Estou usando o Ubuntu em um Thinkpad T450s há algum tempo.
De vez em quando, o sistema vai travar em mim. Por exemplo. o mouse não se move, o ctrl-alt-f # não me leva a um terminal simples, etc.
Eu ainda não experimentei a chave mágica do sysreq, e vou da próxima vez, mas não sou otimista.
Aqui está um recorte do journalctl daquele tempo (eu ativei o log persistente para que eu possa solucionar esse problema):
Jul 07 16:53:27 gothputer systemd[1]: Starting Cleanup of Temporary Directories...
Jul 07 16:53:27 gothputer systemd-tmpfiles[5215]: [/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
Jul 07 16:53:27 gothputer systemd[1]: Started Cleanup of Temporary Directories.
Jul 07 16:55:13 gothputer kernel: perf interrupt took too long (5045 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
Jul 07 16:57:59 gothputer systemd-timesyncd[786]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com).
Jul 07 16:57:59 gothputer systemd-timesyncd[786]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
Jul 07 17:12:40 gothputer kernel: thinkpad_acpi: EC reports that Thermal Table has changed
Jul 07 17:17:01 gothputer CRON[6044]: pam_unix(cron:session): session opened for user root by (uid=0)
Jul 07 17:17:01 gothputer CRON[6045]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Jul 07 17:17:01 gothputer CRON[6044]: pam_unix(cron:session): session closed for user root
Jul 07 17:25:13 gothputer wpa_supplicant[1206]: wlp3s0: WPA: Group rekeying completed with e0:3f:49:e2:3f:c4 [GTK=CCMP]
Jul 07 17:41:35 gothputer sudo[7819]: pam_ecryptfs: pam_sm_authenticate: /home/zee is already mounted
Jul 07 17:41:35 gothputer sudo[7819]: zee : TTY=pts/1 ; PWD=/home/zee/Downloads ; USER=root ; COMMAND=/usr/bin/gdebi N1.deb
Jul 07 17:41:35 gothputer sudo[7819]: pam_unix(sudo:session): session opened for user root by zee(uid=0)
Jul 07 17:41:43 gothputer sudo[7819]: pam_unix(sudo:session): session closed for user root
-- Reboot --
Jul 07 17:48:21 gothputer systemd-journald[313]: Runtime journal (/run/log/journal/) is 8.0M, max 118.9M, 110.9M free.
Jul 07 17:48:21 gothputer kernel: Initializing cgroup subsys cpuset
Jul 07 17:48:21 gothputer kernel: Initializing cgroup subsys cpu
Jul 07 17:48:21 gothputer kernel: Initializing cgroup subsys cpuacct
Jul 07 17:48:21 gothputer kernel: Linux version 4.4.0-28-generic (buildd@lcy01-13) (gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) ) #47-Ubuntu SMP Fri Jun 24 10:09:13 UTC 2016 (Ubuntu
Jul 07 17:48:21 gothputer kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic.efi.signed root=UUID=3862c22d-6f33-42a1-8bde-d05dc9f1af16 ro quiet splash vt.handoff=7
Jul 07 17:48:21 gothputer kernel: KERNEL supported cpus:
Jul 07 17:48:21 gothputer kernel: Intel GenuineIntel
Jul 07 17:48:21 gothputer kernel: AMD AuthenticAMD
Jul 07 17:48:21 gothputer kernel: Centaur CentaurHauls
Jul 07 17:48:21 gothputer kernel: x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
Jul 07 17:48:21 gothputer kernel: x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point registers'
Jul 07 17:48:21 gothputer kernel: x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers'
Jul 07 17:48:21 gothputer kernel: x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers'
Jul 07 17:48:21 gothputer kernel: x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
Durante esse bloqueio específico, o relógio na minha área de trabalho congelou às 17:47:40, para referência.
Quais são os próximos passos aqui? Eu não tenho certeza de onde começar a ler cada log que eu possa encontrar, já que não está muito claro "o que" está falhando.