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jasontedor merged 3 commits into from
Jul 17, 2018
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Add known issue with AVX-512 and JDK 10 #32135

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Add known issue with AVX-512 and JDK 10
jasontedor Jul 17, 2018
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jasontedor Jul 17, 2018
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jasontedor Jul 17, 2018
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46 changes: 46 additions & 0 deletions docs/reference/release-notes/6.3.asciidoc
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Expand Up @@ -3,6 +3,52 @@

Also see <<breaking-changes-6.3>>.

[IMPORTANT]
.Known issue with Elasticsearch 6.3.x on JDK 10
======================================================

There appears to be a bug in JDK 10 impacting Elasticsearch 6.3.x (note that the
official Docker images are based on JDK 10). The issue appears to impact the C2
compiler on hardware that supports
https://en.wikipedia.org/wiki/AVX-512[AVX-512 instructions] (e.g., Skylake-X
CPUs). The issue manifests as a segmentation fault in Java code executing
`org.apache.lucene.util.MergedIterator#pullTop`:

[source,txt]
----
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fc7ebc050eb, pid=1, tid=151
#
# JRE version: OpenJDK Runtime Environment (10.0.1+10) (build 10.0.1+10)
# Java VM: OpenJDK 64-Bit Server VM (10.0.1+10, mixed mode, tiered, compressed oops, concurrent mark sweep gc, linux-amd64)
# Problematic frame:
# J 14088 c2 org.apache.lucene.util.MergedIterator.pullTop()V (135 bytes) @ 0x00007fc7ebc050eb [0x00007fc7ebc041e0+0x0000000000000f0b]
----

or executing `org.apache.lucene.util.MergedIterator#pushTop`:

[source,txt]
----
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f8c43de5371, pid=1, tid=140
#
# JRE version: OpenJDK Runtime Environment (10.0.1+10) (build 10.0.1+10)
# Java VM: OpenJDK 64-Bit Server VM (10.0.1+10, mixed mode, tiered, compressed oops, concurrent mark sweep gc, linux-amd64)
# Problematic frame:
# J 13039 c2 org.apache.lucene.util.MergedIterator.pushTop()V (92 bytes) @ 0x00007f8c43de5371 [0x00007f8c43de4c40+0x0000000000000731]
----

A workaround is to disable the C2 compiler from using AVX-512 instructions via
the <<jvm-options,JVM option>> `-XX:UseAVX=2`. This issue has been taken
upstream to the JDK maintainers and the workaround will be necessary until a
version of the JDK that is not prone to this issue is released. For additional
background, see {issue}31425[#31425].

+
[[bug-6.3.1]]
[float]
=== Bug fixes
Expand Down