C2 crash in PhaseIdealLoop::build_loop_late_post_work

[Doerr, Martin]

Hi again,

I just found it:
https://bugs.openjdk.java.net/browse/JDK-8251925

Crash happens when compiling the following method:
Current CompileTask:
C2:  12413 13451       4       org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificUnsafeProjection::apply (928 bytes)

Best regards,
Martin


From: Doerr, Martin
Sent: Dienstag, 27. Oktober 2020 12:07
To: 'hotspot-compiler-dev at openjdk.java.net' <hotspot-compiler-dev at openjdk.java.net>
Subject: C2 crash in PhaseIdealLoop::build_loop_late_post_work

Hi,

we observe C2 crashes on all x86_64 platforms when running Renaissance Benchmark "log-regression" since 2020-08-10.
(hg was at "8250848: [aarch64] nativeGotJump_at() missing call to verify()." when we've seen it first.)


#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffd594e9322, pid=1439804, tid=1516348

#

# JRE version: OpenJDK Runtime Environment (16.0.0.1) (build 16.0.0.1-internal+0-adhoc.openjdk.jdk-dev)

# Java VM: OpenJDK 64-Bit Server VM (16.0.0.1-internal+0-adhoc.openjdk.jdk-dev, mixed mode, sharing, tiered, compressed oops, g1 gc, windows-amd64)

# Problematic frame:

# V  [jvm.dll+0x559322]  PhaseIdealLoop::build_loop_late_post_work+0x212



Host: Intel(R) Xeon(R) CPU E7-8880 v4 @ 2.20GHz, 8 cores, 15G,  Windows Server 2016 , 64 bit Build 14393 (10.0.14393.3630)

Time: Sat Oct 24 19:40:57 2020 W. Europe Daylight Time elapsed time: 16.016253 seconds (0d 0h 0m 16s)


V  [jvm.dll+0x559322]  PhaseIdealLoop::build_loop_late_post_work+0x212  (loopnode.cpp:5312)

V  [jvm.dll+0x5590b4]  PhaseIdealLoop::build_loop_late+0x214  (loopnode.cpp:5159)

V  [jvm.dll+0x558418]  PhaseIdealLoop::build_and_optimize+0x7b8  (loopnode.cpp:3874)

V  [jvm.dll+0x21410a]  Compile::optimize_loops+0x15a  (compile.cpp:1960)

V  [jvm.dll+0x20d900]  Compile::Optimize+0xf90  (compile.cpp:2184)

V  [jvm.dll+0x20b105]  Compile::Compile+0xba5  (compile.cpp:735)

V  [jvm.dll+0x19de6b]  C2Compiler::compile_method+0xab  (c2compiler.cpp:104)

Is this a known problem?

Best regards,
Martin