RFR: 8230228: [TESTBUG] Several runtime/ErrorHandling tests may fail on some platforms

[Jie Fu]

Thanks Misha, Coleen and Thomas for your review.
I agree with Thomas' comments. Thanks.

Updated: http://cr.openjdk.java.net/~jiefu/8230228/webrev.01/
The patch is ready to be pushed in the updated version.

I need a sponsor.
Could someone help to push it?

Thanks a lot.
Best regards,
Jie

On 2019/8/28 上午3:36, Thomas Stüfe wrote:
> Thanks for fixing, looks reasonable.
>
> About the specific address, yes, we are aware of that. We also could 
> dynamically generate an invalid address by mmapping and mprotecting, 
> but that address would have to be communicated back to the test and 
> that would have made the test slightly more complicated than 
> necessary. Basically, it works well enough for now, and if we find 
> that it doesn't work on all platforms anymore we can change it.
>
> Cheers, Thomas
>
>
> On Tue, Aug 27, 2019, 14:56 Jie Fu <fujie at loongson.cn 
> <mailto:fujie at loongson.cn>> wrote:
>
>     Hi all,
>
>     JBS: https://bugs.openjdk.java.net/browse/JDK-8230228
>     Webrev: http://cr.openjdk.java.net/~jiefu/8230228/webrev.00/
>
>     These tests failed on our mips Fedora-21 platform.
>     ----------------------------------------------
>     jtreg:test/hotspot/jtreg/runtime/ErrorHandling/TimeoutInErrorHandlingTest.java
>     jtreg:test/hotspot/jtreg/runtime/ErrorHandling/ErrorFileRedirectTest.java
>     jtreg:test/hotspot/jtreg/runtime/ErrorHandling/BadNativeStackInErrorHandlingTest.java
>     jtreg:test/hotspot/jtreg/runtime/ErrorHandling/SafeFetchInErrorHandlingTest.java
>     ----------------------------------------------
>
>     The reason is that memory access to address 0xABC0000000000ABCULL,
>     which
>     is returned by VMError::get_segfault_address() [1], trigers
>     SIGBUS, not
>     SIGSEGV, on our platform.
>     Please note that it seems there is no way to guarantee to generate
>     SIGSEGV by accessing an specific invalid memory address for all
>     platforms [2].
>     Could you please review it and give me some advice?
>
>     Thanks a lot.
>     Best regards,
>     Jie
>
>     [1]
>     http://hg.openjdk.java.net/jdk/jdk/file/cb836bd08d58/src/hotspot/share/utilities/vmError.cpp#l68
>     [2]
>     http://hg.openjdk.java.net/jdk/jdk/file/cb836bd08d58/src/hotspot/os_cpu/bsd_x86/os_bsd_x86.cpp#l579
>
>