12:38:02 pratchett kernel: [45277.693306] CPU: 2 PID: 9668 Comm: Chrome_ChildIOT Tainted: G OE 3.19.0-29-generic #31-Ubuntu
Sep 21 12:38:02 pratchett kernel: [45277.693345] Hardware name: Dell Inc. Dell System XPS L322X/0PJHXN, BIOS A09 05/15/2013
Sep 21 12:38:02 pratchett kernel: [45277.693383] task: ffff8801bf7489d0 ti: ffff8801f8c4c000 task.ti: ffff8801f8c4c000
Sep 21 12:38:02 pratchett kernel: [45277.693426] RIP: 0010:[<ffffffff816ad857>] [<ffffffff816ad857>] skb_queue_tail+0x37/0x60
Sep 21 12:38:02 pratchett kernel: [45277.693462] RSP: 0018:ffff8801f8c4fb38 EFLAGS: 00010046
Sep 21 12:38:02 pratchett kernel: [45277.693493] RAX: 0000000000000292 RBX: ffff8801c1ddb510 RCX: 0000000000000000
Sep 21 12:38:02 pratchett kernel: [45277.693533] RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff8801c1ddb524
Sep 21 12:38:02 pratchett kernel: [45277.693574] RBP: ffff8801f8c4fb58 R08: 0000000000000300 R09: ffff880236c03600
Sep 21 12:38:02 pratchett kernel: [45277.693605] R10: 0000000000000292 R11: ffff8801f8c4ffd8 R12: ffff8801c1ddb510
Sep 21 12:38:02 pratchett kernel: [45277.693635] R13: ffff8801c1ddb524 R14: ffff8801c1ddb480 R15: ffff8801c1ddaa00
Sep 21 12:38:02 pratchett kernel: [45277.693666] FS: 00007fb4c2de3700(0000) GS:ffff88023f280000(0000) knlGS:0000000000000000
Sep 21 12:38:02 pratchett kernel: [45277.693700] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 21 12:38:02 pratchett kernel: [45277.693724] CR2: 0000000000000000 CR3: 00000001724bf000 CR4: 00000000001407e0
Sep 21 12:38:02 pratchett kernel: [45277.693754] Stack:
Sep 21 12:38:02 pratchett kernel: [45277.693763] 0000000000000000 000000000000001c 0000000000000000 ffff8801c1ddb510
Sep 21 12:38:02 pratchett kernel: [45277.693796] ffff8801f8c4fc18 ffffffff81762ce4 ffff880200000000 ffff8801c1ddb510
Sep 21 12:38:02 pratchett kernel: [45277.693837] ffff8801f8c4ff08 ffff8801f8c4fc88 0000001c0000001c 000000000000001c
Sep 21 12:38:02 pratchett kernel: [45277.693870] Call Trace:
Sep 21 12:38:02 pratchett kernel: [45277.693889] [<ffffffff81762ce4>] unix_stream_sendmsg+0x1e4/0x450
Sep 21 12:38:02 pratchett kernel: [45277.693917] [<ffffffff816a584c>] do_sock_sendmsg+0x8c/0x100
Sep 21 12:38:02 pratchett kernel: [45277.693942] [<ffffffff816a51ec>] ? copy_msghdr_from_user+0x15c/0x210
Sep 21 12:38:02 pratchett kernel: [45277.693971] [<ffffffff816a5ea8>] ___sys_sendmsg+0x348/0x360
Sep 21 12:38:02 pratchett kernel: [45277.693997] [<ffffffff811fdcb0>] ? pipe_read+0x300/0x340
Sep 21 12:38:02 pratchett kernel: [45277.694022] [<ffffffff811f46de>] ? new_sync_read+0x7e/0xb0
Sep 21 12:38:02 pratchett kernel: [45277.694047] [<ffffffff8112c792>] ? seccomp_phase1+0x92/0x270
Sep 21 12:38:02 pratchett kernel: [45277.694073] [<ffffffff816a65c2>] __sys_sendmsg+0x42/0x80
Sep 21 12:38:02 pratchett kernel: [45277.694097] [<ffffffff816a6612>] SyS_sendmsg+0x12/0x20
Sep 21 12:38:02 pratchett kernel: [45277.694121] [<ffffffff817cbe4d>] system_call_fastpath+0x16/0x1b
Sep 21 12:38:02 pratchett kernel: [45277.694147] Code: 8d 6f 14 41 54 53 48 89 fb 4c 89 ef 49 89 f4 48 83 ec 08 e8 9c de 11 00 48 8b 53 08 49 89 1c 24 4c 89 ef 48 89 c6 49 89 54 24 08 <4c> 89 22 83 43 10 01 4c 89 63 08 e8 59 dd 11 00 48 83 c4 08 5b
