compiz: segfault at 0 ip af976f3d sp bfbd6ff0 error 4 in libunityshell.so (Disco)

Bug #1812964 reported by Khurshid Alam on 2019-01-23
16
This bug affects 2 people
Affects Status Importance Assigned to Milestone
unity (Ubuntu)
Undecided
Unassigned

Bug Description

Unityshell crashes when starting and screen goes back to unity greeter. This seems to happening after ccsm python3 port. Though downgrading compiz works, I suspect it is breaking when compiling against newer libraries.

Syslog doesn't really say much other than this:

compiz[7669]: Invalid MIT-MAGIC-COOKIE-1 key/usr/bin/compiz (core) - Fatal: Couldn't open display :0

unity-panel-service[7677]: Invalid MIT-MAGIC-COOKIE-1 keyUnable to init server: Could not connect: Connection refused

Log: https://paste.ubuntu.com/p/tZXCmYBQgy/

I try to get stacktrace running unity --advance-debug from tty in flashback metacity session, but I am getting "error debugging symbols" and it freezes after that.

Partial Trace: https://paste.ubuntu.com/p/hvmhbRVDP8/

Update:

1) It seems segfault occurs only on 32 bit on older version of intel (i915, 965).

2) On Ryzen DISPLAY is :1, manually setting it :0 works.

3) On 64 bit (all machines) user can't login first-time for every new user because of timeout error of unity7 service. 2nd time it logs in just fine. Time out error is most likely some regression with gsettings backend of compiz.

https://community.ubuntu.com/t/testing-unity-session-in-19-04/8451/166

OS: Ubuntu 19.04
Graphics: Intel n4200/GME 965/, Amd A10

Edit: Alberts Muktupāvels who authored ccsm python3 port confirmed it, so setting it as confirmed.

Changed in unity (Ubuntu):
status: New → Confirmed
description: updated
summary: compiz: segfault at 0 ip af976f3d sp bfbd6ff0 error 4 in
- libunityshell.so
+ libunityshell.so (Disco)
description: updated
description: updated
description: updated
description: updated
description: updated
description: updated
Khurshid Alam (khurshid-alam) wrote :

It seems I can no longer reproduce it after new compiz fixes and unity rebuild against that.

Changed in unity (Ubuntu):
status: Confirmed → Invalid
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