[Bug 1874824] Re: pgrep reports error "cannot allocate" when run without stack limit

[Luke Yeager]

FWIW, I was able to apply bb96fc4295 cleanly to the current 20.04
package (2:3.3.16-1ubuntu2) and it works for me.

apt-get -y source procps && cd procps-*
curl -fSsL -o debian/patches/sc_arg_max https://gitlab.com/procps-ng/procps/-/commit/bb96fc4295.patch
echo sc_arg_max >>debian/patches/series
dch --local myorg 'Apply patch: "pgrep: check sanity of SC_ARG_MAX"'
debuild -us -uc -G -i -tc

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https://bugs.launchpad.net/bugs/1874824

Title:
  pgrep reports error "cannot allocate" when run without stack limit

Status in procps package in Ubuntu:
  Triaged
Status in procps source package in Focal:
  Confirmed
Status in procps source package in Groovy:
  Confirmed
Status in procps source package in Hirsute:
  Triaged
Status in procps package in Debian:
  New

Bug description:
  If you have no stack limit (ulimit -S -s unlimited), any pgrep call
  will fail with an error:

  > pgrep vim
  pgrep: cannot allocate 4611686018427387903 bytes

  If you have a high stack limit (e.g. ulimit -S -s 500000), pgrep is
  very slow:

  > time pgrep vim
  2196
  real 8.48s user 8.40s syst 0.07s busy 99% rmem 253444

  The relevant upstream bug report could be: https://gitlab.com/procps-ng/procps/-/issues/152
  Archlinux bug report: https://bugs.archlinux.org/task/66093

  procps:
    Installed: 2:3.3.16-1ubuntu2
    500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

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