This bug was fixed in the package cpustat - 0.01.25-1ubuntu0
---------------
cpustat (0.01.25-1ubuntu0) xenial; urgency=medium
* Only add pid info to hash table if it is new (LP: #1631050)
- fixes double free error on exit
-- Colin King <[email protected]> Thu, 6 Oct 2016 17:17:18
+0100
** Changed in: cpustat (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1631050
Title:
cache'd pid recycling adds cached info to hash again causing double
free on exit cleanup
Status in cpustat package in Ubuntu:
Fix Released
Status in cpustat source package in Xenial:
Fix Released
Bug description:
[XENIAL SRU]
[Impact]
Cached pid info is added to the hash table even when it's a re-used pid info
causing a double free on exit cleanup. Only add pid info to hash table if it
is newly allocated.
[Test Case]
Run cpustat for a long duration as follows:
cpustat 1 -T -g
..and work through a lot of processes IDs until we re-use a PID, e.g.:
stress-ng --fork 0 &
and stop cpustat with SIGINT, one hits a double free as it exits
[Regression Potential]
Minimal, the fix stops an item being added to a cache'd hash list more
than once, and that is a minimal impact on the main cpustat
functionality.
[Fix]
Upstream commit
http://kernel.ubuntu.com/git/cking/cpustat.git/commit/?id=dc7d2fe45560c414645bc286a7cd63f13b69dc6c
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