Bug ID: JDK-8320587 TestAlignVectorFuzzer fails on ARM32

Type: Bug
Component: hotspot
Sub-Component: compiler
Affected Version: 22

Priority: P3
Status: Open
Resolution: Unresolved
OS: linux
CPU: arm

Submitted: 2023-11-22
Updated: 2025-08-25

Versions (Unresolved/Resolved/Fixed)

The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

To download the current JDK release, click here.

Other
tbdUnresolved

Recent JDK-8310190 change added TestAlignVectorFuzzer test. The test fails intermittently on ARM32. It is pre-existing bug, it can be reproduced on builds without JDK-8310190 change.

# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/home/ubuntu/jdk/src/hotspot/cpu/arm/assembler_arm_32.hpp:647), pid=55748, tid=55762
#  assert(fn->hi_bit() == 0 && fd->hi_bit() == 0 && fm->hi_bit() == 0) failed: double precision register 0x10 0x22 0x8?
#
# JRE version: OpenJDK Runtime Environment (22.0) (fastdebug build 22-internal-adhoc.ze-user.jdk)
# Java VM: OpenJDK Server VM (fastdebug 22-internal-adhoc.ze-user.jdk, mixed mode, g1 gc, linux-arm)
# Problematic frame:
# V  [libjvm.so+0x162490]  Assembler::fadds(FloatRegisterImpl*, FloatRegisterImpl*, FloatRegisterImpl*, AsmCondition)+0xc7
#

Causes :	JDK-8366076 - [aarch32] Invalid registers allocated for vector instructions.
Relates :	JDK-8310190 - C2 SuperWord: AlignVector is broken, generates misaligned packs