[Bug 1869364] Re: glibc pwd/test-getpw test failures in autopkgtest

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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Title:
  glibc pwd/test-getpw test failures in autopkgtest

Status in glibc package in Ubuntu:
  In Progress
Status in glibc source package in Groovy:
  In Progress

Bug description:
  I started seeing this in the testing for 5.4.0-20. Only happening on
  arm64/armhf.

  ----------
  FAIL: pwd/tst-getpw
  original exit status 223
  PASS: NULL buffer returns -1 and sets errno to EINVAL.
  PASS: Read a password line given a uid.
  FAIL: Did not find even one invalid uid.
  ----------

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/arm64/g/glibc/20200326_165114_2fcf9@/log.gz
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/armhf/g/glibc/20200326_173356_3378d@/log.gz

  I've unsuccessfully tried to reproduce this on an arm64 host (by
  running this test case standalone, not the full test suite), so
  possibly there's something about the autopkgtest environment. This
  also happens with the 5.4.0-18 from focal-release, so it does not
  appear to be a regression in the kernel.

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-focal/focal/arm64/g/glibc/20200326_224201_5fd33@/log.gz

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