David,
Could you try recompiling your kernel without preemption turned on?
On Sun, Nov 8, 2009 at 12:09 AM, David Nellans <dnell...@cs.utah.edu> wrote:
> I've been able to replicate what seems to be a race condition based bug.
> I can run many traces without a crash, and sometimes it will crash on the
> first attempt.
>
> I've attached a log of the dmesg output of what is happening. Please let
> me know if there is anything else I can provide that might help diagnose.
>
> ----------------------------------------
> From: *Manu Awasthi* <manu.awas...@gmail.com>
> Date: Tue, Nov 3, 2009 at 10:31 AM
> Subject: kernel panic with monitoring DRAM events
> To: perfmon2-devel@lists.sourceforge.net
>
>
> Hi all,
> I have been measuring memory events for the parsec benchmark suite on a
> dual socket, quad-core opteron machine with pfmlib version 3.9, kernel pfmon
> version 2.82 and kernel version 2.6.29.6 . This is what I use as my
> commandline option:
>
> >> pfmon --with-header --outfile=test1 --verbose -u --switch-timeout=100
> -eDRAM_ACCESSES_PAGE:HIT,DRAM_ACCESSES_PAGE:MISS,DRAM_ACCESSES_PAGE:CONFLICT,DRAM_ACCESSES_PAGE:ALL
> -eDRAM_ACCESSES_PAGE:DCT1_PAGE_HIT,DRAM_ACCESSES_PAGE:DCT1_PAGE_MISS,DRAM_ACCESSES_PAGE:DCT1_PAGE_CONFLICT,DRAM_ACCESSES_PAGE:ALL
> $PASEC_COMMAND
>
> The problem is, sometimes, over different runs of the same (multi-threaded)
> benchmark, the kernel panics and the machine freezes up. has anybody ever
> experienced something of this sort before? Or is there something that I am
> doing wrong? Is there a better way to measure these stats (system-wide
> monitoring?)?
>
> Any help is appreciated.
>
> Thanks,
> Manu
>
>
> -----------------------------
> David W Nellans
> dnell...@cs.utah.edu
>
>
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