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From Joshua Slive <jos...@slive.ca>
Subject Re: mod_mbox spinning processes on ajax
Date Mon, 17 Oct 2005 14:45:16 GMT


Maxime Petazzoni wrote:
> Salut,
> 
> * Joshua Slive <joshua@slive.ca> [2005-10-16 15:54:18]:
> 
>> There appear to be some httpd processes spinning on cpu on ajax. 
>> Attaching with gdb and asking for a backtrace gives me something
>> like this:
> 
> [snip]
> 
> Could you send us the URL that raised the problem ? We don't see
> anything that could be wrong in the mbox_wrap_text code :(

This URL seems to give the problem:
http://mail-archives.apache.org/mod_mbox/xmlgraphics-fop-commits/200012.mbox/%3c20001212191857.95050.qmail@locus.apache.org%3e

There are no spinning httpds on ajax at the moment -- they seem to come 
and go.  I suspect that they are not permanently spinning, but rather 
are dying whenever the client gives up on waiting.  Connecting to the 
above URL gives me instant 100% CPU usage on the server that lasts until 
I hit "stop" on the browser.  I get no content from the server.

I would debug further, but that would involve actually looking at the 
code, which I have so far managed to avoid ;-)

I forced a core dump and put it in /raid1/httpd-cores/core.31834 on ajax.

Here's the basics:
#1  0x2000000001007f30 in mbox_wrap_text (
     str=0x200000000147c038 "fotis       00/12/12 11:18:52\n\n 
Modified:    .        build.xml\n", ' ' <repeats 15 times>, 
"docs/examples build.xml\n", ' ' <repeats 15 times>, "docs/xml-docs 
fop.xml xml2xml.xsl\n", ' ' <repeats 15 times>, "lib      Fop.class 
Fop.java read"...) at mod_mbox.c:155
#2  0x2000000001012ff0 in mbox_static_message (r=0x6000000000230ca0,
     f=0x6000000000235f70) at mod_mbox_out.c:1158
#3  0x200000000100a900 in mbox_file_handler (r=0x6000000000230ca0)
     at mod_mbox_file.c:320
#4  0x4000000000035f90 in ap_run_handler (r=0x6000000000230ca0) at 
config.c:153
#5  0x4000000000036f70 in ap_invoke_handler (r=0x6000000000230ca0)


Joshua.

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