[Bug 1997475] Re: FTBFS: tests fail on s390x due to incorrect regexp on /proc/cpuinfo

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** Changed in: git (Debian)
       Status: Unknown => New

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Title:
  FTBFS: tests fail on s390x due to incorrect regexp on /proc/cpuinfo

Status in git package in Ubuntu:
  In Progress
Status in git package in Debian:
  New

Bug description:
  git commit 29fb2ec384a867ca577335a12f4b45c184e7b642, present in 2.38.0
  and later, introduced a function that gets the number of cores from
  /proc/cpuinfo. It essentially does this:

      do { local @ARGV='/proc/cpuinfo'; return
  scalar(grep(/^processor\s*:/, <>)); } if -r '/proc/cpuinfo';

  On s390x, the ^processor lines are like this:

  processor 0: version = FF,  identification = 148F67,  machine = 2964

  In other arches (I checked amd64, armhf and arm64), they are like this
  instead:

  processor       : 0

  As a result, that function is returning 0 on s390x, and that value is
  used for the number of jobs the script should execute. Since it's
  zero, it exits without doing anything, and that breaks the test and
  the build[3] on s390x.

  1. https://github.com/git/git/commit/29fb2ec384a867ca577335a12f4b45c184e7b642
  2. https://github.com/git/git/commit/29fb2ec384a867ca577335a12f4b45c184e7b642#diff-e7042d714d4be11a06d153e6f2daeb3c3a9766b972522baab8ba113b962086cfR574
  3. https://launchpadlibrarian.net/635348769/buildlog_ubuntu-lunar-s390x.git_1%3A2.38.1-1ubuntu1_BUILDING.txt.gz

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