[Bug 1912652] Re: Upgrading libc6-lse breaks on systems it is in use

[Balint Reczey]

** Changed in: glibc (Ubuntu Groovy)
       Status: New => In Progress

** Description changed:

+ [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]
+ 
+  * 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.
+  * Install libc6-lse (again).
+  * Reboot
+  * Upgrade to the fixed libc6 package which Provides libc6-lse.
+  * The upgrade should succeed and automatically remove the libc6-lse package.
+  * Run the compiled a.c again and observe it running much faster than with the standard libc6 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.
+ 
+ [Other Info]
+ 
+ [Original Bug Text]
+ 
  Errors were encountered while processing:
-  /var/cache/apt/archives/libc6_2.32-0ubuntu3_arm64.deb
+  /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
+  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)

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https://bugs.launchpad.net/bugs/1912652

Title:
  Upgrading libc6-lse breaks on systems it is in use

Status in glibc package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in glibc source package in Bionic:
  New
Status in ubuntu-release-upgrader source package in Bionic:
  New
Status in glibc source package in Focal:
  In Progress
Status in ubuntu-release-upgrader source package in Focal:
  New
Status in glibc source package in Groovy:
  In Progress
Status in ubuntu-release-upgrader source package in Groovy:
  New
Status in glibc source package in Hirsute:
  Fix Released
Status in ubuntu-release-upgrader source package in Hirsute:
  Confirmed

Bug description:
  [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]

   * 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.
   * Install libc6-lse (again).
   * Reboot
   * Upgrade to the fixed libc6 package which Provides libc6-lse.
   * The upgrade should succeed and automatically remove the libc6-lse package.
   * Run the compiled a.c again and observe it running much faster than with the standard libc6 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.

  [Other Info]

  [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)

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