After building 4.0rc0 overnight, on my laptop, I started make test
the next morning. . I shutdown the laptop before completion as I had
to rush out the door (suspend would have been a good idea...).
Regardless, I ended up with a temporary file structure with a number
of
spawned_processes files consisting of NULLs which triggers the bug as
detailed below.
Why is there NULLs instead of numeric string? <--rhetorical question
$SAGE_BASE/sage-main/sage/interfaces/cleaner.py writes the PID
Async I/O means the PID may or may not be written on a shutdown/power
outage etc.
Patch:
(against 4.0rc0)
# HG changeset patch
# User Anthony David <ada...@adavid.com.au>
# Date 1243176398 -36000
# Node ID 958178a11b9e809788f1eda0cc29107c456a1bbe
# Parent b25ac645ae77e49db250243280eab38c2431937a
Improve write assurance of spawned_processes file by local/bin/sage-
cleaner
diff -r b25ac645ae77 -r 958178a11b9e sage/interfaces/cleaner.py
--- a/sage/interfaces/cleaner.py Thu May 21 07:10:11 2009 -0700
+++ b/sage/interfaces/cleaner.py Mon May 25 00:46:38 2009 +1000
@@ -28,6 +28,8 @@
return
o = open(F,'w')
o.write('%s %s\n'%(pid, cmd))
+ o.flush()
+ os.fsync(f.fileno())
o.close()
start_cleaner_if_not_running()
Notes:
- Linux carbonate 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007
i686 GNU/Linux
- Debian GNU/Linux 5.0
- tested patch with a shutdown during a make test, 82 spawned-
processes files created.
Successful sage-cleaner invocation on sage startup.
- no tests yet on other OSes/arches etc
- The sage-cleaner statement i=L.find(' ') in kill_spawned_jobs fails
to find any spaces
- could fix the above problem but it is better to attack the root
cause,
hence the patch to cleaner.py and not sage-cleaner
- patch could be improved by creating a temporary file and them
performing
a rename after the close.
- The debug print statements in sage-cleaner were uncommented to
assist with
defining the problem
- Don't have access to TRAC
- This is not a specific 4.0rc0 bug
Bug:
antho...@carbonate:~/sage-4.0.rc0$ ./sage
----------------------------------------------------------------------
| Sage Version 4.0.rc0, Release Date: 2009-05-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
starting the cleaner
sage: doing a cleanup
checking on 4306
it is no longer running, so we clean up
SAGE Cleaner: deleting /home/anthonyd/.sage//temp/carbonate//4306
checking on 4623
it is running
checking on 31727
it is no longer running, so we clean up
killing 31727's spawned jobs
SAGE-Cleaner: trying to kill with parent 31727
Traceback (most recent call last):
File "/home/anthonyd/sage-4.0.rc0/local/bin/sage-cleaner", line 108,
in <module>
while cleanup() > 0:
File "/home/anthonyd/sage-4.0.rc0/local/bin/sage-cleaner", line 53,
in cleanup
if not e or (e and kill_spawned_jobs(spawned_processes,
parent_pid)):
File "/home/anthonyd/sage-4.0.rc0/local/bin/sage-cleaner", line 75,
in kill_spawne\
d_jobs
os.killpg(int(pid), 9)
ValueError: invalid literal for int() with base 10: ''
...
$ ls -laR /home/anthonyd/.sage/temp/carbonate/31727/
/home/anthonyd/.sage/temp/carbonate/31727/:
total 12
drwxr-xr-x 3 anthonyd anthonyd 46 2009-05-24 06:58 .
drwxr-xr-x 9 anthonyd anthonyd 12288 2009-05-24 22:26 ..
drwxr-xr-x 2 anthonyd anthonyd 21 2009-05-24 06:58 interface
-rw-r--r-- 1 anthonyd anthonyd 10 2009-05-24 06:58
spawned_processes
/home/anthonyd/.sage/temp/carbonate/31727/interface:
total 4
drwxr-xr-x 2 anthonyd anthonyd 21 2009-05-24 06:58 .
drwxr-xr-x 3 anthonyd anthonyd 46 2009-05-24 06:58 ..
-rw-r--r-- 1 anthonyd anthonyd 110 2009-05-24 06:58 tmp31727
od -xc /home/anthonyd/.sage/temp/carbonate/31727/spawned_processes
0000000 0000 0000 0000 0000 0000
\0 \0 \0 \0 \0 \0 \0 \0 \0 \0
0000012
--
Anthony David
Gambling(n): A discretionary tax on those asleep during high school
maths
http://adavid.com.au/
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