Upgrading libc6-lse breaks on systems it is in use

[Giovanni]

[Impact]

 * On arm64 systems supporting LSE and libc6-lse being installed an attempt to upgrade the package makes the upgrade fail and leave the system in an unusable state.
 * Performing a release upgrade on such arm64 systems also break if the libc6-lse package was installed and it is also present in the target release.

[Test Plan (Focal)]

 * Set up an 8 core LSE system such as one of the AWS Graviton2 instances.
 * If libc6-lse is installed, remove it.
 * Compile and run the a.c test program attached in LP: #1885012 and measure the run time a few times.
   gcc -O2 -o a.out a.c -lpthread -DITER=1000 -DTHREADS=64
 * Install libc6-lse (again).
 * Reboot
 * Upgrade to the fixed libc6 package which Provides libc6-lse.
 * The upgrade should succeed and remove the libc6-lse package.
 * Run the compiled a.c again and observe it running much faster than with the standard libc6 package.

[Test Plan (Groovy)]

 * Groovy's libc6 is already compiled with -moutline-atomics by default, thus there is no need to verify that.
 * Set up an LSE system such as one of the AWS Graviton2 instances.
 * Install libc6-lse if it is not installed.
 * Reboot
 * Upgrade to the fixed libc6 package which Provides libc6-lse.
 * The upgrade should succeed and automatically remove the libc6-lse package.

[Where problems could occur]

* The fix is compiling libc6 with -moutline-atomics which is in use instead of shipping the libc6-lse separate binary package. Should there be any GCC bug it could cause problems.

[Other Info (Focal)]

* The positive side effect of merging libc6-lse to libc6 and enabling optimization is that on capable HW the default libc6 will take advantage of the LSE instructions and improve the performance without requiring the installation of the additional libc libraries.

[Original Bug Text]

Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.32-0ubuntu3_arm64.deb
Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: libc6 2.31-0ubuntu9.1
ProcVersionSignature: Ubuntu 5.4.0-1035.37-aws 5.4.78
Uname: Linux 5.4.0-1035-aws aarch64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: arm64
CasperMD5CheckResult: skip
Date: Thu Jan 21 16:19:53 2021
Df:

Dmesg:

Ec2AMI: ami-0489277f0e9a94f8d
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: eu-central-1c
Ec2InstanceType: t4g.micro
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ErrorMessage: new libc6:arm64 package post-removal script subprocess returned error exit status 127
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.2
SourcePackage: glibc
Title: package libc6 2.31-0ubuntu9.1 failed to install/upgrade: new libc6:arm64 package post-removal script subprocess returned error exit status 127
UpgradeStatus: Upgraded to focal on 2021-01-21 (0 days ago)

[Balint Reczey (rbalint)]

Removing libc6-lse before the release upgrade resolves the issue.

Since the libc6-lse went away in hirsute anyway and ubuntu-release-upgrader updates are much easier and quicker than glibc ones I propose adding a quirk to remove libc6-lse before upgrades and possibly install it again if it is avaliable.

[Launchpad Janitor (janitor)]

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

[Balint Reczey (rbalint)]

Hirsute does not provide separate libc6-lse packages thus Groovy -> Hirsute upgrade is OK and Focal -> Hirusute (and later) upgrade will be OK as well when those get enabled.

[Balint Reczey (rbalint)]

In Bionic the fix for LP: #1885012 introduced the libc6-lse package and caused this upgrade issue.

[Balint Reczey (rbalint)]

The fixed version for Groovy is prepared in https://bileto.ubuntu.com/#/ticket/4512 and is waiting for the riscv64 build to finish.

