[aarch64-port-dev ] Sporadic crashes on aarch64 after switching from OpenJDK 9 to 10

[Stephan Bergmann]

On 20/06/18 08:27, Aleksey Shipilev wrote:
> On 06/20/2018 08:16 AM, Stephan Bergmann wrote:
>>> That's a safepoint SEGV.  It's deliberate.  If you step at that
>>> point you'll enter the safepoint code.
> 
> ...
> 
>>> What exactly is the failure?
>>
>> The failure is that the process (running a C++ cppunittester executable, with an in-process
>> instantiated JVM) terminates due to a SIGSEGV.  When inspecting the generated core file with gdb, it
>> claims the above thread caused that "fatal" SIGSEGV.
> 
> My first bet would be that cpuunittester had installed its own signal handlers that overwrote JVM's
> SEGV handlers that are required for normal operation. You would need to use jsig to make JVM work in
> that config, see:
>    https://docs.oracle.com/javase/8/docs/technotes/guides/vm/signal-chaining.html

cppunittester sets up all its signal handlers (which do /not/ include 
one for SIGSEGV) way before the in-process JVM is instantiated, so this 
always used to work fine without a need to LD_PRELOAD libjsig.so. 
However, trying with LD_PRELOAD nevertheless, I could no longer 
reproduce the (sporadic) failure.  Odd.