Hi, I am trying to launch an application using mpi on top of apache Yarn. I am using the trick described in this old post https://lists.mpich.org/mailman/htdig/devel/2016-July/000717.html. When I try it outside Yarn, all works fine, but inside Yarn I have an issue in mpiexec : "munmap_chunk(): invalid pointer" I cannot reproduce the bug outside of yarn. I have try with the release 3.4a2 of hydra, but I still have the bug. Here is the backtrace I got from the core dump (on the 3.4a2 release). #1 0x00007f0811d88801 in __GI_abort () at abort.c:79 #2 0x00007f0811dd1897 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f0811efeb9a "%s\n") at ../sysdeps/posix/libc_fatal.c:181 #3 0x00007f0811dd890a in malloc_printerr (str=str@entry=0x7f0811f007a8 "munmap_chunk(): invalid pointer") at malloc.c:5350 #4 0x00007f0811ddfecc in munmap_chunk (p=0x7fffbcc9a8cc) at malloc.c:2846 #5 __GI___libc_free (mem=mem@entry=0x7fffbcc9a8dc) at malloc.c:3117 #6 0x000055ad7edca224 in HYDU_find_in_path (execname=execname@entry=0x7fffbcc9a8ab "mpiexec", path=0x55ad7f0b3990 <HYD_server_info+144>) at utils/args/args.c:108 #7 0x000055ad7edb1c48 in HYD_uii_mpx_get_parameters (t_argv=<optimized out>) at ui/mpich/utils.c:1751 #8 0x000055ad7edaa9d6 in main (argc=<optimized out>, argv=0x7fffbcc99d68) at ui/mpich/mpiexec.c:147 Any help would be greatly appreciated Bruno _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.