(synopsis is provisional until root cause is found)

In tier1 on arm32 at least two tests are failing:

compiler/classUnloading/methodUnloading/TestMethodUnloading.java
jdk/internal/shellsupport/doc/JavadocHelperTest.java

Crashes with:

# SIGBUS (0x7) at pc=0xb3293ab4, pid=10272, tid=10275
#
# JRE version: OpenJDK Runtime Environment (14.0) (fastdebug build 14-internal+0-adhoc.pi.jdk-jdk)
# Java VM: OpenJDK Server VM (fastdebug 14-internal+0-adhoc.pi.jdk-jdk, mixed mode, sharing, g1 gc, linux-arm)
# Problematic frame:
# v ~StubRoutines::atomic_load_long
#

...

Host: raspberrypi, rev 3 (v7l), 4 cores, 3G, Raspbian GNU/Linux 10 (buster)
Time: Tue Sep 17 11:12:05 2019 BST elapsed time: 1 seconds (0d 0h 0m 1s)

--------------- T H R E A D ---------------

Current thread (0xb5485000): GCTaskThread "GC Thread#0" [stack: 0x94a0f000,0x94a8f000] [id=10275]

Stack: [0x94a0f000,0x94a8f000], sp=0x94a8dba8, free space=506k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
v ~StubRoutines::atomic_load_long

siginfo: si_signo: 7 (SIGBUS), si_code: 1 (BUS_ADRALN), si_addr: 0x801edf3c

Register to memory mapping:

  r0 = 0x801edf3c
0x801edf3c is pointing into metadata


I believe this tries to access some metadata location with misaligned atomic access. 0x801edf3c is aligned by 4, should be aligned by 8.