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Thread: corrupted low memory?

  1. #1
    Join Date
    Jul 2010
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    Long Island, NY
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    255
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    Ubuntu 10.04 Lucid Lynx

    corrupted low memory?

    So after installing the new kernel and thereby solving one problem, I've now got a new one.

    When I boot up I'm greeted with this message:

    Code:
    [    60.881427] Corrupted low memory at c000659c (659c phys) = 00001a00
    [    60.882418] Memory corruption dedected in low memory
    Is this just a bug in the kernel or is it something I need to be worried about (or both)?

  2. #2
    Join Date
    Mar 2010
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    Ubuntu 10.04 Lucid Lynx

    Re: corrupted low memory?

    Do you still have the Ubuntu CD?

    If yes, I would boot the computer with it and use Memtest to check your system.

    Let it run, it can take quite some time.

    If there are problems, they will be reported and you may have to replace your RAM.

    Hope this helps.

  3. #3
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    Re: corrupted low memory?

    I booted from a usb, but I believe I can do the memtest from the grub menu. I hope that's not the issue though, I just got this machine from HP a few days ago.

  4. #4
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    Re: corrupted low memory?

    You were right, I had to run the memtest from the liveUSB after all. When I tried using the grub menu it would only get through part of the test and then reboot. Hmm ...

    In any event, no errors were found, so it must be a kernel bug. This only started happening after I installed the new kernel.

    I'm going to try a fresh install of the 64-bit platform. Right now I'm running the i386 version on a 64-bit machine. That's not supposed to be a problem, but we'll see what happens.
    Last edited by Chris1274; August 21st, 2010 at 06:14 PM.

  5. #5
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    Re: corrupted low memory?

    Quote Originally Posted by Chris1274 View Post
    You were right, I had to run the memtest from the liveUSB after all. When I tried using the grub menu it would only get through part of the test and then reboot. Hmm ...

    In any event, no errors were found, so it must be a kernel bug. This only started happening after I installed the new kernel.

    I'm going to try a fresh install of the 64-bit platform. Right now I'm running the i386 version on a 64-bit machine. That's not supposed to be a problem, but we'll see what happens.
    A fresh install should hopefully fix any problems and 64-bit on 64-bit would seem to make sense.

    Good luck!


  6. #6
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    Re: corrupted low memory?

    So changing to the 64-bit platform didn't solve the issue. I still get the corrupted low memory message, and only after I installed the 2.6.34 kernel, so it's obviously a kernel bug. Oh well, it's not affecting any functionality as far as I can tell. The only annoyance is that the message pops up when I open a tty terminal. I can live with that.

  7. #7
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    Re: corrupted low memory?

    You might want to consider submitting a bug report on launchpad about this.

    In any event, I am pleased you got things working again (sort of).


  8. #8
    Join Date
    Jul 2008
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    Re: corrupted low memory?

    Can you please test and report if this works?

    memory_corruption_check_size=128K

    in the boot options.

    The default is

    memory_corruption_check_size=64K

    but it seems that's not enough for some systems.

    Thanks

    If you don't know how to set BootOptions read

    https://help.ubuntu.com/community/BootOptions

    Also this thread is very important to anyone looking at this bug

    http://linux.derkeiler.com/Mailing-L.../msg04621.html

  9. #9
    Join Date
    Mar 2008
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    Re: corrupted low memory?

    Quote Originally Posted by nutznboltz View Post
    Can you please test and report if this works?

    memory_corruption_check_size=128K
    I couldn't figure out where to add this option to add it to grub every time, so I added it manually. Unfortunately, even after a reboot, I still get the error.

    Dell/Alienware m17x, 8GB RAM, running latest 10.10 release (64-bit) and all available updates.

    I'd love to hear a solution for this, it really slows down my system.

  10. #10
    Join Date
    May 2007
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    92

    Re: corrupted low memory?

    I'm also struggeling to work out where to set this option on a Grub2 system.

    I had a look at the BootOptions wiki, and it seemed limited to Grub1.

    For Grub2, is it just a case of:

    Code:
    menuentry 'Ubuntu, with Linux 2.6.32-25-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	insmod ext2
    	set root='(hd3,5)'
    	search --no-floppy --fs-uuid --set cdde25d2-a4fa-48b6-b564-27377f1ee0ef
    	linux	/boot/vmlinuz-2.6.32-25-generic root=UUID=cdde25d2-a4fa-48b6-b564-27377f1ee0ef ro   quiet splash
    	initrd	/boot/initrd.img-2.6.32-25-generic
            memory_corruption_check_size=128K
    }
    Would that be correct?

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