[Łukasz Zemczak (sil2100)]

Hello Giovanni, or anyone else affected,

Accepted glibc into groovy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/glibc/2.32-0ubuntu3.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-groovy to verification-done-groovy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-groovy. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Łukasz Zemczak (sil2100)]

Hello Giovanni, or anyone else affected,

Accepted glibc into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted glibc (2.31-0ubuntu9.3) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

libgdata/0.17.12-1 (armhf)
ruby-grib/0.4.0-4build1 (s390x)
libclang-perl/0.09-4build8 (arm64)
dealer/20190529+ds-1 (ppc64el)
t-coffee/12.00.7fb08c2-4build1 (s390x)
xpra/3.0.6+dfsg1-1build1 (amd64)
makedumpfile/1:1.6.7-1ubuntu2.1 (amd64)
libepubgen/0.1.1-1ubuntu2 (arm64)
apt/2.0.5 (armhf)
pg-qualstats/1.0.9-1 (s390x)
booth/1.0-174-gce9f821-1 (amd64)
gnustep-base/1.26.0-7 (s390x)
fclib/3.0.0+dfsg-2build1 (arm64)
asterisk/1:16.2.1~dfsg-2ubuntu1 (amd64)
golang-github-grpc-ecosystem-grpc-gateway/1.6.4-2 (ppc64el, s390x)
puma/3.12.4-1ubuntu2 (s390x)
cmark-gfm/0.29.0.gfm.0-4 (amd64)
lua-nvim/0.2.1-1-1 (armhf)
saods9/8.1+repack-1 (amd64)
ruby-gpgme/2.0.19-3build1 (s390x)
ruby-bootsnap/1.4.6-1 (arm64)
staden-io-lib/1.14.11-6 (ppc64el)
s3ql/3.3.2+dfsg-1ubuntu1 (armhf)
mercurial/5.3.1-1ubuntu1 (amd64)
libterm-readline-gnu-perl/1.36-2build1 (ppc64el)
casper/1.445.1 (amd64)
datefudge/1.23ubuntu1 (armhf, ppc64el)
source-extractor/2.25.0+ds-2 (s390x)
smcroute/2.4.2-4 (arm64)
disulfinder/1.2.11-8build1 (arm64)
autofs/5.1.6-2ubuntu0.1 (ppc64el)
debconf-kde/1.0.3-3 (ppc64el)
libfastahack/1.0.0+dfsg-5build1 (ppc64el)
gemma/0.98.1+dfsg-1 (arm64)
missidentify/1.0-10 (ppc64el)
r-cran-systemfonts/0.1.1-1build1 (s390x)
bcalm/2.2.1-2build1 (ppc64el)
ipgrab/0.9.10-4 (ppc64el)
ruby-libxml/3.1.0-2 (s390x)
r-bioc-delayedarray/0.12.2+dfsg-1 (armhf)
netplan.io/0.101-0ubuntu3~20.04.2 (arm64)
6tunnel/1:0.13-1 (armhf)
taptempo/1.4.4-1 (s390x, armhf)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/focal/update_excuses.html#glibc

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted glibc (2.32-0ubuntu3.2) for groovy have finished running.
The following regressions have been reported in tests triggered by the package:

