As for mawk 1.3.4 20150503, 
echo bacaa | mawk '{print match($0,/(a*)*/), RLENGTH}'
prints 
2 1
whereas GNU Awk 4.0.1,
echo bacaa | gawk '{print match($0,/(a*)*/), RLENGTH}'
prints 
1 0

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Touch seeded packages, which is subscribed to mawk in Ubuntu.
https://bugs.launchpad.net/bugs/1475968

Title:
  match function hangs

Status in mawk package in Ubuntu:
  New

Bug description:
  Testcase:
  mawk '{print match($0,/(a*)*/)}'
  hangs with any input. I expect it to print an integer number for each line in 
input and exit thereafter.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: mawk 1.3.3-17ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-57.95-lowlatency 3.13.11-ckt21
  Uname: Linux 3.13.0-57-lowlatency x86_64
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Jul 19 12:00:02 2015
  Dependencies:
   gcc-4.9-base 4.9.1-0ubuntu1
   libc6 2.19-0ubuntu6.6
   libgcc1 1:4.9.1-0ubuntu1
   multiarch-support 2.19-0ubuntu6.6
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-21 (301 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.1)
  SourcePackage: mawk
  UpgradeStatus: No upgrade log present (probably fresh install)

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