Java crash in JFR pd_get_top_frame_for_profiling

Issue

• Random crashes with the following in the fatal error log:

#  SIGSEGV (0xb) at pc=0x00007fff7fd30634, pid=105812, tid=0x00007ffe958df170
#
# JRE version: OpenJDK Runtime Environment (8.0_282-b08) (build 1.8.0_282-b08)
# Java VM: OpenJDK 64-Bit Server VM (25.282-b08 mixed mode linux-ppc64le compressed oops)
# Problematic frame:
# V  [libjvm.so+0xbe0634]  JavaThread::pd_get_top_frame_for_profiling(frame*, void*, bool)+0x1f4
...

Current thread (0x00007ffeb4ee1800):  Thread [stack: 0x00007ffe956e0000,0x00007ffe958e0000] [id=107493]

siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr: 0x0000000000000020

Stack: [0x00007ffe956e0000,0x00007ffe958e0000],  sp=0x00007ffe958ddcc0,  free space=2039k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0xbe0634]  JavaThread::pd_get_top_frame_for_profiling(frame*, void*, bool)+0x1f4
V  [libjvm.so+0x63193c]  JfrGetCallTrace::get_topframe(void*, frame&)+0x4c
V  [libjvm.so+0x68dd44]  OSThreadSamplerCallback::call()+0xe4
V  [libjvm.so+0x9af3bc]  os::ThreadCrashProtection::call(os::CrashProtectionCallback&)+0xcc
V  [libjvm.so+0x68888c]  OSThreadSampler::do_task(os::SuspendedThreadTaskContext const&) [clone .part.36]+0x5c
V  [libjvm.so+0x9a0c44]  os::SuspendedThreadTask::internal_do_task()+0x414
V  [libjvm.so+0x98d2f8]  os::SuspendedThreadTask::run()+0x28
V  [libjvm.so+0x689224]  JfrThreadSampleClosure::do_sample_thread(JavaThread*, JfrStackFrame*, unsigned int, JfrSampleType)+0x2b4
V  [libjvm.so+0x68d668]  JfrThreadSampler::task_stacktrace(JfrSampleType, JavaThread**) [clone .constprop.66]+0x388
V  [libjvm.so+0x68db68]  JfrThreadSampler::run()+0x248
V  [libjvm.so+0x99650c]  java_start(Thread*)+0x22c
C  [libpthread.so.0+0x87c8]  start_thread+0xf8