URGENT RFR(XS): 8202386 [BACKOUT] fix for 8200235

[Daniel D. Daugherty]

Greetings,

Recent testing has revealed an issue with the following fix:

     JDK-8200235 Generalize jniFastGetField jobject/jweak resolve
     https://bugs.openjdk.java.net/browse/JDK-8200235

The following bug is tracking the new failure mode:

     JDK-8202381 (Solaris) SIGBUS in # V [libjvm.so+0xcee494] 
jni_GetIntField+0x224
     https://bugs.openjdk.java.net/browse/JDK-8202381

The following bug is being used to backout the fix for JDK-8200235:

     JDK-8202386 [BACKOUT] fix for 8200235
     https://bugs.openjdk.java.net/browse/JDK-8202386


Here's the backout webrev:

http://cr.openjdk.java.net/~dcubed/8202386-webrev/0_for_jdk_jdk/

The backout was generated by:

     $ hg log -v -r 4745598b307f
     changeset:   49898:4745598b307f
     user:        eosterlund
     date:        Thu Apr 26 11:56:24 2018 +0200
     files: 
src/hotspot/cpu/aarch64/gc/shared/barrierSetAssembler_aarch64.cpp 
src/hotspot/cpu/aarch64/gc/shared/barrierSetAssembler_aarch64.hpp 
src/hotspot/cpu/aarch64/jniFastGetField_aarch64.cpp 
src/hotspot/cpu/sparc/gc/shared/barrierSetAssembler_sparc.cpp 
src/hotspot/cpu/sparc/gc/shared/barrierSetAssembler_sparc.hpp 
src/hotspot/cpu/sparc/jniFastGetField_sparc.cpp 
src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.cpp 
src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.hpp 
src/hotspot/cpu/x86/jniFastGetField_x86_64.cpp
     description:
     8200235: Generalize jniFastGetField jobject/jweak resolve
     Reviewed-by: kbarrett, dholmes

     $ hg backout 4745598b307f
     9 files updated, 0 files merged, 0 files removed, 0 files unresolved
     changeset 4745598b307f backed out, don't forget to commit.

     $ hg commit

     $ hg log -v -r tip
     changeset:   49917:a1765a10c340
     tag:         tip
     user:        dcubed
     date:        Fri Apr 27 14:56:20 2018 -0400
     files: 
src/hotspot/cpu/aarch64/gc/shared/barrierSetAssembler_aarch64.cpp 
src/hotspot/cpu/aarch64/gc/shared/barrierSetAssembler_aarch64.hpp 
src/hotspot/cpu/aarch64/jniFastGetField_aarch64.cpp 
src/hotspot/cpu/sparc/gc/shared/barrierSetAssembler_sparc.cpp 
src/hotspot/cpu/sparc/gc/shared/barrierSetAssembler_sparc.hpp 
src/hotspot/cpu/sparc/jniFastGetField_sparc.cpp 
src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.cpp 
src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.hpp 
src/hotspot/cpu/x86/jniFastGetField_x86_64.cpp
     description:
     Merge

I sanity checked the backout with:


$ hg diff -r 49897 `cat file.list` | wc
        0       0       0

which compares the changeset before 49898:4745598b307f
with the current tip. All is good.

Dan