[Bug 1983100] [NEW] dotnet build intermittently crashes with segfault on Ubuntu 18.04

[Nicolas Bock]

Public bug reported:

Bionic's OpenSSL 1.1.1 package
(https://launchpad.net/ubuntu/bionic/+source/openssl) is the only
version of openssl 1.1.1 on any distro that we've encountered that does
not have support for the OPENSSL_NO_ATEXIT functionality from 1.1.1b
(openssl/openssl at c2b3db2).

The threading model in .NET has the possibility that background threads
are still running when exit() is called, which can cause SIGSEGV if a
background thread interacts with OpenSSL after/while it has unloaded.
For that reason, we always initialize OpenSSL 1.1.1 with the
OPENSSL_NO_ATEXIT flag (which, of all the distros we run on only has no
effect on Bionic).

We feel that the stability of applications on Ubuntu 18.04 would be
improved if the functionality of OPENSSL_NO_ATEXIT was merged into the
bionic openssl 1.1.1 package, even if the constant isn't published into
the header for the dev package.

Context:
https://github.com/dotnet/runtime/issues/48411#issuecomment-1178405101

** Affects: openssl (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: openssl (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: openssl (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1983100

Title:
  dotnet build intermittently crashes with segfault on Ubuntu 18.04

Status in openssl package in Ubuntu:
  New
Status in openssl source package in Bionic:
  New

Bug description:
  Bionic's OpenSSL 1.1.1 package
  (https://launchpad.net/ubuntu/bionic/+source/openssl) is the only
  version of openssl 1.1.1 on any distro that we've encountered that
  does not have support for the OPENSSL_NO_ATEXIT functionality from
  1.1.1b (openssl/openssl at c2b3db2).

  The threading model in .NET has the possibility that background
  threads are still running when exit() is called, which can cause
  SIGSEGV if a background thread interacts with OpenSSL after/while it
  has unloaded. For that reason, we always initialize OpenSSL 1.1.1 with
  the OPENSSL_NO_ATEXIT flag (which, of all the distros we run on only
  has no effect on Bionic).

  We feel that the stability of applications on Ubuntu 18.04 would be
  improved if the functionality of OPENSSL_NO_ATEXIT was merged into the
  bionic openssl 1.1.1 package, even if the constant isn't published
  into the header for the dev package.

  Context:
  https://github.com/dotnet/runtime/issues/48411#issuecomment-1178405101

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