Boot freeze in NO_HZ [LWN.net]

Boot freeze in NO_HZ

Posted Dec 20, 2007 5:22 UTC (Thu) by ncm (subscriber, #165)
Parent article: Kernel release status

On my Dell Latitude D620, with an Intel Core2 Duo dual-CPU, recent kernels (2.6.22.9, 2.6.23.10) hang during boot unless I add "nohz=off" to the boot line. (I built with CONFIG_NO_HZ and CONFIG_HIGH_RES_TIMERS on.) They stall after displaying

...
i2c-adapter i2c-3: unable to read EDID block
Switched to high resolution mode on CPU 1
Switched to high resolution mode on CPU 0

and (apparently) before

IP route cache hash table entries 32768 (order: 5, 131072 bytes)

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Boot freeze in NO_HZ

Posted Dec 20, 2007 16:03 UTC (Thu) by mingo (subscriber, #31122) [Link]

please report this in bugzilla.kernel.org. (or if you have already, what is the bug#?)

Boot freeze in NO_HZ

Posted Dec 21, 2007 3:56 UTC (Fri) by ncm (subscriber, #165) [Link]

9612.

Oddly, the problem seems to have healed overnight, which is also worrisome. I have had this failure before, but attributed it to a corrupt tuxonice image; it always booted ok shortly afterward with "noresume". This time it was booting cold, and the failure was entirely repeatable (for a while, evidently).