On s390x this test fails when the SUT uses the z90crypt kernel module, as it's an another FD the test doesn't account for: /* test_rearrange_stdio */ Successfully forked off 'rearrange' as PID 57293. test_rearrange_stdio: r=0 /proc/57293/fd: total 0 lrwx------. 1 root root 64 Apr 5 06:18 0 -> /dev/pts/0 lrwx------. 1 root root 64 Apr 5 06:18 1 -> /dev/pts/0 lrwx------. 1 root root 64 Apr 5 06:18 2 -> /dev/pts/0 lrwx------. 1 root root 64 Apr 5 06:18 3 -> /dev/z90crypt rearrange terminated by signal ABRT. Debugging this was pain, since the child process didn't log anything once we closed stdout/stderr (for obvious reasons). Let's fix both issues by switching logging to kmsg once we close stdin/stdout/stderr, and also by making the test work fine when there are some extra FDs in the child's environment.
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