My ubuntu box is frozen and there is nothing I can do (i.e. the keyboard is not
working).
Why the kernel is not killing or pausing the processe(s) that are draining the
resources? On my Mac it always stops them and ask to kill it or keep running.
This is the last time I'm using linux(as my main/personal computer). It's just
not for personal use. It's just mean to run it for internet services running in
high availability configurations that can be restarted/trashed.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/159356
Title:
System freeze on high memory usage
Status in linux package in Ubuntu:
Confirmed
Bug description:
I run a batch matlab job server here at my lab, running Dapper 6.06 (for the
LTS). One of the users has submitted a very memory-consuming job, which
successfully crashes the server. Upon closer inspection, the crash happens like
this:
1. I run matlab with the given file (as an ordinary, unpriveleged user)
2. RAM usage quickly fills up
3. Once the RAM meter hits 100%, the system freezes: All SSH connections
freeze up, and while switching VTs directly on the machine works, no new
processes run - so one can't log in, or do anything if he is logged in.
(Sometimes typing doesn't work at all)
Note that the swap - while 7 gigs of it are available - is never used.
(The machine has 7 gigs of RAM as well)
I've tried the same on my Gutsy 32-bit box, and there was no system
freezeup - matlab simply notified that the system was out of memory.
However, it did this once memory was 100% in use - and still, swap
didn't get used at all! (Though it is mounted correctly and shows up
in "top" and "free").
So first thing's first - I'd like to eliminate the crash issue. I
suppose I could switch the server to 32-bit, but I think that would be
a performance loss, considering that it does a lot of heavy
computation. There is no reason, however, that this should happen on a
64-bit machine anyway. Why does it?
WORKAROUND: Enabling DMA in the BIOS
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