RFA: 8166197: assert(RelaxAssert || w != Thread::current()->_MutexEvent) failed: invariant

[Yangfei (Felix)]

Hi,

    Thanks for looking at this. 
    Since the original bug is Inaccessible, I need push approval from 8u maintainers. 
    Anyone please?

Thank,
Felix

> -----Original Message-----
> From: Hohensee, Paul [mailto:hohensee at amazon.com]
> Sent: Tuesday, August 10, 2021 12:12 AM
> To: Yangfei (Felix) <felix.yang at huawei.com>; jdk8u-dev <jdk8u-
> dev at openjdk.java.net>
> Subject: Re: RFA: 8166197: assert(RelaxAssert || w != Thread::current()-
> >_MutexEvent) failed: invariant
> 
> Lgtm.
> 
> Thanks,
> Paul
> 
> -----Original Message-----
> From: jdk8u-dev <jdk8u-dev-retn at openjdk.java.net> on behalf of "Yangfei
> (Felix)" <felix.yang at huawei.com>
> Date: Monday, August 9, 2021 at 12:33 AM
> To: jdk8u-dev <jdk8u-dev at openjdk.java.net>
> Subject: RFA: 8166197: assert(RelaxAssert || w != Thread::current()-
> >_MutexEvent) failed: invariant
> 
> Hi,
> 
> Please review this 8u backport fixing a memory-ordering issue.
> 
> Original bug: https://bugs.openjdk.java.net/browse/JDK-8166197
> Original patch: https://github.com/openjdk/jdk11u-
> dev/commit/7e084fd81fc5ef3e8245dc2381d4f13c016746c5
> Original RFR thread: https://mail.openjdk.java.net/pipermail/hotspot-
> runtime-dev/2016-October/021565.html
> 
> Note that original bug is closed for review so I cannot add labels.
> This issue can be reproduced stably on my 128-core aarch64 server with 8u
> fastdebug build by running this jtreg test:
> $ jtreg -othervm hotspot/test/stress/gc/TestStressRSetCoarsening.java
> Crash log looks like [1].
> 
> Original 11u patch cannot be applied cleanly due to changes in surrounding
> context.
> 8u webrev: http://cr.openjdk.java.net/~fyang/8166197-8u/webrev.00
> 
> Tested with jtreg using 8u aarch64 fastdebug build. The above mentioned
> jtreg test failed quickly before fix and pass after.
> 
> Thanks,
> Felix
> 
> [1]
> # To suppress the following error report, specify this argument # after -XX: or
> in .hotspotrc:  SuppressErrorAt=/mutex.cpp:589 # # A fatal error has been
> detected by the Java Runtime Environment:
> #
> #  Internal Error (/home/yangfei/openjdk8u-
> dev/hotspot/src/share/vm/runtime/mutex.cpp:589), pid=27757,
> tid=0x0000fffed1fe61e0 #  assert(RelaxAssert || w != Thread::current()-
> >_MutexEvent) failed: invariant # # JRE version: OpenJDK Runtime
> Environment (8.0) (build 1.8.0-internal-fastdebug-
> yangfei_2021_08_09_10_45-b00)
> # Java VM: OpenJDK 64-Bit Server VM (25.71-b00-fastdebug mixed mode
> linux-aarch64 compressed oops) # Core dump written. Default location:
> /home/yangfei/openjdk8u-dev/JTwork/scratch/4/core or core.27757 # # An
> error report file with more information is saved as:
> # /home/yangfei/openjdk8u-dev/JTwork/scratch/4/hs_err_pid27757.log
> #
> # If you would like to submit a bug report, please visit:
> #   http://bugreport.java.com/bugreport/crash.jsp
> #
> Current thread is 281469909885408
> Dumping core ...