On a GNU/Hurd from 2019, I observe one hanging test:
FAIL: tests/du/8gb (after I killed the hanging process)
and 6 test failures:
FAIL: tests/misc/env-S
FAIL: tests/misc/kill
FAIL: tests/misc/nice
FAIL: tests/split/fail
FAIL: tests/cp/parent-perm-race
FAIL: tests/dd/stats
Find the log attached.
In the test that hangs, the command
dd bs=1 seek=8G of=big < /dev/null 2> /dev/null
produced a file that is 8 GiB (= 8589934592 bytes) large.
Adding a 'count=1' argument does not help:
dd bs=1 seek=8G of=big count=1 < /dev/null
or even
dd bs=1 seek=8G of=big count=0 < /dev/null
hangs as well.