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From Steve Hay <steve....@uk.radan.com>
Subject Debugging leaked scalars
Date Wed, 30 Mar 2005 11:18:48 GMT
Having another look at why perl/ithreads.t fails on Win32, now using 
Dave Mitchell's -DDEBUG_LEAKING_SCALARS improvement:

http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2005-03/msg00639.html

As before I find that "use warnings => 'FATAL';" in 
t/response/TestPerl/ithreads.pm causes the Apache.exe running the test 
to exit, and then all subsequent tests fails because there is no server 
running any more.  (I still haven't got round to making the test suite 
abort when this happens...)

Commenting-out that "use warnings => 'FATAL';" line allows the tests to 
proceed (and they are all successful, apart from t/error/runtime.t, 
reported separately).  So what was the warning that caused the exit?  If 
I add:

    close STDERR;
    open STDERR, '>C:\\Temp\\stderr.txt';

to the start of TestPerl::ithreads::handler() then I get the following 
output in C:\Temp\stderr.txt:

*** The following leak is expected (perl bug #34342) ***
Scalars leaked: 1
leaked: sv=0x182d3058 flags=0x084040004 refcnt=0, Perl interpreter: 
0x144bda38
    allocated at 
C:\apache2\source\mod_perl-2.0\Apache-Test\lib/Apache/Test.pm:237 by 
entersub (cloned)
leaked: sv=0x12fe43dc flags=0x0880003 refcnt=0, Perl interpreter: 0x144bda38
    allocated at -e:0 by (none) (cloned)

*** The following leak is expected (perl bug #34341) ***
Scalars leaked: 1
leaked: sv=0x140cf858 flags=0x084040004 refcnt=0, Perl interpreter: 
0x144bda38
    allocated at 
C:\apache2\source\mod_perl-2.0\Apache-Test\lib/Apache/Test.pm:237 by 
entersub (cloned)
leaked: sv=0x1247b184 flags=0x084046007 refcnt=0, Perl interpreter: 
0x144bda38
    allocated at -e:0 by (none) (cloned)

So it looks like the failure is just down to bugs that are already known 
about, and this doesn't really shed much light on anything :(

(Why does it say "Scalars leaked: 1" and then list 2 leaked sv's each 
time, though?)

- Steve


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