gnome-software crashed with SIGTRAP in g_wakeup_new from g_main_context_new from g_dbus_connection_send_message_with_reply_sync from g_dbus_connection_call_sync_internal from g_dbus_connection_call_sync

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding gnome-software. This problem was most recently seen with package version 3.20.1+git20161013.0.d77d6cf-0ubuntu2~xenial1, the problem page at https://errors.ubuntu.com/problem/70c23d0f4e2be24b26672427d4218dc8f0823597 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.

[Sebastien Bacher (seb128)]

Robert, could you have a look to this one?

[Robert Ancell (robert-ancell)]

Looks like something is leaking file descriptors...

[Robert Ancell (robert-ancell)]

I've been playing around but haven't managed to find a descriptor leak, if someone else can reproduce this problem, please try the following from a terminal:

$ ls -l /proc/$(pidof gnome-software)/fd

Mine consistently shows about 19 descriptors open, no matter what I do (some temporarily open during actions, but they close quickly).

I'll keep looking and look for other causes.

[Iain Lane (laney)]

It looks like this is happening by far the most often with 3.20.1+git20160617.1.0440874.ubuntu-xenial-0ubuntu1~16.04.1. I don't really know why so many people are still running that outdated version, but the numbers from e.u.c. look like it might be fixed or at least better with a new version.

If you wanted to look, maybe try that version.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Robert Ancell (robert-ancell)]

Bug 1659858 has a slightly different stacktrace but seems to be the same / a related issue.

[Daniel van Vugt (vanvugt)]

Bump. 17649 occurrences of this crash during the past month according to errors.ubuntu.com

[Will Cooke (willcooke)]

Still the biggest cause of problems on errors.u.c.

[Robert Ancell (robert-ancell)]

My current line of thinking is there is a GWakeup leak somewhere, which is likely due to a GCancellable leak (that seems to be the only thing that uses it).

[Daniel van Vugt (vanvugt)]

96181 occurrences in the past month :)

This is still the #1 Ubuntu bug, triple the frequency of the #2 bug, and 10x the frequency of the #3 bug.

[Alan Pope 🍺🐧🐱 🦄 (popey)]

Looking through the individual crashers that happened today, there's something common in the 50 or so I clicked through. They're *all* running kernel 4.4 or below (one person was on 3.13).

Nobody seems to be on the HWE kernels.

So perhaps there's something which mitigates this issue in HWE kernels. If Robert was debugging and trying to reproduce locally, perhaps he's on a HWE kernel which might be why he can't reproduce?

https://errors.ubuntu.com/problem/70c23d0f4e2be24b26672427d4218dc8f0823597 - scroll down and (if you have access) click through each crash instance in turn.

[Jean-Baptiste Lallement (jibel)]

To reproduce this issue (well, rather bug 1659856 which is similar but it's been marked as invalid)

1. Install 16.04
2. Run unattended-upgrades
3. Reboot
4. Start gnome-software, close it, restart it.

[Jean-Baptiste Lallement (jibel)]

@Alan, current theory is that only security-updates are installed on these systems. They are installed via unattended-upgrades and something (likely an appstreamcli crash (bug 1711986) is preventing the installation of regular updates.

[Sebastien Bacher (seb128)]

the issue could be a result of bug #1760795

[Marius Gedminas (mgedmin)]

Saw this crash for the first time.

I'm on Ubuntu 18.10. Every time I ask gnome-software to check for updates, the number of open files (watch 'ls /proc/$(pidof gnome-software)/fd') grows by 25, then drops a bit and settles down to 7 higher than it was before.

I'm attaching two snapshots of ls -l /proc/$(pidof gnome-software)/fd, before I triggered an update check, and after it told me there were no updates available.