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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113721] New: [14 Regression][OpenMP][nvptx]
 cuCtxSynchronize fail when calling 'free' in the target regsion
Date: Fri, 02 Feb 2024 15:21:32 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: openmp, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: burnus at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113721

            Bug ID: 113721
           Summary: [14 Regression][OpenMP][nvptx] cuCtxSynchronize fail
                    when calling 'free' in the target regsion
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: openmp, wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: tschwinge at gcc dot gnu.org
  Target Milestone: ---
            Target: nvptx

Created attachment 57294
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57294&action=3Dedit
Compile with -fopenmp + run with nvptx offloading

I have not fully debugged this, but OpenMP Example Document example
  devices/sources/target_ptr_map.1.c
fails now.

It works if one comments the 'free(ptr3)' line but with it in, it fails wit=
h:

libgomp: cuCtxSynchronize error: unspecified launch failure (perhaps abort =
was
called)
libgomp: cuMemFree_v2 error: unspecified launch failure

* * *

* Fails with today's GCC where nvptx is configured with --with-arch=3Dsm_80.
* Fails also with -foffload=3Dnvptx-none=3D-march=3Dsm_30

* Works with AMD GPU offload

* Works using the GCC 13 distro compiler
* Works using the GCC 13 distro compiler and
  LD_LIBRARY_PATH set to the mainline compile.=