Bug 849279
Summary: | JDK calculates incorrectly | ||||||||
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Product: | [Fedora] Fedora | Reporter: | Need Real Name <mal> | ||||||
Component: | java-1.7.0-openjdk | Assignee: | Orphan Owner <extras-orphan> | ||||||
Status: | CLOSED EOL | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||
Severity: | unspecified | Docs Contact: | |||||||
Priority: | unspecified | ||||||||
Version: | 23 | CC: | dbhole, jvanek, omajid | ||||||
Target Milestone: | --- | ||||||||
Target Release: | --- | ||||||||
Hardware: | Unspecified | ||||||||
OS: | Unspecified | ||||||||
Whiteboard: | |||||||||
Fixed In Version: | Doc Type: | Bug Fix | |||||||
Doc Text: | Story Points: | --- | |||||||
Clone Of: | Environment: | ||||||||
Last Closed: | 2016-12-20 12:17:40 UTC | Type: | Bug | ||||||
Regression: | --- | Mount Type: | --- | ||||||
Documentation: | --- | CRM: | |||||||
Verified Versions: | Category: | --- | |||||||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
Cloudforms Team: | --- | Target Upstream Version: | |||||||
Embargoed: | |||||||||
Attachments: |
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Description
Need Real Name
2012-08-18 00:11:05 UTC
Created attachment 605282 [details]
The code
The code. Tested on 3 different computers.
with
java -version
java version "1.7.0_05-icedtea"
OpenJDK Runtime Environment (fedora-2.2.1.fc17.9-x86_64)
OpenJDK 64-Bit Server VM (build 23.0-b21, mixed mode)
always give a failure above
Interesting that java -XX:LoopUnrollLimit=1 PolynomialRoot give no this error on java -version java version "1.7.0_05-icedtea" OpenJDK Runtime Environment (fedora-2.2.1.fc17.9-x86_64) OpenJDK 64-Bit Server VM (build 23.0-b21, mixed mode) java -XX:LoopUnrollLimit=1 PolynomialRoot ....... !!!!!!!!n=4 test 30977 !!!!!!!!n=4 test 30978 !!!!!!!!n=4 test 30979 !!!!!!!!n=4 test 30980 !!!!!!!!n=4 test 30981 ....... There is just a single relevant loop in attached code: int jmin=0; double vmin=Math.abs(u[jmin]); for(int j=1;j<3;j++) { final double vx=Math.abs(u[j]); if(vx<vmin) { vmin=vx; jmin=j; } } final double u1=u[(jmin+1)%3],u2=u[(jmin+2)%3]; The option java -XX:-UseLoopPredicate PolynomialRoot also make the unit test passing OK And setting two options simultaneously java -XX:LoopUnrollLimit=1 -XX:-UseLoopPredicate PolynomialRoot give an error !!!!!!!!n=4 test 779 !!!!!!!!n=4 test 780 !!!!!!!!n=4 test 781 Exception in thread "main" java.lang.RuntimeException: order=4 p[0]=-0.3643937449673187;p[1]=0.26975356192753797;p[2]=0.469327423289146;p[3]=0.5513987308711439;p[4]=0.4989414549559419; x.r=-0.22593059759284145 x.i=0.8351448422318095 res/sabs=-0.02103905708525171 ims/sabs=0.0025556115548346493 sabs=16.016871636436743 res=-0.3369798766861416 ims=0.0409329022263811 n=4 eps=1.0E-6 sabs>1/eps=false f1=true f2=true t=781 at PolynomialRoot.checkValues(PolynomialRoot.java:424) at PolynomialRoot.testRoots(PolynomialRoot.java:491) at PolynomialRoot.main(PolynomialRoot.java:762) as well as java -XX:LoopUnrollLimit=0 -XX:-UseLoopPredicate PolynomialRoot !!!!!!!!n=4 test 809 !!!!!!!!n=4 test 810 Exception in thread "main" java.lang.RuntimeException: order=4 p[0]=-0.7203446925952928;p[1]=0.9162323551969194;p[2]=0.7020835015265718;p[3]=0.6581445844611;p[4]=0.65585375261305; x.r=-0.05428215319033669 x.i=0.9322319811155485 res/sabs=-0.04156563071819642 ims/sabs=0.0192423628643677 sabs=19.243195867204115 res=-0.7998555732541297 ims=0.3702845575468425 n=4 eps=1.0E-6 sabs>1/eps=false f1=true f2=true t=810 at PolynomialRoot.checkValues(PolynomialRoot.java:424) at PolynomialRoot.testRoots(PolynomialRoot.java:491) at PolynomialRoot.main(PolynomialRoot.java:762) but again. Single -XX:LoopUnrollLimit=1 or -XX:-UseLoopPredicate produce no error But together they do produce an error (as well as when the code is run without any option) single option produce no error Another thing - the failure almost never occur on a computer with high load. Idle computer give a failure almost immediately. Still the same problem in java -version java version "1.7.0_09-icedtea" OpenJDK Runtime Environment (fedora-2.3.3.fc17.1-x86_64) OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode) Created attachment 656014 [details]
Same failure on Oracle jdk
same thing with Oracle JDK
java -version
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode)
java PolynomialRoot
.....
!!!!!!!!n=4 test 777
!!!!!!!!n=4 test 778
!!!!!!!!n=4 test 779
Exception in thread "main" java.lang.RuntimeException: order=4 p[0]=0.9757454361894038;p[1]=0.0;p[2]=-0.9063855238682716;p[3]=0.8365853061995829;p[4]=-0.48284015470752206;
x.r=0.6072512814712652 x.i=0.9978109661117348
res/sabs=0.05808884723864624 ims/sabs=-0.021584173284394766 sabs=12.62240660496392
res=0.7332210490598285 ims=-0.2724442114276303 n=4 eps=1.0E-6 sabs>1/eps=false f1=true f2=true t=779
at PolynomialRoot.checkValues(PolynomialRoot.java:426)
at PolynomialRoot.testRoots(PolynomialRoot.java:493)
at PolynomialRoot.main(PolynomialRoot.java:764)
And disabling hotspot java -Xint PolynomialRoot Make the test passing OK This well documented with test case provided bug some time ago was submitted to Oracle java bug database as 2396372 There is no reaction. Same thing with other bugs I submitted to Oracle. java development at Oracle is stalled and Oracle does not care about bugs. Can somebody look at fix this bug here. The test case is provided. It should not be difficult. This message is a reminder that Fedora 18 is nearing its end of life. Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 18. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '18'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 18's end of life. Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 18 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior to Fedora 18's end of life. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component. This bug appears to have been reported against 'rawhide' during the Fedora 23 development cycle. Changing version to '23'. (As we did not run this process for some time, it could affect also pre-Fedora 23 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 23 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora23 This message is a reminder that Fedora 23 is nearing its end of life. Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 23. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '23'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 23 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed. |