still have a mysterious crash

jhanna has asked for the wisdom of the Perl Monks concerning the following question:

This is a follow up to node Mysterious script crash in win2k

sub mlog {
 my $fh=shift;
 d(34);
 my $m=localtime();
 $m=~s/^... (...) +(\d+) (\S+) ..(..)/$1-$2-$4 $3/;
 $m.= " $Con{$fh}->{ip} <$Con{$fh}->{mailfrom}>" if $fh && $Con{$fh};
 $m.= " $_[0]\n";
 print $m unless $silent;
 print DEBUG  $m;
 if($logfile && open(LOG,">>$logfile")) {print LOG $m; close LOG;}
}
[download]

I localized the last crash to this subroutine. d(34) printed 34 in the debug file, but the $m never appeared on the console, nor in the DEBUG log file (which is unbuffered), neither in the LOG file.

This means the program crashed inside localtime(), or doing a s/// regexp replace, or concatenating to a string ($m). The $_[0] parameter that was passed in was a string constant: 'local or whitelisted', and was called this way:

  if(onwhitelist($fh,$this->{header})) {
   setmaillog(0,$fh);
   isnotspam($fh);
   mlog($fh,'local or whitelisted');
  }
[download]

The setmaillog and isnotspam functions operated correctly and also affirm that $this is not corrupted.

Help! Something I'm doing is corrupting perl internally, and I don't know how to find that kind of bug!

john

P.S. Here's my perl's version:

This is perl, v5.6.1 built for MSWin32-x86-multi-thread
(with 1 registered patch, see perl -V for more detail)

Copyright 1987-2001, Larry Wall

Binary build 630 provided by ActiveState Tool Corp. http://www.ActiveState.com
Built 20:29:41 Oct 31 2001

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Re: still have a mysterious crash by Thelonius (Priest) on Dec 17, 2002 at 19:07 UTC
I localized the last crash to this subroutine. d(34) printed 34 in the debug file, but the $m never appeared on the console, nor in the DEBUG log file (which is unbuffered), neither in the LOG file. This means the program crashed inside localtime(), or doing a s/// regexp replace, or concatenating to a string ($m). The $_[0] parameter that was passed in was a string constant: 'local or whitelisted', and was called this way: And you stopped localizing the error because ...? `print DEBUG "Line ", __LINE__, "\n";` before each line at the very least. You can also `print DEBUG "\$fh = $fh\n"; print DEBUG "\$Con{\$fh} = $Con{$fh}\n"; print DEBUG "\$Con{\$fh}->{ip} = $Con{$fh}->{ip}\n"; print DEBUG "\$Con{\$fh}->{mailfrom} = $Con{$fh}->{mailfrom}\n";` [download]	[reply] [d/l] [select]
Re: Re: still have a mysterious crash by jhanna (Scribe) on Dec 17, 2002 at 19:17 UTC
And I stopped localizing because the thing takes 2 - 14 hours to crash (unpredictably). I put in more d() lines, but have to wait for it to crash again before I can get closer. Besides, if it's a perl internal problem it'll pick another random place to die next time. j	[reply]
Re: still have a mysterious crash by dingus (Friar) on Dec 17, 2002 at 19:08 UTC
This is probably not the solution. But it will change the localtime line and remove the s/// one. I don't say its better but it might throw some light on what's happening. `my ($sec,$min,$hour,$mday,$mon,$year) = localtime(); my $m = ('Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct', +'Nov','Dec')[$mon]. "-$mday-".substr($year,-2).sprintf(' %02d:%02d:%02d', $hour,$min,$s +ec); $m.= " $Con{$fh}->{ip} <$Con{$fh}->{mailfrom}>" if $fh && $Con{$fh}; $m.= " $_[0]\n"; print $m unless $silent; print DEBUG $m;` [download] Yes it is a strike at semi-random. What I guess may happen is that the problem now moves to a completely differet place. If so I suspect you may be looking at a weird memory leak kind of error. However I did get a very very weird crash the first time I ran your 2 lines in a CGI script - it broke the webserver! Needless to say this hasn't happened since. Dingus `Enter any 47-digit prime number to continue.`	[reply] [d/l]
Re: Re: still have a mysterious crash by jhanna (Scribe) on Dec 17, 2002 at 19:20 UTC
I thought about messing with that line as well, but it baffles me why it would work 99.99% of the time and then fail. Curious that it broke your server. Maybe I'm not insane! j	[reply]


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