glibc 2.27-3ubuntu1.3 ADT test failure with linux 4.15.0-119.120

[Stefan Bader]

Testing failed on:
    armhf: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/armhf/g/glibc/20200930_011321_6b874@/log.gz
    armhf+: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/armhf/g/glibc/20200929_030046_0d91d@/log.gz

The failed test (tst-support_descriptors) appears to be new in the proposed version of glibc. Armhf seems to be the only arch failing. I did not see the test being mentioned in the runs for the current version of glibc (which fails for a different part).

[Stefan Bader (smb)]

FAIL: support/tst-support_descriptors
original exit status 1
info: initial descriptor set
info: 0: target="pipe:[58968719]" major=0 minor=12 ino=58968719
info: 1: target="/tmp/autopkgtest.3cYFKQ/build.QRa/src/build-tree/armhf-armel/support/tst-support_descriptors.out" major=0 minor=47 ino=141349255
info: 2: target="pipe:[58970199]" major=0 minor=12 ino=58970199
info: 6: target="pipe:[58968722]" major=0 minor=12 ino=58968722
info: 21: target="socket:[14949]" major=0 minor=9 ino=14949
info: 22: target="socket:[17490]" major=0 minor=9 ino=17490
info: 62: target="pipe:[58970203]" major=0 minor=12 ino=58970203
info: 63: target="pipe:[58970199]" major=0 minor=12 ino=58970199
info: descriptor set with additional free descriptor
info: 0: target="pipe:[58968719]" major=0 minor=12 ino=58968719
info: 1: target="/tmp/autopkgtest.3cYFKQ/build.QRa/src/build-tree/armhf-armel/support/tst-support_descriptors.out" major=0 minor=47 ino=141349255
info: 2: target="pipe:[58970199]" major=0 minor=12 ino=58970199
info: 3: target="/dev/null" major=0 minor=6 ino=7
info: 6: target="pipe:[58968722]" major=0 minor=12 ino=58968722
info: 21: target="socket:[14949]" major=0 minor=9 ino=14949
info: 22: target="socket:[17490]" major=0 minor=9 ino=17490
info: 62: target="pipe:[58970203]" major=0 minor=12 ino=58970203
info: 63: target="pipe:[58970199]" major=0 minor=12 ino=58970199
info: BEGIN subprocess_closed_descriptor output
error: Differences found in descriptor set
Reference descriptor set:
  0: target="pipe:[58968719]" major=0 minor=12 ino=58968719
  1: target="pipe:[59270604]" major=0 minor=12 ino=59270604
  2: target="pipe:[59270605]" major=0 minor=12 ino=59270605
  3: target="/dev/null" major=0 minor=6 ino=7
  6: target="pipe:[58968722]" major=0 minor=12 ino=58968722
  21: target="socket:[14949]" major=0 minor=9 ino=14949
  22: target="socket:[17490]" major=0 minor=9 ino=17490
  62: target="pipe:[58970203]" major=0 minor=12 ino=58970203
  63: target="pipe:[58970199]" major=0 minor=12 ino=58970199
Current descriptor set:
  0: target="pipe:[58968719]" major=0 minor=12 ino=58968719
  1: target="pipe:[59270604]" major=0 minor=12 ino=59270604
  2: target="pipe:[59270605]" major=0 minor=12 ino=59270605
  6: target="pipe:[58968722]" major=0 minor=12 ino=58968722
  21: target="socket:[14949]" major=0 minor=9 ino=14949
  22: target="socket:[17490]" major=0 minor=9 ino=17490
  62: target="pipe:[58970203]" major=0 minor=12 ino=58970203
  63: target="pipe:[58970199]" major=0 minor=12 ino=58970199
Differences:
error: descriptor 3 was closed
EOT
info: END subprocess_closed_descriptor output
info: BEGIN subprocess_opened_descriptor output
error: Differences found in descriptor set
Reference descriptor set:
  0: target="pipe:[58968719]" major=0 minor=12 ino=58968719
  1: target="pipe:[59273319]" major=0 minor=12 ino=59273319
  2: target="pipe:[59273320]" major=0 minor=12 ino=59273320
  6: target="pipe:[58968722]" major=0 minor=12 ino=58968722
  21: target="socket:[14949]" major=0 minor=9 ino=14949
  22: target="socket:[17490]" major=0 minor=9 ino=17490
  62: target="pipe:[58970203]" major=0 minor=12 ino=58970203
  63: target="pipe:[58970199]" major=0 minor=12 ino=589...