Bug 99992 - test/test-bezier.c dumps core on arm64/ppc/ppc64el
Summary: test/test-bezier.c dumps core on arm64/ppc/ppc64el
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Input/libinput (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Peter Hutterer
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-02-27 21:57 UTC by Timo Aaltonen
Modified: 2017-03-09 06:54 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:


Attachments
build log on ppc (149.02 KB, text/plain)
2017-02-27 21:57 UTC, Timo Aaltonen
no flags Details

Description Timo Aaltonen 2017-02-27 21:57:15 UTC
Created attachment 129969 [details]
build log on ppc

Hi, 0.24.0 added a new test for wacom, but running it fails on (at least) these archs. Build log attached.
Comment 1 Peter Hutterer 2017-02-28 02:47:10 UTC
This appears to be a result of optimization. 

With -O0

Breakpoint 1, test_nonzero_x_linear () at test-bezier.c:157
157			assert(bezier[x] > bezier[x-1]);
(gdb) p bezier
$6 = {0 <repeats 409 times>, 1, 2, 4, 5, 7, 9, 10, 12, 14, 15, 17, 19, 21, 22, 

With -O2:
(gdb) p bezier
$1 = {0 <repeats 410 times>, 1, 3, 5, 7, 9, 10, 12, 14, 15, 17, 19, 20, 22,

That extra 0 at -O2 triggers the bug. There are other entries that don't match either, but only this one would trigger the bug.
Comment 2 Peter Hutterer 2017-02-28 05:31:53 UTC
https://patchwork.freedesktop.org/patch/141130/
Comment 3 Timo Aaltonen 2017-02-28 06:18:18 UTC
yep, that works, thanks
Comment 4 Peter Hutterer 2017-03-09 02:21:45 UTC
commit 72fb6d304eec6eeeac6b42963c2729134d56de57
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Tue Feb 28 14:45:29 2017 +1000

    test: fix a test failure on ppc64(le) and aarch64


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