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with OpenMPI 1.6.3 I have encountered this error which "randomly" appears:
[compile:20089] opal_os_dirpath_create: Error: Unable to create the
sub-directory (/tmp/openmpi-sessions-cmpbib_at_compile_0/55528/0) of
(/tmp/openmpi-sessions-cmpbib_at_compile_0/55528/0/0), mkdir failed 
[compile:20089] [[55528,0],0] ORTE_ERROR_LOG: Error in file
util/session_dir.c at line 106
(view full stderr attached)
and also this mostly same one:
[compile:22876] opal_os_dirpath_create: Error: Unable to create the
sub-directory (/tmp/openmpi-sessions-cmpbib_at_compile_0/53197/0) of
(/tmp/openmpi-sessions-cmpbib_at_compile_0/53197/0/0), mkdir failed 
Looking deeper, I have found this in /tmp:
ls -ladtr /tmp/openmpi-sessions-cmpbib\@compile_0/* |grep -v "drwx"
-rw-r--r-- 1 cmpbib bib 93 Jan 31 06:47
-rw-r--r-- 1 cmpbib bib 92 Jan 31 06:48
-rw-r--r-- 1 cmpbib bib 93 Jan 31 07:01
-rw-r--r-- 1 cmpbib bib 92 Jan 31 09:49
-rw-r--r-- 1 cmpbib bib 93 Jan 31 11:10
-rw-r--r-- 1 cmpbib bib 93 Jan 31 14:18
-rw-r--r-- 1 cmpbib bib 93 Feb 1 18:50
So there are some *files* in /tmp which are named like the directories
which are tried to be created....
The content of the file /tmp/openmpi-sessions-cmpbib_at_compile_0/55528 is:
which looks like the content of the file "contact.txt" which seems to
appear in a successfully created directory. Also, the files have been
created far before the executions which aborted...
So, is this a bug in 1.6.3 and is there a "solution" for that?
(I know I can cleanup the files, but I expect OpenMPI to not try to
create a directory if a file with the same name exists...)