Sep 21 12:38:02 pratchett kernel: [45277.694274] RIP [<ffffffff816ad857>] skb_queue_tail+0x37/0x60
Sep 21 12:38:02 pratchett kernel: [45277.694308] RSP <ffff8801f8c4fb38>
Sep 21 12:38:02 pratchett kernel: [45277.694324] CR2: 0000000000000000
Sep 21 12:38:02 pratchett kernel: [45277.705256] ---[ end trace 02518c17ce0e6e81 ]---
Sep 21 12:38:02 pratchett kernel: [45277.705258] BUG: unable to handle kernel paging request at ffff880334bc86c0
Sep 21 12:38:02 pratchett kernel: [45277.705261] IP: [<ffffffff816ae99d>] __alloc_skb+0x13d/0x1f0
Sep 21 12:38:02 pratchett kernel: [45277.705262] PGD 1fe5067 PUD 0
Sep 21 12:38:02 pratchett kernel: [45277.705263] Oops: 0002 [#2] SMP
Sep 21 12:38:02 pratchett kernel: [45277.705287] Modules linked in: xt_conntrack ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ctr ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables binfmt_misc rfcomm bnep dell_wmi sparse_keymap dell_laptop dcdbas snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic dm_multipath scsi_dh intel_rapl iosf_mbi snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_hda_controller coretemp snd_hda_codec arc4 kvm_intel snd_hwdep kvm crct10dif_pclmul ath9k crc32_pclmul snd_pcm ath9k_common uvcvideo ghash_clmulni_intel videobuf2_vmalloc videobuf2_memops ath9k_hw videobuf2_core v4l2_common videodev aesni_intel ath media aes_x86_64 lrw gf128mul snd_seq_midi glue_helper snd_seq_midi_event ablk_helper cryptd mac80211 ath3k btusb snd_rawmidi joydev bluetooth serio_raw snd_seq cfg80211 snd_seq_device snd_timer lpc_ich snd soundcore shpchp mei_me mei mac_hid parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper psmouse drm ahci libahci wmi video
Sep 21 12:38:02 pratchett kernel: [45277.705307] CPU: 3 PID: 3099 Comm: Chrome_IOThread Tainted: G D OE 3.19.0-29-generic #31-Ubuntu
Sep 21 12:38:02 pratchett kernel: [45277.705309] Hardware name: Dell Inc. Dell System XPS L322X/0PJHXN, BIOS A09 05/15/2013
Sep 21 12:38:02 pratchett kernel: [45277.705310] task: ffff88009f8389d0 ti: ffff88020ed3c000 task.ti: ffff88020ed3c000
Sep 21 12:38:02 pratchett kernel: [45277.705312] RIP: 0010:[<ffffffff816ae99d>] [<ffffffff816ae99d>] __alloc_skb+0x13d/0x1f0
Sep 21 12:38:02 pratchett kernel: [45277.705313] RSP: 0018:ffff88020ed3fa18 EFLAGS: 00010246
Sep 21 12:38:02 pratchett kernel: [45277.705313] RAX: 00000000ffffffff RBX: ffff880234bc9e00 RCX: 00000000ffffffff
Sep 21 12:38:02 pratchett kernel: [45277.705314] RDX: ffff880334bc86c0 RSI: 0000000000000000 RDI: ffff880234bc9ec8
Sep 21 12:38:02 pratchett kernel: [45277.705315] RBP: ffff88020ed3fa68 R08: 0000000000000200 R09: ffff880236c03700
Sep 21 12:38:02 pratchett kernel: [45277.705316] R10: ffff880236c03700 R11: ffff88020ed3ffd8 R12: ffff880234bc8700
Sep 21 12:38:02 pratchett kernel: [45277.705317] R13: 00000000ffffffff R14: ffff880236c03700 R15: 0000000000000000
Sep 21 12:38:02 pratchett kernel: [45277.705318] FS: 00007fca07fbb700(0000) GS:ffff88023f2c0000(0000) knlGS:0000000000000000
Sep 21 12:38:02 pratchett kernel: [45277.705319] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 21 12:38:02 pratchett kernel: [45277.705320] CR2: ffff880334bc86c0 CR3: 00000000a0456000 CR4: 00000000001407e0
