intermittent segfaults, ssl?
Hi, I have a server like this: Server Version: Apache/2.2.9 (Debian) mod_ssl/2.2.9 OpenSSL/0.9.8g mod_apreq2-20051231/2.6.0 mod_perl/2.0.4 Perl/v5.10.0 I'm also using HTML::Mason I've been getting intermittent segfaults like this: child pid 10142 exit signal Segmentation fault (11) ever since in installed Apache2 in March. I am going to try to debug this, but I thought I would ask if anyone might have a suggestion based on this behavior: - no segfaults occur with 8 hours of an apache restart; the first fault can be 8 to 48 hours after restart, the 2nd may occur within seconds; there have never been more than 5 in a day. - I have observed these faults *only* for port 443 (ssl) requests. - The simplest case has been when a plain HTML page was served through mod_perl and mason; e.g. no database call. I know probably shouldn't be imposing on list-readers time without doing more work, but I just wonder is it isn't something really elementary that I'm missing. Mark
Re: intermittent segfaults, ssl?
We had a very similar problem. After a lot of effort trying to track down the source, we believe we isolated it to a line of perl code that incorrectly sets $/ without localizing it. mod_backtrace showed that the problem seemed to be happening in modperl_perl_global_request_save Here is the thread that suggested the fix that worked for us: http://www.gossamer-threads.com/lists/modperl/modperl/100066 Here is the thread we posted, not actually any more informative: http://www.gossamer-threads.com/lists/modperl/modperl/100842 The proof is in the pudding. After fixing the line with $/, we went from dozens of seg faults per hour to none. - Alex Aminoff BaseSpace.net National Bureau of Economic Research (nber.org) On Tue, 12 Jan 2010, Mark Copper wrote: Hi, I have a server like this: Server Version: Apache/2.2.9 (Debian) mod_ssl/2.2.9 OpenSSL/0.9.8g mod_apreq2-20051231/2.6.0 mod_perl/2.0.4 Perl/v5.10.0 I'm also using HTML::Mason I've been getting intermittent segfaults like this: child pid 10142 exit signal Segmentation fault (11) ever since in installed Apache2 in March. I am going to try to debug this, but I thought I would ask if anyone might have a suggestion based on this behavior: - no segfaults occur with 8 hours of an apache restart; the first fault can be 8 to 48 hours after restart, the 2nd may occur within seconds; there have never been more than 5 in a day. - I have observed these faults *only* for port 443 (ssl) requests. - The simplest case has been when a plain HTML page was served through mod_perl and mason; e.g. no database call. I know probably shouldn't be imposing on list-readers time without doing more work, but I just wonder is it isn't something really elementary that I'm missing. Mark
Re: intermittent segfaults, ssl?
Despite what I said, this seems to be CPAN bug 37027 or, in my case, Debian bug #520406 involving module DBD-mysql. Mark On Tue, Jan 12, 2010 at 12:24:17PM -0600, Mark Copper wrote: > Hi, > > I have a server like this: > Server Version: Apache/2.2.9 (Debian) mod_ssl/2.2.9 OpenSSL/0.9.8g > mod_apreq2-20051231/2.6.0 mod_perl/2.0.4 Perl/v5.10.0 > I'm also using HTML::Mason > > I've been getting intermittent segfaults like this: > child pid 10142 exit signal Segmentation fault (11) > ever since in installed Apache2 in March. > > I am going to try to debug this, but I thought I would ask if anyone > might have a suggestion based on this behavior: > - no segfaults occur with 8 hours of an apache restart; the first fault > can be 8 to 48 hours after restart, the 2nd may occur within seconds; > there have never been more than 5 in a day. > > - I have observed these faults *only* for port 443 (ssl) requests. > > - The simplest case has been when a plain HTML page was served through > mod_perl and mason; e.g. no database call. > > I know probably shouldn't be imposing on list-readers time without doing > more work, but I just wonder is it isn't something really elementary > that I'm missing. > > Mark
