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- Subject: Re: Segfault
- From: William Ahern <william@...>
- Date: Sun, 8 Sep 2013 14:18:06 -0700
On Sun, Sep 08, 2013 at 10:24:12PM +0200, Chris Datfung wrote:
> On Sun, Sep 8, 2013 at 5:20 PM, Chris Datfung <email@example.com>wrote:
> > On Tue, Sep 3, 2013 at 9:33 PM, William Ahern <firstname.lastname@example.org>wrote:
> >> # service=0xfffffffd <Address 0xfffffffd out of bounds>, port=62352) at
> >> # tcp_unix.c:166
> >> A little Googling suggests that _this_ tcp_open call comes from c-client,
> >> the UW-IMAP library. Perhaps the issue is as kamicc olo suggested.
> Just to close the loop on this. The issue occurred on a CentOS server
> running cPanel and EasyApache. I rebuilt PHP without IMAP support which
> solved the problem. I'm still curious what led you to know that this was
> related to IMAP under PHP.
The backtrace you posted on pastebin.com didn't match the code in luasocket.
So I Google'd tcp_open with some other routines in that backtrace triggered
by tcp_open and got hits for c-client. I downloaded the c-client code and
compared the call chain, and it was a match.
I noticed in the backtrace the entry points for Apache--ap_* and
modsecurity_*. It was just an educated guess that it was PHP; it's widely
used and often installed by default.