当我的 Ubuntu 机器挂起时，我遇到了问题（键盘、鼠标停止响应，屏幕看起来模糊）。此外，整个 LAN/WAN 网络停止响应。
DISTRIB_RELEASE=15.04
DISTRIB_DESCRIPTION="Ubuntu 15.04"
来自 /var/log/syslog 文件的日志：
Dec 29 15:37:24 PC040 kernel: [21333.008034] ------------[ cut here ]------------
Dec 29 15:37:24 PC040 kernel: [21333.008047] WARNING: CPU: 0 PID: 1614 at /build/linux-Y0uW00/linux-3.19.0/net/sched/sch_generic.c:303 dev_watchdog+0x1fe/0x210()
Dec 29 15:37:24 PC040 kernel: [21333.008050] NETDEV WATCHDOG: eth1 (forcedeth): transmit queue 0 timed out
Dec 29 15:37:24 PC040 kernel: [21333.008052] Modules linked in: cfg80211 snd_hda_codec_realtek snd_hda_codec_generic nouveau snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep mxm_wmi snd_pcm wmi video snd_seq_midi ttm snd_seq_midi_event drm_kms_helper drm snd_rawmidi snd_seq edac_core i2c_algo_bit snd_seq_device edac_mce_amd snd_timer k8temp serio_raw snd soundcore shpchp 8250_fintek i2c_nforce2 tpm_infineon mac_hid parport_pc ppdev lp parport autofs4 pata_acpi hid_generic usbhid hid forcedeth pata_amd sata_nv floppy
Dec 29 15:37:24 PC040 kernel: [21333.008089] CPU: 0 PID: 1614 Comm: firefox Tainted: P OE 3.19.0-33-generic #38-Ubuntu
Dec 29 15:37:24 PC040 kernel: [21333.008091] Hardware name: Kobian KN6100M/KN6100M, BIOS 6.00 PG 06/01/2007
Dec 29 15:37:24 PC040 kernel: [21333.008094] 00000000 00000000 f4c39ebc c16ec002 f4c39f00 f4c39ef0 c106177b c1995ee0
Dec 29 15:37:24 PC040 kernel: [21333.008099] f4c39f1c 0000064e c1995f1c 0000012f c161ef9e 0000012f c161ef9e 00000000
Dec 29 15:37:24 PC040 kernel: [21333.008104] f4e9b000 fffffc83 f4c39f08 c10617e3 00000009 f4c39f00 c1995ee0 f4c39f1c
Dec 29 15:37:24 PC040 kernel: [21333.008109] Call Trace:
Dec 29 15:37:24 PC040 kernel: [21333.008117] [] dump_stack+0x41/0x52
Dec 29 15:37:24 PC040 kernel: [21333.008122] [] warn_slowpath_common+0x8b/0xc0
Dec 29 15:37:24 PC040 kernel: [21333.008126] [] ? dev_watchdog+0x1fe/0x210
Dec 29 15:37:24 PC040 kernel: [21333.008129] [] ? dev_watchdog+0x1fe/0x210
Dec 29 15:37:24 PC040 kernel: [21333.008133] [] warn_slowpath_fmt+0x33/0x40
Dec 29 15:37:24 PC040 kernel: [21333.008136] [] dev_watchdog+0x1fe/0x210
Dec 29 15:37:24 PC040 kernel: [21333.008143] [] call_timer_fn+0x30/0xf0
Dec 29 15:37:24 PC040 kernel: [21333.008148] [] ? __wake_up+0x3f/0x50
Dec 29 15:37:24 PC040 kernel: [21333.008151] [] ? dev_graft_qdisc+0x70/0x70
Dec 29 15:37:24 PC040 kernel: [21333.008155] [] run_timer_softirq+0x18c/0x2b0
Dec 29 15:37:24 PC040 kernel: [21333.008158] [] ? dev_graft_qdisc+0x70/0x70
Dec 29 15:37:24 PC040 kernel: [21333.008162] [] __do_softirq+0xec/0x230
Dec 29 15:37:24 PC040 kernel: [21333.008166] [] ? cpu_callback+0x170/0x170
Dec 29 15:37:24 PC040 kernel: [21333.008171] [] do_softirq_own_stack+0x26/0x30
Dec 29 15:37:24 PC040 kernel: [21333.008173] [] irq_exit+0x95/0xa0
Dec 29 15:37:24 PC040 kernel: [21333.008180] [] smp_apic_timer_interrupt+0x38/0x50
Dec 29 15:37:24 PC040 kernel: [21333.008183] [] apic_timer_interrupt+0x34/0x3c
Dec 29 15:37:24 PC040 kernel: [21333.008186] ---[ end trace b31c809dae7ef8dc ]--- Dec 29 15:37:24 PC040 kernel: [21333.008193] forcedeth 0000:00:07.0 eth1: Got tx_timeout. irq status: 00000020
Dec 29 15:39:01 PC040 CRON[3351]: (root) CMD ( [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean) Dec 29 15:39:01 PC040 CRON[3350]: (CRON) info (No MTA installed, discarding output)
Dec 29 15:49:03 PC040 systemd[1]: Created slice user-1000.slice.
Dec 29 15:49:03 PC040 systemd[1]: Starting user-1000.slice.
Dec 29 15:49:03 PC040 systemd[1]: Starting User Manager for UID 1000...
Dec 29 15:49:03 PC040 systemd[1]: Started Session 19 of user PC040.
Dec 29 15:49:03 PC040 systemd[1]: Starting Session 19 of user PC040.
Dec 29 15:49:03 PC040 systemd[3477]: Reached target Timers.
Dec 29 15:49:03 PC040 systemd[3477]: Starting Timers.
Dec 29 15:49:03 PC040 systemd[3477]: Reached target Sockets.
Dec 29 15:49:03 PC040 systemd[3477]: Starting Sockets.
Dec 29 15:49:03 PC040 systemd[3477]: Reached target Paths.
Dec 29 15:49:03 PC040 systemd[3477]: Starting Paths.
Dec 29 15:49:03 PC040 systemd[3477]: Reached target Basic System.
Dec 29 15:49:03 PC040 systemd[3477]: Starting Basic System.
Dec 29 15:49:03 PC040 systemd[3477]: Reached target Default.
Dec 29 15:49:03 PC040 systemd[3477]: Startup finished in 117ms.
Dec 29 15:49:03 PC040 systemd[1]: Started User Manager for UID 1000.
Dec 29 15:49:03 PC040 systemd[3477]: Starting Default.
Dec 29 15:49:04 PC040 dbus[583]: [system] Activating via systemd: service name='org.freedesktop.ConsoleKit' unit='console-kit-daemon.service'
Dec 29 15:49:04 PC040 systemd[1]: Starting Console Manager...
Dec 29 15:49:04 PC040 console-kit-daemon[3558]: missing action
Dec 29 15:49:04 PC040 dbus[583]: [system] Successfully activated service 'org.freedesktop.ConsoleKit'
Dec 29 15:49:04 PC040 systemd[1]: Started Console Manager. && run-parts --report /etc/cron.hourly)