Bug 240219 - Flakey test case: sys.sys.qmath_test.qdivq_s64q
Summary: Flakey test case: sys.sys.qmath_test.qdivq_s64q
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: tests (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Only Me
Assignee: Edward Tomasz Napierala
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-08-30 20:02 UTC by Li-Wen Hsu
Modified: 2020-12-11 23:14 UTC (History)
2 users (show)

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Description Li-Wen Hsu freebsd_committer 2019-08-30 20:02:26 UTC
sys.sys.qmath_test.qdivq_s64q is unstable:

https://ci.freebsd.org/job/FreeBSD-head-amd64-test/12369/testReport/junit/sys.sys/qmath_test/qdivq_s64q/
https://ci.freebsd.org/job/FreeBSD-head-amd64-test/12387/testReport/junit/sys.sys/qmath_test/qdivq_s64q/
https://ci.freebsd.org/job/FreeBSD-head-amd64-test/12392/testReport/junit/sys.sys/qmath_test/qdivq_s64q/

*** Check failed: /usr/src/tests/sys/sys/qmath_test.c:308: 	QDIVQ(-10002376169421.736328 / -15034320172614.007812): | 98.402039 -   0.665303| =  97.736736 (max err 64.000000)

Also on i386:
https://ci.freebsd.org/job/FreeBSD-head-i386-test/6533/testReport/sys.sys/qmath_test/qdivq_s64q/
https://ci.freebsd.org/job/FreeBSD-head-i386-test/6519/testReport/sys.sys/qmath_test/qdivq_s64q/
https://ci.freebsd.org/job/FreeBSD-head-i386-test/6515/testReport/sys.sys/qmath_test/qdivq_s64q/

*** Check failed: /usr/src/tests/sys/sys/qmath_test.c:308: 	QDIVQ(-62708492.456048 / -164807648.004718): | 96.661085 -   0.380495| =  96.280590 (max err 64.000000)
Comment 1 Li-Wen Hsu freebsd_committer 2019-08-30 20:03:45 UTC
trasz: can you help check this?
Comment 2 commit-hook freebsd_committer 2019-09-03 10:49:33 UTC
A commit references this bug:

Author: lwhsu
Date: Tue Sep  3 10:49:13 UTC 2019
New revision: 351739
URL: https://svnweb.freebsd.org/changeset/base/351739

Log:
  Temporarily skip sys.sys.qmath_test.qdivq_s64q in CI because it is unstable

  PR:		240219
  Discussed with:	trasz
  Sponsored by:	The FreeBSD Foundation

Changes:
  head/tests/sys/sys/qmath_test.c
Comment 3 Ryan Libby freebsd_committer 2020-12-11 23:14:50 UTC
I've seen this running kyua for dev testing too.  It repros very
regularly with:

% kyua debug -k /usr/tests/sys/sys/Kyuafile qmath_test:qdivq_s64q

*** Check failed: /usr/src/freebsd/tests/sys/sys/qmath_test.c:312: 	QDIVQ(-3223.957586 /  -4.348088): | -0.000000 - 741.465557| = 741.465557 (max err 64.000000)
*** Check failed: /usr/src/freebsd/tests/sys/sys/qmath_test.c:312: 	QDIVQ( -0.666057 /  -0.006838): | -0.000000 -  97.403647| =  97.403647 (max err 64.000000)
*** Check failed: /usr/src/freebsd/tests/sys/sys/qmath_test.c:312: 	QDIVQ(-12136258505124932.000000 / -37248647815101.328125): |  6.546875 - 325.817425| = 319.270550 (max err 64.000000)
*** Check failed: /usr/src/freebsd/tests/sys/sys/qmath_test.c:312: 	QDIVQ(-119840516.277450 / -1321356.097985): |  2.831561 -  90.695095| =  87.863533 (max err 64.000000)

It seems in all repros so far both the numerator and denominator are
negative.