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Created attachment 1539565 [details]
xxdiff test suite

Description of problem: xxdiff appears to have performance issues when using the Qt libraries from RHEL 7.6 (as opposed to 7.4).


Version-Release number of selected component (if applicable):
qt-4.8.7-2.el7

How reproducible: Consistently.


Steps to Reproduce:
Download the attached test package and follow the instructions in the README.


Actual results: xxdiff slows down by an order of magnitude when linked against the  Qt 4.8.7 libraries.

Expected results: xxdiff shows no performance slowdown when linked against the Qt 4.8.7 libraries.

Additional info:

The libraries that came with the test package are the Qt 4.8.5 libraries that were shipped with RHEL 7.4, so it seems there's a performance regression.

Using the reproducer is #c7, qt-4.8.7-3.el7 takes a few seconds and qt-4.8.7-2.el7 takes well over a minute to complete, verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2349