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Mark Knecht wrote: |
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> Hi, |
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> For the first time in a couple of years I had a total hard hang |
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> today when a Virtualbox VM was doing some updates to M$ Office. The |
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> compute server was completely alive& then completely hung. The mouse |
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> wouldn't move, I couldn't switch to the console and I couldn't log in |
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> from another machine. I tried Alt-Ctrl-SysRq REISUB but there was no |
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> response to that either so I went with a hard reset and did some |
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> fsck's to ensure everything was OK. (It was...) After bringing the |
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> machine back up I tested that the Magic SysRq worked, and it did, so |
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> the hang was hard enough to stop even that. |
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> |
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> My question about this is what's your guess about where the hang |
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> occurred? Was it purely in the kernel and I just hit some corner |
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> condition that caused it? Or could it be that a hang in the VM could |
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> completely bring the machine to a halt such that the kernel never |
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> gains control even after waiting 15 minutes? |
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> |
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> The kernel was gentoo-sources-3.0.4, not the -r1 that came out today. |
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> |
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> Looking forward to all ideas. |
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> |
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> Cheers, |
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> Mark |
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> |
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> |
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|
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Well, I had a weird one a while back that caused this sort of issue. It |
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turned out that one of my hard drives was having a file system issue. I |
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put a new file system on it, it works fine ever since. Weird but real. |
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|
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That said, if the kernel itself locks up, the SysReq keys may not work. |
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I have found that if you can't ssh in or get the SysReq keys to work, it |
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is what I call a hard lock up. Hitting the reset button or pulling the |
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plug is the only option I know of. |
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|
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You can set it so that it will reboot automatically when it locks up. |
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Thing is, if the lock up is severe enough, that may not work either. |
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Same as the SysReq keys I guess. |
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|
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Having the option to use SysReq keys are nice but sometimes even that |
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doesn't work. It would be nice if one could cross their fingers when |
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using those. I have to use both hands to press mine. Does crossing |
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toes help? lol |
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|
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Dale |
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|
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:-) :-) |
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