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how do I troubleshoot boot freezes?

asked 2017-11-13 21:59:46 +0000

toddandmargo gravatar image

Hi All,

I have two customers with Fedora servers. one is FC25 and one is FC26. Both get weird after a while and need to be rebooted (I think it may be bad power or memory leaks). On reboot, both machines freeze at the "f". (If not acting weird, they reboot fine). To reset the machine required the power cord be pulled.

And I really mean "freeze". None of the typical tricks work, such and "esc", ctrl-alt-f1, ctrl-alt-backspace, etc..

Is there some kind of log somewhere that will tell me what is happening?

Many thanks, -T

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answered 2017-11-13 22:25:04 +0000

florian gravatar image

updated 2017-11-13 22:26:49 +0000

When you manage to successfully boot to terminal, run journalctl -b-1 to see the log of the previous (-1) boot. You can replace -1 by any other number to see older boot logs.

You may want to check whether this is related to a newer kernel. Just boot an older kernel and check if the problem disappears. Start with the oldest kernel and try to figure out when the problem was introduced.

Also, run a memcheck on this machine - maybe your RAM is defective.

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Thank you!

Memory. Maybe. Both motherboard are C236 chipsets with ECC memory. Do yo know of a failure mechanism that ECC and C23e6 would not catch?

toddandmargo ( 2017-11-14 02:38:19 +0000 )edit

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Asked: 2017-11-13 21:59:46 +0000

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Last updated: Nov 13 '17