Debugging segmentation faults in the JVM on linux-powerpc

John Paul Adrian Glaubitz glaubitz at
Mon Jun 12 12:01:48 UTC 2017

Hi Severin!

On Mon, Jun 12, 2017 at 01:51:20PM +0200, Severin Gehwolf wrote:
> It smells a lot like the GCC issues we've run across when building with
> newer compilers in Fedora/RHEL.

That's something that I have been thinking of as well. Especially
since the problem goes away when building with


> Here is one example which turned out to be a GCC bug:

Aha, thanks for the pointer.

> Others were UB in hotspot code:
> Which GCC version is this?

gcc version 6.3.0 20170516 (SVN r248076 from the 6 branch).

> Provided this is a GCC issue:
> In order to figure out which new optimization might have caused this,
> I'd suggest to go through the list of new opto flags that are on by
> default in the new version and disable one by one.

Good idea, I will try that. Thanks!

> Once you know which opto flag causes it, you might be able to figure
> out which object file causes the problem with something like this:
> It might be something else entirely.

Very good pointers. I will try what you have suggested.


 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at
`. `'   Freie Universitaet Berlin - glaubitz at
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