[Bug 1652641] [NEW] crash in indexer.py, AttributeError: 'NoneType' object has no attribute 'unlink'
Launchpad Bug Tracker
1652641 at bugs.launchpad.net
Sun Nov 26 17:20:29 UTC 2017
You have been subscribed to a public bug by Carlo Vanini (silhusk):
[Impact]
When the apt-xapian-index is already up to date, and under certain
conditions, update-apt-xapian-index throws an exception.
The index /var/lib/apt-xapian-index is up to date
Exception ignored in: <bound method ServerProgress.__del__ of
<axi.indexer.ServerProgress object at 0x7f04a5ae4c18>>
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/axi/indexer.py", line 306, in __del__
AttributeError: 'NoneType' object has no attribute 'unlink'
This happens more frequently when it is run with nice and ionice, which
is the case in the cron.weekly/apt-xapian-index cron job.
This is not severe, since the exception is thrown on exit, and depends
on the way python3 cleans up the environment. Anyway, this leaves a
socket file behind, and creates noise in cron logs (see comment #2).
The patch keeps a reference to the os.unlink function in the
ServerProgress instance, such that it has the same lifespan.
[Test Case]
* `sudo nice -n 19 ionice -c 3 update-apt-xapian-index --quiet`
* may need to run 4 times or more
* no exception is thrown
[Regression Potential]
* If the os module is unloaded anyway and self.os_unlink becomes
unreachable, we get the same exception again.
[Other Info]
* There is probably a more "pythonic" way to fix this. For instance,
avoiding __del__. That requires a larger change.
** Affects: apt-xapian-index (Ubuntu)
Importance: Medium
Status: Confirmed
** Affects: apt-xapian-index (Ubuntu Xenial)
Importance: Undecided
Status: Triaged
** Affects: apt-xapian-index (Ubuntu Zesty)
Importance: Undecided
Status: Triaged
** Tags: patch yakkety zesty
--
crash in indexer.py, AttributeError: 'NoneType' object has no attribute 'unlink'
https://bugs.launchpad.net/bugs/1652641
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