https://bugzilla.redhat.com/show_bug.cgi?id=1351172
Bug ID: 1351172
Summary: perl.req gets exponentially slow in a certain scenario
Product: Fedora
Version: 22
Component: perl-generators
Assignee: jples...@redhat.com
Reporter: rel...@redhat.com
QA Contact: extras...@fedoraproject.org
CC: jples...@redhat.com,
perl-devel@lists.fedoraproject.org, ppi...@redhat.com
Description of problem:
The problem is perhaps best described by showing examples (see below) but given
certain input, perl.req gets really, really slow. This came up when I went to
upgrade the `cloc` package and `rpmbuild` seemingly got stuck and never
finished. I dug into it a tiny bit and got a smaller reproducer (again, see
below).
When I add letters to the variable name here perl.req gets *really* slow:
$ cat asdf
sub demo {
++$foo if /\s*<<'/;
}
$ time /usr/lib/rpm/perl.req asdf
real 0m0.361s
user 0m0.358s
sys 0m0.003s
--------------------------------------------------------------
$ cat asdf
sub demo {
++$foobar if /\s*<<'/;
}
$ time /usr/lib/rpm/perl.req asdf
real 0m2.891s
user 0m2.884s
sys 0m0.003s
--------------------------------------------------------------
$ cat asdf
sub demo {
++$foobarbaz if /\s*<<'/;
}
$ time /usr/lib/rpm/perl.req asdf
real 0m23.902s
user 0m23.835s
sys 0m0.019s
Version-Release number of selected component (if applicable):
perl-generators-1.06-1.fc22.noarch
How reproducible:
I haven't tested on newer Fedora. I'm planning on upgrading to F23 or F24 this
week, will be able to report then.
Steps to Reproduce:
1. Copypaste the above examples into a file
2. Run `/usr/lib/rpm/perl.req the_file`
3. ???
4. Profit
Actual results:
perl.req becomes very slow
Expected results:
perl.req doesn't become very slow. ;)
Additional info:
Happy to provide any other information, just let me know what you need.
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