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This avoids the test harness being terminated like: make[1]: *** [Makefile:24419: check-recursive] Hangup make[3]: *** [Makefile:24668: check-TESTS] Hangup make: *** [Makefile:24922: check] Hangup make[2]: *** [Makefile:24920: check-am] Hangup make[4]: *** [Makefile:24685: tests/misc/usage_vs_refs.log] Error 129 ... This happened sometimes when the tests were being run non interactively. For example when run like: setsid make TESTS="tests/timeout/timeout.sh \ tests/tail/overlay-headers.sh" SUBDIRS=. -j2 check Note the race window can be made bigger by adding a sleep after tail is stopped in overlay-headers.sh The race can trigger the kernel to induce its job control mechanism to prevent stuck processes. I.e. where it sends SIGHUP + SIGCONT to a process group when it determines that group may become orphaned, and there are stopped processes in that group. * tests/tail/overlay-headers.sh: Use setsid(1) to keep the stopped tail process in a separate process group, thus avoiding any kernel job control protection mechanism. * tests/timeout/timeout.sh: Use setsid(1) to avoid the kernel checking the main process group when sleep(1) is reparented. Fixes https://bugs.gnu.org/80477