/usr/libexec/ibus-ui-gtk3:11:__vfprintf_internal:buffered_vfprintf:IO_validate_vtable:__vfprintf_internal:___fprintf_chk

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding ibus. This problem was most recently seen with package version 1.5.22-2ubuntu2, the problem page at https://errors.ubuntu.com/problem/3a012dedb557f699d32a1f5c166d0c6e0ecd2c70 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 and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Launchpad Janitor (janitor)]

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

[Gunnar Hjalmarsson (gunnarhj)]

This crash type is the most common on focal. However, it has been significantly less frequent lately.

Compare this:

https://errors.ubuntu.com/?release=Ubuntu%2020.04&package=ibus&from=2020-09-08&to=2020-09-15&version=1.5.22-2ubuntu2.1

with this:

https://errors.ubuntu.com/?release=Ubuntu%2020.04&package=ibus&from=2020-10-11&to=2020-10-18&version=1.5.22-2ubuntu2.1

The first one, from a week in September, reports 3771 occurrences, and the latest week there were 527 occurrences.

At September 15 the SRU in bug #1893551 was moved to focal-updates, i.e. we stopped letting im-config set "GTK_IM_MODULE=ibus" on GNOME desktops. I can't safely say that this correlation is not a coincidence; indeed there have been other SRUs which may have an impact. OTOH, if I look more closely at the last 10 crashes from the latest week, I see that in all those cases im-config was not yet upgraded to version 0.44-1ubuntu1.2, i.e. GTK_IM_MODULE was still set.

* Wondering about the users' package update habits *

So there is at least a strong indication that not setting "GTK_IM_MODULE=ibus" on GNOME helps a lot.

As regards groovy the number of total crashes is very low so far:

https://errors.ubuntu.com/?release=Ubuntu%2020.10&package=ibus&from=2020-10-11&to=2020-10-18

Several of those are from Budgie users, and I think there are issues with ibus on Budgie which need separate attention.