$ strace -efile perl -MScalar::Util=weaken -e'weaken(\my $var)' 2>&1 | grep Util\.so

##</code><code>##

stat("/usr/lib/perl5/5.8.8/auto/List/Util/Util.so", 0x63b140) = -1 ENOENT (No such file or directory)
stat("/usr/lib/perl5/5.8.8/x86_64-linux-thread-multi/auto/List/Util/Util.so", {st_mode=S_IFREG|0555, st_size=40616, ...}) = 0
open("/usr/lib/perl5/5.8.8/x86_64-linux-thread-multi/auto/List/Util/Util.so", O_RDONLY) = 6