JDK-8022203 - Intermittent test failures in demo/jvmti/hprof

[Staffan Larsen]

Yes, using different output files for the different runs sounds like a good approach. I don’t think the argument to DemoRun() specifies the output file name, though.

/Staffan

On 7 feb 2014, at 11:10, Sergei Kovalev <sergei.kovalev at oracle.com> wrote:

> Hello everyone,
> 
> I'm working for https://bugs.openjdk.java.net/browse/JDK-8022203.
> 
> The issue reproducible only on the host where it was initially discovered.
> 
> For testing I chose  demo/jvmti/hprof/OptionsTest.java test. I identified that failure occurs only with below sequence:
> 
> hprof = new DemoRun("hprof", "cpu=times,depth=0");
> hprof = new DemoRun("hprof", "cpu=old,depth=0");
> 
> here second line leads to fail with probability 1/10000. Using process monitor "ProcMon" by Sysinternals I discovered that issue caused by slippage in delete operation. According event log:
> 
> Normal file system operations looks like:
> "3:21:16.7185415 AM","java.exe","3532","CreateFile","C:\Users\aurora\jdk\sk_jdk\JTwork\scratch\java.hprof.txt","SUCCESS","Desired Access: Generic Write, Read Attributes, Disposition: OverwriteIf, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: 0, OpenResult: Created"
> 
> Operation that leads to fail:
> "3:52:30.6024647 AM","java.exe","3924","CreateFile","C:\Users\aurora\jdk\sk_jdk\JTwork\scratch\java.hprof.txt","*DELETE PENDING*","Desired Access: Generic Write, Read Attributes, Disposition: OverwriteIf, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: 0"
> 
> So this is not the test issue.
> To avoid IO operation failures I propose to use unique file name for each iteration. In this case test would not overwrite file and would not depend on filesystem performance.
> For example above code will looks like:
> 
> hprof = new DemoRun("options", "cpu=old,depth=0");
> hprof = new DemoRun("optins1", "depth=0");
> 
> Please let me know if you have any comments or suggestion.
> 
> -- 
> With best regards,
> Sergei
>