touch-packages team mailing list archive

[Alexandros Frantzis <alexandros.frantzis@xxxxxxxxxxxxx>]

As mentioned in the description, one way to leak fds is just opening and
closing an app. It leaks an fd of type 'anon_inode:[eventfd]' per app
connection. I am attaching a simple script I used to reproduce this and
track it over multiple app invocations.

Sample output from a run (omitting the lsof and /proc/*/fd information)
is:

#### Starting at 2015-09-15T08:10:55+0000 ####
# Before fds: 119
# During fds: 131
# After fds: 120
#### Starting at 2015-09-15T08:11:02+0000 ####
# Before fds: 120
# During fds: 133
# After fds: 121
#### Starting at 2015-09-15T08:11:09+0000 ####
# Before fds: 121
# During fds: 134
# After fds: 122
#### Starting at 2015-09-15T08:11:16+0000 ####
# Before fds: 122
# During fds: 135
# After fds: 123
...

You can clearly see unity8 leaking one fd every time the app connects
and disconnects.


** Attachment added: "start_stop_app.sh"
   https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1495871/+attachment/4464861/+files/start_stop_app.sh

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https://bugs.launchpad.net/bugs/1495871

Title:
  unity8 leaks file descriptors

Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  unity8 leaks file descriptors in various cases, causing the process to
  eventually fail (hang and/or restart). These leaks were first
  discovered during investigations of https://bugs.launchpad.net
  /canonical-devices-system-image/+bug/1491566 , but it's not clear yet
  if they are indeed responsible for that particular bug. In any case,
  this is a critical problem, and should be addressed independently.

  The fds are leaked in various scenarios, including:

  * opening/closing apps
  * switching between apps
  * locking the screen

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