[tor-bugs] #9645 [Tor]: Tor client goes berserk downloading microdescriptors forever, if you rm -rf its datadir

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#9645: Tor client goes berserk downloading microdescriptors forever, if you rm -rf
its datadir
--------------------+----------------------------------
 Reporter:  arma    |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:  Tor: unspecified
Component:  Tor     |        Version:
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
--------------------+----------------------------------
 Run your Tor client, with a datadirectory pointed to a new (empty or
 nonexistent) directory.

 Once the Tor client has made the datadir and satisfied itself about its
 permissions, but while it's still bootstrapping, rm -rf the datadirectory.

 It will produce an unending stream of
 {{{
 Sep 02 00:38:26.849 [warn] Couldn't open "/tmp/tordatadir/cached-
 microdescs.new" (/tmp/tordatadir/cached-microdescs.new) for writing: No
 such file or directory
 Sep 02 00:38:26.849 [warn] Couldn't append to journal in /tmp/tordatadir
 /cached-microdescs.new: No such file or directory
 }}}

 which is not surprising since the directory isn't there anymore. The sad
 part though is:
 {{{
 Sep 02 00:28:59.198 [debug] count_usable_descriptors(): 4183 usable, 0
 present (microdescs).
 Sep 02 00:28:59.207 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 Sep 02 00:28:59.215 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 Sep 02 00:29:00.812 [debug] count_usable_descriptors(): 4183 usable, 0
 present (microdescs).
 Sep 02 00:29:00.819 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 Sep 02 00:29:00.825 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 Sep 02 00:29:12.586 [debug] count_usable_descriptors(): 4183 usable, 0
 present (microdescs).
 Sep 02 00:29:12.593 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 Sep 02 00:29:12.600 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 [...]
 Sep 02 00:35:29.524 [debug] count_usable_descriptors(): 4183 usable, 0
 present (microdescs).
 Sep 02 00:35:29.532 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 Sep 02 00:35:29.539 [debug] count_usable_descriptors(): 917 usable, 0
 present (microdesc exits).
 }}}

 It seems like it's stuck in a loop realizing it doesn't have them,
 fetching them, failing to write them, realizing it doesn't have them,
 repeat.

 Found while trying to reproduce #9639.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9645>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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