Re: segfault at 0 ... error 4 in curl-loader

[Robert I. <cor...@gm...>]

Hi bnoble,

On Tue, Dec 1, 2009 at 10:42 PM, bnoble <bn...@gm...> wrote:

> Hello,
>
> I receive the following error when attempting to run the 10k
> configuration example, or any configuration which exceeds 1500-3000
> CLIENTS_NUM_MAX:
>
> curl-loader[3975]: segfault at 0 ip 0000000000440094 sp
> 00007f96b17c2bc0 error 4 in curl-loader[400000+8a000]
>
> Sometimes it crashes immediately, sometimes it runs until ~3000
> clients are loaded.  I have played with every conceivable sysctl
> parameter with no luck.  I have tried running the application with
> four threads, I have adhered to every recommendation I could find.  Am
> I missing something obvious?  I encountered similar problems with an
> old Ubuntu VM previously; this, however, is not a VM instance.
>
> OS: OpenSuSE 11.1
> Linux 2.6.27.37-0.1-default #1 SMP 2009-10-15 14:56:58 +0200 x86_64
> x86_64 x86_64 GNU/Linux
> Quad-core 2Ghz Xeon (Tylersburg) 4M cache with 8GB RAM
>
> Thanks.
>


Are you sure, that your sockets/open descriptors limit is sufficient?


Please:

1. Compile it with debugging information
$make clean; make debug=1 optimize=0

2. keep core allowed in your shell
#ulimit -c unlimited

3. Run it till crash and get the core file

4. open the core and the curl-loader application by gdb debugger
   and explore the backtrace by bt command

You might wish to send the trace to this list.


-- 
Truly,
Robert Iakobashvili, Ph.D.
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