#13826: Race condition in star_imports cache
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Reporter: vbraun | Owner: GeorgSWeber
Type: defect | Status: new
Priority: blocker | Milestone: sage-5.5
Component: build | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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See https://groups.google.com/d/topic/sage-devel/SN88f9qEIV8/discussion
The patchbot there sporadically fails on various tests with errors of
the type
{{{
Traceback (most recent call last):
File "/mnt/storage2TB/patchbot/.sage/tmp/
volker_desktop.stp.dias.ie-14095/multireplace_29004.py", line 6, in
<module>
from sage.all_cmdline import *;
File "/mnt/storage2TB/patchbot/Sage/sage-5.5.rc0/local/lib/python/
site-packages/sage/all_cmdline.py", line 14, in <module>
from sage.all import *
File "/mnt/storage2TB/patchbot/Sage/sage-5.5.rc0/local/lib/python/
site-packages/sage/all.py", line 72, in <module>
from sage.rings.all import *
File "/mnt/storage2TB/patchbot/Sage/sage-5.5.rc0/local/lib/python/
site-packages/sage/rings/all.py", line 169, in <module>
lazy_import("sage.rings.universal_cyclotomic_field.all","*")
File "lazy_import.pyx", line 850, in
sage.misc.lazy_import.lazy_import (sage/misc/lazy_import.c:5168)
names[ix:ix+1] = get_star_imports(module)
File "lazy_import.pyx", line 900, in
sage.misc.lazy_import.get_star_imports (sage/misc/lazy_import.c:5924)
star_imports = pickle.load(open(cache_file))
EOFError
}}}
The patchbot is on a separate harddisk, mounted under /mnt/storage2TB. But
my temp directory is tmpfs. So the pickle is moved across block devices,
which is of course not atomic. Hence the patchbot sometimes dies here
while opening a half-written file. The temporary file should be created in
the target directory, only then can we be sure that the move is atomic.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13826>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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