[Bug 1997093] Re: bash 5.2 regression too-aggressive optimizing of forks in an `eval' command inside a (command) subshell

[Frode Nordahl]

https://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=94d25f57f124a9b2268a3af0a0915871032f426e

** Summary changed:

- bash 5.2 regression in optimize_connection_fork
+ bash 5.2 regression too-aggressive optimizing of forks in an `eval' command inside a (command) subshell

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Title:
  bash 5.2 regression too-aggressive optimizing of forks in an `eval'
  command inside a (command) subshell

Status in bash package in Ubuntu:
  New
Status in ovn package in Ubuntu:
  New

Bug description:
  OVN makes use of GNU autotest for its testsuite. This in turn is a
  heavy user of bash.

  For some reason, when the 'ovn-controller incremental processing' test
  is executed using bash 5.2 on Debian experimental or Ubuntu
  Kinetic/Lunar, the `eval` [0] in the `counter_delta_` function
  misinterprets successful execution of commands [1], leading to a false
  negative for the 'ovn-controller incremental processing' test [2].

  Backporting the bash 5.1 package from Jammy, or compiling bash 5.1
  from upstream sources and rerunning the test makes it succeed.

  This does come across as a regression in bash.

  0: https://github.com/ovn-org/ovn/blob/a042aa23e79a0d36f1ce7b0ccfcf0a5995b045cd/tests/ovn-performance.at#L116
  1: https://github.com/ovn-org/ovn/blob/a042aa23e79a0d36f1ce7b0ccfcf0a5995b045cd/tests/ovn-performance.at#L479
  2: https://github.com/ovn-org/ovn/blob/a042aa23e79a0d36f1ce7b0ccfcf0a5995b045cd/tests/ovn-performance.at#L227

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