RFR: 8251152: ARM32: jtreg c2 Test8202414 test crash

[Igor Ignatyev]

Hi Filipp,

1st of all, welcome back!

it would be better to throw jtreg.SkippedException at L#46 so jtreg will reported the test as skipped (as opposed to just passed). alternative, you could use '@requires vm.simpleArch != "arm"' to exclude the test from arm32 execution.

Thanks,
-- Igor


> On Sep 1, 2020, at 8:29 AM, Filipp Zhinkin <filipp.zhinkin at gmail.com> wrote:
> 
> Hi,
> 
> Test8202414 crashes on ARM32 while writing to memory using an unaligned
> address.
> ARM32 supports unaligned memory accesses for some load/store instructions
> under certain conditions, but LDRD (which is used when we're calling
> Unsafe::putLong) is always causing alignment fault when called with an
> unaligned address [1].
> 
> The fix is simply skipping the test execution if a platform does not
> support unaligned memory accesses.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8251152
> Webrev: http://cr.openjdk.java.net/~bulasevich/fzhinkin/8251152/webrev.0/
> 
> [1] ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition, §A3.2.1
> Unaligned data access https://developer.arm.com/documentation/ddi0406/cd
> 
> Thanks,
> Filipp.