cyrus-imapd/3.2.3-2ubuntu1 (armhf)
pyqt5/5.15.0+dfsg-1 (s390x)
libsass/3.6.4-3 (s390x)
network-manager/1.26.2-1ubuntu1 (arm64)
reprotest/0.7.15 (s390x)
flatpak/1.8.2-1ubuntu0.1 (arm64)
puma/3.12.4-1ubuntu2 (arm64, s390x)
libtext-charwidth-perl/0.04-10 (ppc64el)
systemd/246.6-1ubuntu1.3 (arm64)
taptempo/1.4.5-1 (arm64)
uftrace/0.9.3-1ubuntu1 (arm64)
libgdata/0.17.12-1 (armhf)
cysignals/1.10.2+ds-4 (amd64)
hyphy/2.5.1+dfsg-3build1 (amd64)
glibc/2.32-0ubuntu3.2 (amd64)
libdate-simple-perl/3.0300-3 (arm64)
netplan.io/0.101-0ubuntu3~20.10.1 (amd64)
libastro-fits-cfitsio-perl/1.14-1 (ppc64el)
fwlogwatch/1.4-2 (arm64)
pandas/1.0.5+dfsg-3 (ppc64el, armhf, s390x, amd64, arm64)
rhonabwy/0.9.12-2build1 (s390x)
jailkit/2.21-2 (ppc64el)
openjdk-lts/11.0.10+9-0ubuntu1~20.10 (s390x)
dbus/1.12.20-1ubuntu1 (arm64)
pymca/5.5.5+dfsg-2build2 (arm64)
euslisp/9.27+dfsg-6 (armhf, amd64)
libflame/5.2.0-2 (amd64)
samtools/1.10-4 (arm64)
syncthing/1.10.0~ds1-1 (amd64, s390x)
endlessh/1.1-4 (armhf)
r-cran-amore/0.2-16-1build1 (ppc64el)
crrcsim/0.9.13-3.2build1 (ppc64el)
samplv1/0.9.17-1 (ppc64el)
hugo/0.74.3-1 (armhf)
libcsfml/2.5-1build1 (ppc64el)
firefox/87.0+build3-0ubuntu0.20.10.1 (armhf)
etcd/3.2.26+dfsg-8 (amd64)
libnxml/0.18.3-8 (s390x)
google-osconfig-agent/20210219.00-0ubuntu1~20.10.0 (armhf)
combblas/1.6.2-5build1 (arm64)
libbio-db-hts-perl/3.01-3 (amd64)
libterm-readkey-perl/2.38-1build1 (s390x)
ruby2.7/2.7.1-3ubuntu1.2 (armhf)
hkl/5.0.0.2620-1build1 (ppc64el)
liblinux-inotify2-perl/1:2.2-2 (ppc64el)
datefudge/1.24 (ppc64el)
libpgplot-perl/1:2.24-1build1 (s390x)
healpy/1.14.0-1 (arm64)
udisks2/2.9.1-2ubuntu1 (amd64)
kopanocore/8.7.0-7ubuntu4 (arm64)
gyoto/1.4.4-3build1 (s390x)
cpdb-libs/1.2.0-0ubuntu8 (armhf)
ruby-concurrent/1.1.6+dfsg-3 (amd64)
postgis/3.0.2+dfsg-2ubuntu2 (armhf)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/groovy/update_excuses.html#glibc

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[Balint Reczey (rbalint)]

Verified glibc 2.31-0ubuntu9.3 on Focal.

root@ff-lp1912652:~# gcc -O2 -o a.out a.c -lpthread -DITER=1000 -DTHREADS=64
root@ff-lp1912652:~# time ./a.out
thread 0: min=128, max=390014464, average=15175.931641, mutexes_locked=224170, flips=12
...
thread 63: min=128, max=212314560, average=31851.539062, mutexes_locked=105648, flips=1
server: min=128, max=249241888, average=581391.875000, mutexes_locked=6158, flips=1000

real 0m0.938s
user 0m7.363s
sys 0m0.064s
root@ff-lp1912652:~# apt install libc6-lse
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  libc6-lse
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 1035 kB of archives.
After this operation, 3244 kB of additional disk space will be used.
Get:1 http://ports.ubuntu.com/ubuntu-ports focal-updates/main arm64 libc6-lse arm64 2.31-0ubuntu9.2 [1035 kB]
Fetched 1035 kB in 1s (1393 kB/s)
Selecting previously unselected package libc6-lse:arm64.
(Reading database ... 35769 files and directories currently installed.)
Preparing to unpack .../libc6-lse_2.31-0ubuntu9.2_arm64.deb ...
Unpacking libc6-lse:arm64 (2.31-0ubuntu9.2) ...
Setting up libc6-lse:arm64 (2.31-0ubuntu9.2) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
root@ff-lp1912652:~# reboot

Session terminated, killing shell... ...killed.
ubuntu@ip-172-31-20-158:~$ lxc shell ff-lp1912652
root@ff-lp1912652:~# time ./a.out
thread 0: min=128, max=1119296, average=20925.992188, mutexes_locked=1371, flips=36
...thread 61: min=128, max=15716704, average=295146.343750, mutexes_locked=96, flips=0
thread 62: min=1000000, max=12458848, average=12458848.000000, mutexes_locked=1, flips=0
thread 63: min=128, max=9601760, average=27332.921875, mutexes_locked=1255, flips=9
server: min=128, max=5040224, average=19802.298828, mutexes_locked=1437, flips=1000

