[Bug 3533] HotSpot generates code with unaligned stack, crashes on SSE operations

[bugzilla-daemon at icedtea.classpath.org]

https://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3533

--- Comment #13 from Maciej S. Szmigiero <mail at maciej.szmigiero.name> ---
(In reply to Andrew John Hughes from comment #11)
> Thanks for filing the bug.

You are welcome.

> I still don't see what has changed here to cause this bug. You've noted
> yourself that the code in the VM hasn't changed recently, so something else
> in your stack (gcc, linker, kernel, glibc) must have changed in order for
> this bug to surface.

Well, it looks like the bug was always there, but it just didn't cause any
negative effects (like crashes) until recently.

I think this change in observable behavior was caused by recent GCC versions
(like 7.3.0) getting smarter in generating SSE-aware code.

> It's also still not clear to me how to reproduce this.

I guess you want to reproduce the actual crash, not just a misaligned stack
.
You can try to rebuild icedtea with GCC 7.3.0 using
{C,XX}FLAGS="-O2 -march=pentium-m".

As far as I can remember, this on its own generated only occasional JVM
crashes,
for example when compiling a large number of java files.

The situation that JVM crashes 100% of time happens when glibc-2.26 is also
recompiled with such compiler and settings.

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