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From "MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1)" <mad...@hp.com>
Subject RE: apache 2.0.46 : segmentation fault or hangs system
Date Mon, 30 Jun 2003 15:38:32 GMT
Hi Peter,
	When you do a tusc, do you see the process looping on 'sendfile' ?.
If 'yes', I believe it's a transport layer bug (and we need some system
information), and I've been trying to duplicate it for the last couple of
months, without any success. It'll be nice if I can get access to the system
when the bug is showing up (I know it's a long shot). But, if that's not
possible, here are a couple of things that you might want to try :

1. Update to the latest ARPA and transport patches on your system
2. Use 'EnableSendFile off' in httpd.conf

Thanks
-Madhu

-----Original Message-----
From: Peter Van Biesen [mailto:peter.vanbiesen@vlafo.be]
Sent: Monday, June 30, 2003 2:19 AM
To: dev@httpd.apache.org; modproxy-dev@apache.org
Subject: apache 2.0.46 : segmentation fault or hangs system


Hi,

a couple of weeks ago I upgraded our servers from 2.0.43 to 2.0.46. 
Since then, child processes on our internal server either exit with a 
segmentation fault or keep running but take all CPU power. Hanging 
processes occur at a rate of about 5 per hour. As far as I can see the 
URLs they are serving are not special and work fine with other child 
processes - however, they are all proxy requests.

We are using two apache 2.0.46 is a proxy chain, the internal webserver 
hands all requests to the external apache 2.0.46. The external apache 
does not have that problem, however, when an error occurs connecting to 
a remote site or when an invalid status line is received, I noticed it 
does not exit cleanly and an 'invalid status line' error is received 
also by the internal server.

I tried to SIGQUIT a hanging childprocess to get a core but it does not 
respond ... Is there a way to make a child process core ( I didn't find 
a core anywhere ) when receiving a segmentation fault ?

The systems are HPUX 11.0 .

Thanks in advance !

Peter.

-- 
Peter Van Biesen
Adj. Sysadmin V.F.S.I.P.H.

tel: +32 (0) 2 225 85 70
fax: +32 (0) 2 225 85 88
e-mail: peter.vanbiesen@vlafo.be


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