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Date: Fri, 14 Jan 2005 12:48:12 -0300
From: "Ivan Barrera A." <Bruce@Ivn.cl>
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Subject: Re: [users@httpd] Weird Apache Memory Leak or something

Sorry, but i just need to ask..
where do i get "truss" ?

Preston Podaril wrote:
> We have been having some weird issues with Apache for several months 
> now.  I have been trying to dig out the reason for it with truss and 
> lsof, but I have been unable to catch anything abnormal.
> 
> We are running Solaris 8.  We upgraded to Apache (mod_ssl) 1.3.33 and 
> PHP 4.3.10 a week and a half ago.  Before that we were running Apache 
> (mod_ssl) 1.3.29 and PHP 4.3.4.  In both scenarios this problem is 
> occurring.
> 
> Our problem is that the libhttpd.ep processes appear to be leaking 
> memory for some reason.  They also will go to sleep indefinitely (as 
> seen in a truss).  The processes that are problematic will grow up to 
> 80M in RES size, checking out a truss on them, doesn't seem to show 
> anything abnormal, nothing that would denote its size getting so large. 
>  When we get a lot of these processes between 50M and 80M the machines 
> RAM and swap will get filled up, and then it will become fairly 
> unusable.  I have left a truss go overnight on one of these processes 
> that is "dead" and this is all it would show, over and over again in 
> thet output of the truss.
> 
> sigsuspend(0xFFBDDE68)      (sleeping...)
> signotifywait()         (sleeping...)
> lwp_sema_wait(0xFDF0DE30)   (sleeping...)
> signotifywait()                 = 16
> lwp_sigredirect(0, SIGUSR1, 0x00000000)     = 0
> sigsuspend(0xFFBDDE68)      (sleeping...)
> signotifywait()         (sleeping...)
> lwp_sema_wait(0xFDF0DE30)   (sleeping...)
> signotifywait()                 = 16
> lwp_sigredirect(0, SIGUSR1, 0x00000000)     = 0
> 
> It has proven really hard to determine what is causing the problem here. 
>       MaxClients are set at 70 and 90 for the two different sized 
> machines in the cluster.  I have messed with the MaxRequestsPerChild and 
> MaxKeepAliveRequests with no avail, both are set at 1000 currently.
> 
> Does anyone have any ideas on what might be causing this?  or any other 
> testing utilities I can use to help track down the problem?  I believe 
> it to be something with php or something php is using, although I have 
> nothing to show me that yet.
> 
> Thanks for any ideas!

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