Jack clients have segmentation fault when trying to connect to jackd

[Len Ovens]

Steps to show this bug. Start jackd either as jackd or jackdbus (with jack_control). run jack_lsp from the command line to show jackd's port. Jack_lsp will segfault. Other jack clients will have similar problems. This is specific to jackd2 1.9.19, jackd 1.9.17 does not have this problem.

jackd 1.1.19 on ubuntu 20.04 does work but jackd 1.9.19 on 21.10 does not.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: jackd2 1.9.19~dfsg~ubuntu-0ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-lowlatency 5.11.21
Uname: Linux 5.11.0-20-lowlatency x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu67
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Thu Jul 22 18:09:18 2021
InstallationDate: Installed on 2021-06-15 (37 days ago)
InstallationMedia: Ubuntu-Studio 21.10 "Impish Indri" - Alpha amd64 (20210613)
SourcePackage: jackd2
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Erich Eickmeyer (eeickmeyer)]

Reported upstream: https://github.com/jackaudio/jack2/issues/776

[Erich Eickmeyer (eeickmeyer)]

Changed to critical as this is a blocking bug for Ubuntu Studio 21.10's release.

[Erich Eickmeyer (eeickmeyer)]

New information: Rebuilds of 1.9.17 and builds of 1.9.18 in impish result in the same issue, meaning there is likely a build-time dependency incompatibility. Upstream has been notified.

[Erich Eickmeyer (eeickmeyer)]

Unfortunately, all of this comes down to the forced LTO. Disabling this in d/rules, per upstream, fixes the problem. He had a few more notes as well. It seems as though the Debian package is doing some unnecessary gymnastics, so this is a decent divergence.

diff --git a/debian/rules b/debian/rules
index a36f71d..6f12983 100755
--- a/debian/rules
+++ b/debian/rules
@@ -1,8 +1,8 @@
 #!/usr/bin/make -f

 # Let's try to cut down noisy symbols to the official API
-export DEB_CFLAGS_MAINT_APPEND = -fvisibility=hidden
-export DEB_CXXFLAGS_MAINT_APPEND = -fvisibility=hidden
+export DEB_CFLAGS_MAINT_APPEND = -fvisibility=hidden -fno-lto
+export DEB_CXXFLAGS_MAINT_APPEND = -fvisibility=hidden -fno-lto

 -include /usr/share/cdbs/1/rules/upstream-tarball.mk
 -include /usr/share/cdbs/1/rules/utils.mk

[Launchpad Janitor (janitor)]

This bug was fixed in the package jackd2 - 1.9.19~dfsg~ubuntu-0ubuntu2

---------------
jackd2 (1.9.19~dfsg~ubuntu-0ubuntu2) impish; urgency=medium

  * Remove LTO in build (LP: #1937325)
  * Add new internal zalsa client

 -- Erich Eickmeyer <email address hidden> Sun, 01 Aug 2021 15:16:22 +0000