https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112424
Bug ID: 112424
Summary: libgomp: cuStreamSynchronize error: misaligned address
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick.be...@univ-grenoble-alpes.fr
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Created attachment 56523
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56523&action=edit
Line 39 'finalize' clause in 'exit data' directive is requested when
deallocating local variable with gfortran (only) else the second call to the
subroutine fails.
In a Fortran + openacc subroutine, using a local allocatable array offloaded on
the GPU requires the "finalize" clause in the "exit data" directive. Without
this directive, the next call to the routine fails with:
libgomp: cuStreamSynchronize error: misaligned address
Provided code show a subroutine called "doinit" using a local "tmp" array
offloaded. Line 39 the "finalize" clause is requested with gfortran (not with
nvfortran or cray fortran). Without it the econd call to the routine fails.
The main program calls twice the routine and check the values on the host
before and after an update from the device to be sure we are executing on GPU.
Gfortran is OG13 or 14 (GNU Fortran (GCC) 14.0.0 20231106 (experimental))
Tested on Nvidia A100 and AMD MI250 GPUs.
Correct output with "finalize" clause line 39:
Check on host OK
Check values uploaded from GPU OK
Check on host OK
Check values uploaded from GPU OK
Output without "finalize" clause line 39:
Check on host OK
Check values uploaded from GPU OK
libgomp: cuStreamSynchronize error: misaligned address