real 0m0.014s
user 0m0.023s
sys 0m0.059s
root@ff-lp1912652:~# apt install libc-bin libc-dev-bin libc6 libc6-dev locales
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  glibc-doc
The following packages will be REMOVED:
  libc6-lse
The following packages will be upgraded:
  libc-bin libc-dev-bin libc6 libc6-dev locales
5 upgraded, 0 newly installed, 1 to remove and 12 not upgraded.
Need to get 8770 kB of archives.
After this operation, 3159 kB disk space will be freed.
Do you want to continue? [Y/n]
Get:1 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 libc6-dev arm64 2.31-0ubuntu9.3 [2068 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 libc-dev-bin arm64 2.31-0ubuntu9.3 [64.2 kB]
Get:3 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 libc6 arm64 2.31-0ubuntu9.3 [2270 kB]
Get:4 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 locales all 2.31-0ubuntu9.3 [3862 kB]
Get:5 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 libc-bin arm64 2.31-0ubuntu9.3 [506 kB]
Fetched 8770 kB in 1s (7065 kB/s)
Preconfiguring packages ...
(Reading database ... 35813 files and directories currently installed.)
Removing libc6-lse:arm64 (2.31-0ub...

[Launchpad Janitor (janitor)]

This bug was fixed in the package glibc - 2.31-0ubuntu9.3

---------------
glibc (2.31-0ubuntu9.3) focal; urgency=medium

  [ Aurelien Jarno ]
  * debian/patches/any/git-surplus-tls-accounting.diff: backport TLS surplus
    accounting from upstream. (Closes: #964141) (LP: #1914044)

  [ Balint Reczey ]
  * Update debian/patches/ubuntu/local-disable-ld_audit.diff
  * Prevent rare deadlock in pthread_cond_signal (LP: #1899800)
  * Cherry-pick upstream patch to fix building with -moutline-atomics
  * Make libc6 provide libc6-lse on arm64.
    Libc6 is now compiled with -moutline-atomics thus the separate binary
    package is dropped. (LP: #1912652)
  * debian/control: Libc6 should Conflict and Replace libc6-lse

 -- Balint Reczey <email address hidden> Mon, 29 Mar 2021 22:11:32 +0200

[Łukasz Zemczak (sil2100)]

The verification of the Stable Release Update for glibc has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Balint Reczey (rbalint)]

With releasing the fix for Focal (20.04) the release upgrades from Bionic (18.04) are also fixed.

Upgrades to a newer libc6-lse version in Bionic would still crash, but there is no newer official libc6-lse package for Bionic.

[Balint Reczey (rbalint)]

The fixed version has been moved back to focal-proposed due to regressions caused by LP: #1914044.

[Launchpad Janitor (janitor)]

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

[Balint Reczey (rbalint)]

I've copied 2.31-0ubuntu9.3 to https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4547 until the new update can be released including this fix.

[Juan Pedro Paredes (juampe)]

With https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1912652/comments/20 I can now upgrade to groovy and hirsute in arm64, Thanks!

[Brian Murray (brian-murray)]

Hello Giovanni, or anyone else affected,

Accepted glibc into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.8 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted glibc (2.31-0ubuntu9.8) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

ruby-stackprof/0.2.15-2 (arm64)
sphinxbase/0.8+5prealpha+1-8 (armhf)
r-cran-ps/1.3.2-2 (s390x)
linux-hwe-5.13/5.13.0-37.42~20.04.1 (armhf)
mercurial/5.3.1-1ubuntu1 (armhf, ppc64el)
linux-hwe-5.11/5.11.0-61.61 (armhf)
mbedtls/2.16.4-1ubuntu2 (s390x)
libreoffice/1:6.4.7-0ubuntu0.20.04.4 (armhf)
ruby-ferret/0.11.8.7-2 (amd64)
cross-toolchain-base/43ubuntu3.1 (ppc64el)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/focal/update_excuses.html#glibc

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[Steve Langasek (vorlon)]

