[Bug 1941963] [NEW] package shim-signed 1.40.7+15.4-0ubuntu9 failed to install/upgrade: kernel segfault. Hard lock

[spec]

Public bug reported:

Ubuntu-Studio 20.04.3 LTS on MacPro 5,1, dual W3520
>From /proc/version: Linux version 5.11.0-27-lowlatency (buildd at lcy01-amd64-019) (gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #29~20.04.1-Ubuntu SMP PREEMPT Wed Aug 11 17:06:56 UTC 2021

# apt-cache policy shim-signed
shim-signed:
  Installed: 1.40.7+15.4-0ubuntu9
  Candidate: 1.40.7+15.4-0ubuntu9
  Version table:
 *** 1.40.7+15.4-0ubuntu9 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.40.3+15+1533136590.3beb971-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

>What you expected to happen

Running `apt upgrade` would complete without issue.

>What happened instead

System hard lock, becomes completely unresponsive both from the local
terminal and over established SSH. Eventually memory is exhausted and
the machine reboots.

Upon restart, running `apt upgrade` returns the error: "E: dpkg was
interrupted, you must manually run 'dpkg --configure -a' to correct the
problem."

Running `dpkg --configure -a` attempts to complete installation of shim-
signed, segfaults, requiring a cold boot.

Only a fraction of the errors generated get written to the logs before
the crash as the crash prevents a final flush to disk. From a remote
machine I tailed several logs and triggered the crash again, then copied
the results from the terminal and attached to report.

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Output of `tail -f dpkg.log syslog kern.log ` while running `dpkg --configure -a` from another terminal"
   https://bugs.launchpad.net/bugs/1941963/+attachment/5521362/+files/specOBS_crash

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https://bugs.launchpad.net/bugs/1941963

Title:
  package shim-signed 1.40.7+15.4-0ubuntu9 failed to install/upgrade:
  kernel segfault. Hard lock

Status in shim-signed package in Ubuntu:
  New

Bug description:
  Ubuntu-Studio 20.04.3 LTS on MacPro 5,1, dual W3520
  From /proc/version: Linux version 5.11.0-27-lowlatency (buildd at lcy01-amd64-019) (gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #29~20.04.1-Ubuntu SMP PREEMPT Wed Aug 11 17:06:56 UTC 2021

  # apt-cache policy shim-signed
  shim-signed:
    Installed: 1.40.7+15.4-0ubuntu9
    Candidate: 1.40.7+15.4-0ubuntu9
    Version table:
   *** 1.40.7+15.4-0ubuntu9 500
          500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.40.3+15+1533136590.3beb971-0ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

  >What you expected to happen

  Running `apt upgrade` would complete without issue.

  >What happened instead

  System hard lock, becomes completely unresponsive both from the local
  terminal and over established SSH. Eventually memory is exhausted and
  the machine reboots.

  Upon restart, running `apt upgrade` returns the error: "E: dpkg was
  interrupted, you must manually run 'dpkg --configure -a' to correct
  the problem."

  Running `dpkg --configure -a` attempts to complete installation of
  shim-signed, segfaults, requiring a cold boot.

  Only a fraction of the errors generated get written to the logs before
  the crash as the crash prevents a final flush to disk. From a remote
  machine I tailed several logs and triggered the crash again, then
  copied the results from the terminal and attached to report.

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