Sep 21 12:38:02 pratchett kernel: [45277.705320] Stack:
Sep 21 12:38:02 pratchett kernel: [45277.705322] ffff88020ed3fa68 00000000810ac875 ffff88020ed3fae8 0000000000000004
Sep 21 12:38:02 pratchett kernel: [45277.705324] ffff88020ed3fa88 0000000000000003 0000000000000000 ffff88020ed3fb18
Sep 21 12:38:02 pratchett kernel: [45277.705325] ffff8801c1ddb480 0000000000000000 ffff88020ed3fac8 ffffffff816af427
Sep 21 12:38:02 pratchett kernel: [45277.705326] Call Trace:
Sep 21 12:38:02 pratchett kernel: [45277.705328] [<ffffffff816af427>] alloc_skb_with_frags+0x57/0x1f0
Sep 21 12:38:02 pratchett kernel: [45277.705332] [<ffffffff810ac875>] ? update_curr+0x75/0x180
Sep 21 12:38:02 pratchett kernel: [45277.705334] [<ffffffff816aa94e>] sock_alloc_send_pskb+0x1de/0x260
Sep 21 12:38:02 pratchett kernel: [45277.705336] [<ffffffff817654b7>] ? wait_for_unix_gc+0x27/0x90
Sep 21 12:38:02 pratchett kernel: [45277.705338] [<ffffffff81762da9>] unix_stream_sendmsg+0x2a9/0x450
Sep 21 12:38:02 pratchett kernel: [45277.705341] [<ffffffff816a584c>] do_sock_sendmsg+0x8c/0x100
Sep 21 12:38:02 pratchett kernel: [45277.705343] [<ffffffff816a51ec>] ? copy_msghdr_from_user+0x15c/0x210
Sep 21 12:38:02 pratchett kernel: [45277.705345] [<ffffffff816a5ea8>] ___sys_sendmsg+0x348/0x360
Sep 21 12:38:02 pratchett kernel: [45277.705347] [<ffffffff811f75f5>] ? __sb_end_write+0x35/0x70
Sep 21 12:38:02 pratchett kernel: [45277.705349] [<ffffffff811fd8f3>] ? pipe_write+0x393/0x450
Sep 21 12:38:02 pratchett kernel: [45277.705353] [<ffffffff812353de>] ? fsnotify+0x37e/0x530
Sep 21 12:38:02 pratchett kernel: [45277.705355] [<ffffffff811f4791>] ? new_sync_write+0x81/0xb0
Sep 21 12:38:02 pratchett kernel: [45277.705357] [<ffffffff816a65c2>] __sys_sendmsg+0x42/0x80
Sep 21 12:38:02 pratchett kernel: [45277.705360] [<ffffffff817c6f5c>] ? __schedule+0x39c/0x8e0
Sep 21 12:38:02 pratchett kernel: [45277.705363] [<ffffffff816a6612>] SyS_sendmsg+0x12/0x20
Sep 21 12:38:02 pratchett kernel: [45277.705364] [<ffffffff817cbe4d>] system_call_fastpath+0x16/0x1b
Sep 21 12:38:02 pratchett kernel: [45277.705383] Code: 83 e1 01 83 e0 f7 c1 e1 03 09 c1 b8 ff ff ff ff 85 f6 88 8b 90 00 00 00 b9 ff ff ff ff 66 89 83 c6 00 00 00 66 89 8b c2 00 00 00 <48> c7 02 00 00 00 00 48 c7 42 08 00 00 00 00 48 c7 42 10 00 00
Sep 21 12:38:02 pratchett kernel: [45277.705385] RIP [<ffffffff816ae99d>] __alloc_skb+0x13d/0x1f0
Sep 21 12:38:02 pratchett kernel: [45277.705386] RSP <ffff88020ed3fa18>
Sep 21 12:38:02 pratchett kernel: [45277.705386] CR2: ffff880334bc86c0
Sep 21 12:38:02 pratchett kernel: [45277.705387] ---[ end trace 02518c17ce0e6e82 ]--
答案1
这是一个内核错误——任何程序采取的任何操作都不会导致内核崩溃。
从堆栈跟踪来判断：
sendmsgTelepathy 使用系统调用在类型为 的套接字上发送一条消息PF_UNIX。- 这个过程是在一个安全计算隔间，即没有直接的系统访问权限，因此系统调用是通过将参数编组到数据结构并将它们发送到另一个进程来处理的（以便该进程可以查看是否允许访问，从而实现比内核允许的更复杂的策略）。
- 该消息被附加到套接字，然后套接字会将其传输到处理该消息的程序。
在此附加操作期间，会发现无效指针。如果数据结构未初始化，则可能会发生这种情况，但如果存在代码路径，导致未初始化的结构在本应有效的某个地方留下，则这肯定是内核错误。
第二个错误是第一个错误的重复——数据结构在此期间没有任何改善。
在这种情况下，我会将此报告为您正在使用的内核包的一个错误linux-image-3.19.0-29-generic。如果问题可以重现，请提供重现说明。
这似乎是 Chrome 和 Telepathy 之间一种奇怪的互动，可能本身就值得调查，但主要问题是，有一种方法可以达到无效状态，而这种情况永远不应该发生。