Hello Giovanni, or anyone else affected,

Accepted glibc into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.9 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted glibc (2.31-0ubuntu9.9) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

hilive/2.0a-3build2 (arm64)
tomb/2.7+dfsg2-1 (arm64)
linux-hwe-5.13/5.13.0-40.45~20.04.1 (armhf)
bali-phy/3.4.1+dfsg-2build1 (s390x, arm64)
smalt/0.7.6-9 (ppc64el)
mariadb-10.3/1:10.3.34-0ubuntu0.20.04.1 (armhf)
feersum/1.407-2 (s390x)
kopanocore/8.7.0-7ubuntu1 (amd64)
r-cran-ps/1.3.2-2 (s390x, ppc64el)
libreoffice/1:6.4.7-0ubuntu0.20.04.4 (amd64)
imagemagick/8:6.9.10.23+dfsg-2.1ubuntu11.4 (armhf)
ruby-stackprof/0.2.15-2 (amd64)
gnome-photos/3.34.1-1 (ppc64el)
linux-azure-5.11/5.11.0-1029.32~20.04.2 (amd64)
linux-intel-5.13/5.13.0-1010.10 (amd64)
php-luasandbox/3.0.3-2build2 (armhf, arm64)
mbedtls/2.16.4-1ubuntu2 (amd64, ppc64el)
cross-toolchain-base/43ubuntu3.1 (ppc64el)
rtags/2.37-1 (amd64)
gvfs/1.44.1-1ubuntu1 (arm64, ppc64el)
linux-oem-5.14/5.14.0-1033.36 (amd64)
linux-azure-cvm/5.4.0-1076.79+cvm1 (amd64)
mercurial/5.3.1-1ubuntu1 (armhf)
r-cran-satellite/1.0.2-1build1 (armhf)
s3ql/3.3.2+dfsg-1ubuntu1 (armhf)
snapd/2.54.3+20.04.1ubuntu0.2 (s390x, arm64, amd64, ppc64el)
sphinxbase/0.8+5prealpha+1-8 (armhf)
gemma/0.98.1+dfsg-1 (armhf)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/focal/update_excuses.html#glibc

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[Michael Hudson-Doyle (mwhudson)]

I verified that arm64 systems with and without libc6-lse installed upgrade to the new version of glibc in proposed smoothly.

[Launchpad Janitor (janitor)]

This bug was fixed in the package glibc - 2.31-0ubuntu9.9

---------------
glibc (2.31-0ubuntu9.9) focal; urgency=medium

  * Disable testsuite on riscv64. It is failing maths tests intermittently in
    ways that cannot be a glibc regression and is disabled in later series
    anyway.

glibc (2.31-0ubuntu9.8) focal; urgency=medium

  * Update for 20.04. (LP: #1951033)

  [ Balint Reczey ]
  * Cherry-pick upstream patch to fix building with -moutline-atomics
  * Prevent rare deadlock in pthread_cond_signal (LP: #1899800)

  [ Matthias Klose ]
  * Revert: Use DH_COMPAT=8 for dh_strip to fix debug sections for valgrind.
    Enables debugging ld.so related issues. (LP: #1918035)
  * Don't strip ld.so on armhf. (LP: #1927192)

  [ Gunnar Hjalmarsson ]
  * d/local/usr_sbin/update-locale: improve sanity checks. (LP: #1892825)

  [ Heitor Alves de Siqueira ]
  * d/p/u/git-lp1928508-reversing-calculation-of-__x86_shared_non_temporal.patch:
    - Fix memcpy() performance regression on x86 AMD systems (LP: #1928508)

  [ Aurelien Jarno ]
  * debian/debhelper.in/libc.preinst: drop the check for kernel release
    > 255 now that glibc and preinstall script are fixed. (LP: #1962225)

  [ Michael Hudson-Doyle ]
  * libc6 on arm64 is now built with -moutline-atomics so libc6-lse can now be
    an empty package that is safe to remove. (LP: #1912652)
  * d/patches/u/aarch64-memcpy-improvements.patch: Backport memcpy
    improvements. (LP: #1951032)
  * Add test-float64x-yn to xfails on riscv64.

 -- Michael Hudson-Doyle <email address hidden> Thu, 07 Apr 2022 13:24:41 +1200