Hello Martinn,
On Fri, Aug 04, 2006 at 10:41:32AM -0400, Martin Cracauer wrote:
> I am new to the list, I'm sorry if this has been reported.
>
Welcome to perfmon.
> I get hangs on an amd64 SMP machine, the console prints message about
> recursive locking and the machine never recovers. I looked for
> existing bugs but it seems your bug database on sourceforge is empty.
>
It would help if you could post the kernel message about the locking problem.
> I am using libpfm-3.2-060621.tar.gz pfmon-3.2-060621.tar.gz
> perfmon-new-base-060621.tar.gz on linux-2.6.17.7.tar.bz2 (kernel.org).
>
Yes, that's the latest.
> I get the hangs when remote attaching to the same process from a
> script several times. It hangs after about 4-10 such attempts, and
I assume, you mean attach/detach multiple times.
> did so three times in a row. The process is a big (about 3 GB VM) 32
> bit process on FC3/amd64, perfmon2 is compiled as 64 bits. It works
> fine as far as it goes but then locks up the kernel.
>
> Recompiling the kernel without SMP got me the statistics I want
> without problems.
>
> Hardware: 2x Opteron 250 in Tyan Thunder K8W.
>
> Has this been reported before?
>
No.
Please provide some trace or kernel call stack dump.
One thing you can do is to enable perfmon debugging and send me the output.
To enable debugging:
# echo 1 >/sys/kernel/perfmon/debug
To avoid printk() problems, I advise you stop syslogd/klogd. Then grab the
output
via dmesg.
Thanks.
--
-Stephane
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