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Re: Partial cores using Linux "pipe" core_pattern
On Mon, 2009-05-18 at 09:25 +0200, Andi Kleen wrote:
> Paul Smith <psmith@gnu.org> writes:
> >
> > Does anyone have any thoughts about where I can look next to try to
> > figure out what's going on? Ideas or knowledge about limitations of the
> > kernel's core_pattern pipe capability, such as timing issues etc., that
> > might be leaving me with short cores?
>
> Sounds more like a kernel problem to me. It would be good if you
> could find out in what way the cores are truncated, then do a proper
> kernel bug report.
>
> Or add printks to the kernel coredumper and try to figure out this
> way where/why it stops.
Heh, I was afraid you'd say that :-). OK, I'll dig into the kernel
coredumper and add some printks etc.
I do have problems getting a readily reproducible test case. It seems
timing related; I tried replacing my gzopen()/etc. calls with
uncompressed open()/etc. and that seemed to help; no more short cores.
And yet at other times I can dump the core through gzopen() no problem.
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