gnome-music crashes on startup

[Rob King]

On Cosmic Cuttlefish, gnome-music crashes on startup. This issue has been reported on Fedora already: https://bugzilla.redhat.com/show_bug.cgi?id=1635152

Additionally, the root cause appears to be an issue in GnuTLS: https://bugzilla.redhat.com/show_bug.cgi?id=1634736

Applying the patch listed there and rebuilding GnuTLS fixes the crash.

It is likely that this issue will affect any package using libsoup and/or libgnutls30.

The patch, for future reference:

```
diff --git a/lib/priority.c b/lib/priority.c
index 53c0d55..e727fcf 100644
--- a/lib/priority.c
+++ b/lib/priority.c
@@ -592,7 +592,9 @@ gnutls_priority_set(gnutls_session_t session, gnutls_priority_t priority)
  /* set the current version to the first in the chain.
   * This will be overridden later.
   */
- if (session->internals.priorities->protocol.algorithms > 0) {
+ if (session->internals.priorities->protocol.algorithms > 0 &&
+ !session->internals.handshake_in_progress &&
+ !session->internals.initial_negotiation_completed) {
   if (_gnutls_set_current_version(session,
          session->internals.priorities->
          protocol.priority[0]) < 0) {
```

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-music 3.30.1-1
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 23 11:21:16 2018
InstallationDate: Installed on 2018-10-14 (8 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180927)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-music
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "gnutls-3.6.4-fix-rehandshake.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Christopher (c-scharnagl)]

The bug is now fixed in gnutls-3.6.4 (on Disco Dingo).