[jdk8u-dev] RFR: 8255466: C2 crashes at ciObject::get_oop() const+0x0 [v3]

[SendaoYan]

On Fri, 31 Jan 2025 05:49:30 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>> This is backport of JDK-8255466, to fixes the corner case in C2. This PR also fix the compiler warning `hotspot/src/share/vm/opto/type.cpp:2556:71: error: ‘this’ pointer is null` with gcc13.
>> Patch does not apply cleanly due to in jdk8u, the jtreg tag @run main need add `bootclasspath`.
>> New test fails without the patch, passes with it.
>> 
>> Additional testing:
>> 
>> - [x] linux x64 tier1/2/3 jtreg test
>> - [x] linux aarch64 tier1/2/3 jtreg test
>
> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add a whitespace

GHA report several test failures, expect the CA issue which has been fixing by https://github.com/openjdk/jdk8u-dev/pull/526. Other failure shows as below:

1. Macos x64 'compiler/unsafe/OpaqueAccesses.java' [fails](https://github.com/sendaoYan/jdk8u-dev-ysd/actions/runs/13067155994/job/36461702188) 'SIGSEGV  in Unsafe_GetInt', This test also fails in [PR551](https://github.com/openjdk/jdk8u-dev/pull/551) and fixing by https://github.com/openjdk/jdk8u-dev/pull/553, it's unrelated to this PR.
2. Macos x64 'com/sun/jdi/PrivateTransportTest.sh' [fails](https://github.com/sendaoYan/jdk8u-dev-ysd/actions/runs/13067155994/job/36461701888) 'JDWP exit error AGENT_ERROR_TRANSPORT_LOAD(196): No transports initialized', which recorded by [JDK-8216265](https://bugs.openjdk.org/browse/JDK-8216265). This test also fails in https://github.com/openjdk/jdk8u-dev/pull/551,it's unralated to this PR.
3. Macos x64 'sun/misc/CopyMemory.java' [fails](https://github.com/sendaoYan/jdk8u-dev-ysd/actions/runs/13067155994/job/36461701888) 'Unsafe_SetByte', this issue fixing by https://github.com/openjdk/jdk8u-dev/pull/553, it's unralated to this PR.

-------------

PR Comment: https://git.openjdk.org/jdk8u-dev/pull/536#issuecomment-2628770718