Source: openjdk-9
Version: 9~b181-4
Severity: important
Justification: causes random FTBFS in java packages when built on SMP system
Tags: patch
User: debian-al...@lists.debian.org
Usertags: alpha
X-Debbugs-CC: John Paul Adrian Glaubitz <glaub...@physik.fu-berlin.de>
Java, javac and jar can all randomly lockup (and never complete) on an
SMP Alpha system and we have a rather large don't take for building
list of various java packages on the SMP Alpha build daemons.
On a hint from John Paul Adrian Glaubitz I think I have narrowed down
the problem to insufficient memory barriers in file:
src/hotspot/src/os_cpu/linux_zero/vm/orderAccess_linux_zero.inline.hpp
and attach a patch fixing that. With the patch installed into a build
of openjdk-9 my subsequent test build of openjdk-9 built to completion
on an SMP system, giving encouragement that the patch indeed fixes the
problem.
(I also have a patch for openjdk-8 but it will take a few days to test
first.)
Cheers,
Michael.
--- openjdk-9-9~b181-orig/src/hotspot/src/os_cpu/linux_zero/vm/orderAccess_linux_zero.inline.hpp 2017-08-01 21:03:05.000000000 +1200
+++ openjdk-9-9~b181/src/hotspot/src/os_cpu/linux_zero/vm/orderAccess_linux_zero.inline.hpp 2017-08-30 20:15:31.454293665 +1200
@@ -56,8 +56,15 @@
#else // PPC
+#ifdef __alpha__
+
+#define LIGHT_MEM_BARRIER __sync_synchronize()
+
+#else // __alpha__
+
#define LIGHT_MEM_BARRIER __asm __volatile ("":::"memory")
+#endif // __alpha__
#endif // PPC
#endif // ARM
