Some diagnosis as follows:
- Loaded a previous snapshot of a Kubuntu 21.04 VM from before 16th March 2021.
- Installed ubiquity.
- Tested whether ubiquity launches.
- Ubiquity launches.
- Then looked at what was upgradable in the release pocket.
- Sequentially upgraded likely culprits, rebooted, and tried to launch ubiquity
after each small update.
Result:
Found that upgrading Mesa packages from 20.3.4-1 to 21.0.0-1 is all that
is required to trigger the crash.
Upgraded the following packages:
libegl-mesa0 (20.3.4-1) to 21.0.0-1
libgbm1 (20.3.4-1) to 21.0.0-1
libgl1-mesa-dri (20.3.4-1) to 21.0.0-1
libglapi-mesa (20.3.4-1) to 21.0.0-1
libglx-mesa0 (20.3.4-1) to 21.0.0-1
libxatracker2 (20.3.4-1) to 21.0.0-1
mesa-va-drivers (20.3.4-1) to 21.0.0-1
mesa-vdpau-drivers (20.3.4-1) to 21.0.0-1
mesa-vulkan-drivers (20.3.4-1) to 21.0.0-1
** Also affects: ubiquity (Ubuntu Hirsute)
Importance: Critical
Status: New
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1920665
Title:
Ubiquity crash on try/install and from live session with "malloc():
unaligned tcache chunk detected"
Status in mesa package in Ubuntu:
New
Status in ubiquity package in Ubuntu:
New
Status in mesa source package in Hirsute:
New
Status in ubiquity source package in Hirsute:
New
Bug description:
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.11
ProcVersionSignature: Ubuntu 5.11.0-11.12-generic 5.11.0
Uname: Linux 5.11.0-11-generic x86_64
ApportVersion: 2.20.11-0ubuntu60
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.460
CurrentDesktop: KDE
Date: Sun Mar 21 11:53:44 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed
maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20210321)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)
Since approximately 16/03/2021 ubiquity from maybe-ubiquity (try
install screen) and from the live session is crashing on launch or
shortly after.
An example /var/log/installer/debug log from a session where both
crashes were triggered is below.
**** /var/log/installer/debug ****
Ubiquity 21.04.11
TEXT <small>If more than one person will use this computer, you can set up
multiple accounts after installation.</small>
TEXT <small>Enter the same password twice, so that it can be checked for
typing errors.</small>
TEXT <small>The name it uses when it talks to other computers.</small>
TEXT <small>Enter the same password twice, so that it can be checked for
typing errors.</small>
TEXT <small>Enter the same password twice, so that it can be checked for
typing errors.</small>
TEXT <small>If more than one person will use this computer, you can set up
multiple accounts after installation.</small>
TEXT <small>Enter the same password twice, so that it can be checked for
typing errors.</small>
TEXT <small>The name it uses when it talks to other computers.</small>
QSocketNotifier: Invalid socket 17 and type 'Read', disabling...
QSocketNotifier: Invalid socket 17 and type 'Write', disabling...
QSocketNotifier: Invalid socket 17 and type 'Exception', disabling...
Your console font configuration will be updated the next time your system
boots. If you want to update it now, run 'setupcon' from a virtual console.
update-initramfs is disabled since running on read-only media
debconf: DbDriver "passwords" warning: could not open
/var/cache/debconf/passwords.dat: Permission denied
munmap_chunk(): invalid pointer
Ubiquity 21.04.11
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kubuntu'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kubuntu'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kubuntu'
TEXT <small>If more than one person will use this computer, you can set up
multiple accounts after installation.</small>
TEXT <small>Enter the same password twice, so that it can be checked for
typing errors.</small>
TEXT <small>The name it uses when it talks to other computers.</small>
TEXT <small>Enter the same password twice, so that it can be checked for
typing errors.</small>
malloc(): unaligned tcache chunk detected
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