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LINUX-L  2007

LINUX-L 2007

Subject:

Re: http won't run because of pdflush

From:

James Oulman <[log in to unmask]>

Reply-To:

Platform Independent Linux List! <[log in to unmask]>

Date:

Wed, 30 May 2007 17:06:25 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (45 lines)

Jeff Lasman wrote:
> It's taken about a week to figure out a weird problem with apache2.
>
> The server is a webhosting server run by a control panel, and apache
> gets restarted from time to time as users make changes to domain setups
> (beyond our control).
>
> Whitebox 3.0
> Kernel 2.4.21-15
>
> But apache is installed from source, not from RPMs.
>
> Almost once daily it refuses to restart.
>
> When I try to restart it from the command prompt the restart goes into a
> loop; I finally found this (from another shell) will stop it:
>
> # service httpd restart
>
> The above stops both services so they stop calling each other, and the
> loop stops. Then I looked through the output of the looping commands
> and found that http couldn't listen on port 443 because the kernel
> process pdflush was holding port 443.
>
> The process appeared in the output of ps waux as [pdflush]. I thought
> that meant it was defunct. True?
>
> Anyway, I did a kill -9 on the pid, and it disappeared from my ps waux
> output. Then apache2 restarted normally.
>
> Any idea as to how I might stop this from occurring again?
>
> I've never had this on any of our many servers running apache1, and this
> is the only apache2 server we run.
>

Processes surrounded by []'s are kernel threads.

Have you tried doing an apachectl graceful rather than a restart? That
should be sufficient for most configuration changes and isn't as
disruptive to the other threads doing work.

What version of apache is this?

-James

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