RFR: 8279887: 2 Null pointer dereference defect groups in os_posix.cpp [v2]

[Christian Hagedorn]

On Wed, 19 Jan 2022 19:56:21 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this small fix to prevent possible Null pointer dereferences.  The fix adds a Null check to prevent trying to park a Null thread.  The Null check is needed because UNSAFE_ENTRY calls thread_from_jni_environment(), which returns NULL if the env thread is terminated. 
>> 
>> The fix was tested with Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-5 on Linux x64.
>> 
>> Thanks, Harold
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add comment

Could turning this into a sanity assertion check with the comment as a failure message be an option instead?

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PR: https://git.openjdk.java.net/jdk/pull/7129