>>643
ちなみに、今回の現象は yaourt -Syau コマンドによるアップデート直後の再起動後に起きました。
下記が /var/log/pacman.log の抜粋ですが、原因はありそうでしょうか。

[PACMAN] Running 'pacman --color auto -Sy'
[PACMAN] Synchronizing package lists
[PACMAN] Running 'pacman --color auto -S -u'
[PACMAN] starting full sysyem upgrade
[ALPM] running 'ghc-unregister.hook'...
[ALPM] transaction started
[ALPM] installed lash (0.6.0~rc2-11)
[ALPM] installed portaudio (190600_20161030-1)
[ALPM] upgraded fluidsynth (1.2.9-1 -> 1.1.10-1)
[ALPM] upgraded gegl02 (0.2.0-7 -> 0.2.0-8)
[ALPM] upgraded vulkan-icd-loader (1.0.68.0-1 -> 1.1.70.0-1)
[ALPM] upgraded ilmbase (2.2.0-2 -> 2.2.1-1)
[ALPM] upgraded openexr (2.2.0-3 -> 2.2.1-1)
[ALPM] upgraded gst-plugins-bad (1.12.4-4 -> 1.12.4-5)
[ALPM] upgraded haskell-attoparsec (0.13.2.2-10 -> 0.13.2.2-11)
・・・以下 haskell のライブラリがいくつか続く・・・
[ALPM] upgraded haskell-retry (0.7.6.1-5 -> 0.7.6.1-6)
[ALPM] upgraded libmagick (7.0.7.23-1 -> 7.0.7.25-1)
[ALPM] upgraded imagemagick (7.0.7.23-1 -> 7.0.7.25-1)
[ALPM] upgraded lib32-libdrm (2.4.90-3 -> 2.4.91-1)
[ALPM] upgraded lib32-libxcb (1.12-2 -> 1.13-1)
[ALPM] upgraded lib32-vulkan-icd-loader (1.0.68.0-1 -> 1.1.70.0-1)
[ALPM] upgraded stack (1.6.5-26 -> 1.6.5-27)
[ALPM] upgraded vulkan-headers (1:1.0.68-1 -> 1:1.1.70-1)
[ALPM] transaction completed
[ALPM] running 'detect-old-perl-modules.hook'...
[ALPM] running 'ghc-register.hook'...
[ALPM] running 'systemd-update.hook'...