Thanks for the hint. I've tried the Perl debugger and found the following:

It is crashing in the module Exporter, line 64: 

[31499->31499]  DB<1> Exporter::import(/export/packages/perl-5.12.3/li
+b/5.12.3/Exporter.pm:64):
64:       *{"$callpkg\::$_"} = \&{"$pkg\::$_"} foreach @_;

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where the variables are: 
$callpkg = "Module::Runtime"
@_ = ("is_string")
$_ = "is_string"
$pkg = "Params::Classify"

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When I tried to feed the debugger with this: 
&{"$pkg\::$_"}

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the debugger crashed. So there is probably something bad going on in Params::Classify. The generated core dump shows, that it crashed in lib/params/Classify.xs:635. The backtrace is very high and starts like this: 
...
#87243 0x00007fd820981b7a in myck_entersub (my_perl=0x2143000, op=0x26
+0b250) at lib/Params/Classify.xs:635
#87244 0x00007fd820981b7a in myck_entersub (my_perl=0x2143000, op=0x26
+0b250) at lib/Params/Classify.xs:635
#87245 0x00007fd820981b7a in myck_entersub (my_perl=0x2143000, op=0x26
+0b250) at lib/Params/Classify.xs:635
#87246 0x00007fd820981b7a in myck_entersub (my_perl=0x2143000, op=0x26
+0b250) at lib/Params/Classify.xs:635
#87247 0x00007fd826cae142 in Perl_convert (my_perl=0x2143000, type=173
+, flags=192, o=0x260b250) at op.c:2652
#87248 0x00007fd826cb351c in Perl_utilize (my_perl=0x2143000, aver=1, 
+floor=147, version=0x0, idop=0x2617d20, 
    arg=0x264e210) at op.c:3979
#87249 0x00007fd826d4d17c in Perl_yyparse (my_perl=0x2143000) at perly
+.y:674
#87250 0x00007fd826ef2d6d in S_doeval (my_perl=0x2143000, gimme=2, sta
+rtop=0x0, outside=0x0, seq=2054)
    at pp_ctl.c:3112
#87251 0x00007fd826efa35e in Perl_pp_require (my_perl=0x2143000) at pp
+_ctl.c:3690
#87252 0x00007fd826da5fc8 in Perl_runops_debug (my_perl=0x2143000) at 
+dump.c:2049
#87253 0x00007fd826cdadb6 in Perl_eval_sv (my_perl=0x2143000, sv=0x216
+0e28, flags=4) at perl.c:2705
#87254 0x0000000000401a47 in perl_load_module_1 ()
#87255 0x00000000004040f9 in main ()

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The function "myck_entersub" is calling itself ad infinitum, which is not good. My guess is there's something wrong with Classify.xs. Unfortunately, I don't know how to fix it. Do you have any ideas?

In reply to Re^2: Multiple perl interpreters and Module::Runtime (-d) by daneus
in thread Multiple perl interpreters and Module::Runtime by daneus

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