Ubuntu開機卡在init-bottom ... done.

Ubuntu 12.04雖然有正常使用shutdown指令關機，且關機前也有用sync;sync;sync把資料都寫入到硬碟上面 force competion of pending disk writes (flush cache)。但開機到下面後就卡住了：

• Begin: Running /scripts/init-premount ... done.
• Begin: Mounting root file system ... 
• Begin: Running /scripts/local-top ... done.
• Begin: Running /scripts/local-premount ... done.
• [10.367590] EXT4-fs (md1): mounted filesystem with ordered data mode. Opts: (null)
• Begin: Running /scripts/local-bottom ... done.
• done.
• Begin: Running /scripts/init-bottom ... done.

用最後一行當關鍵字搜尋，加上Ubuntu 12.04這個關聯性找到這個連結，看到下一行是：

• fsck from util-linux 2.20.1
• /dev/sda1: clean, ......

猜測應該是檔案系統出問題在修理，但因為磁區很大，故就卡在那邊沒有訊息。後來在卡住的時候先按Ctrl-c終止這個階段的檢查，終於進到系統以後，觀察 /var/log/boot.log：

• A4V3 contains a file system with errors, check forced.
• User cancelled filesystem checks
• A4V3: e2fsck canceled.
• A4V3: ********** WARNING: Filesystem still has errors **********
• mountall: fsck /a4/v3 [625] terminated with status 36
• mountall: Filesystem has errors: /a4/v3
• Ignoring errors with /a4/v3 at user request
• ......

使用下面的指令修理有問題的檔案系統：

• fsck -y /a4/v3

參考資料

• Is there a solution for when a system hangs on “switching to clocksource tsc” anyway?：這邊可以看到init-bottom後面的下一行，而且系統是Ubuntu Server 12.04

_EOF_