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

[Florian Weimer]

I believe this is related to the kind of NSS modules which are active on
the system. I believe it's related how the way errno is (not) set. I'm
not sure if this is a bug in the NSS framework, in the NSS module, or
simply a case of incorrect test expectations.

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https://bugs.launchpad.net/bugs/1869364

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

Status in glibc package in Ubuntu:
  New

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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