fa6f37c043
Turns out that redirecting a lot of output to the console can have some funny effects, like random kernel soft lockups. I spotted this in various CIs, but it remained almost entirely hidden thanks to `softlockup_panic=1`, until1a36d2672fwhich introduced a couple of tests that log quite a lot in a short amount of time. This, in combination with newer kernel version, which, for some reason, seem to be more susceptible to such soft lockups, made the Arch Linux jobs soft lockup quite a lot, see [0]. While debugging this I also noticed that runs which don't redirect stdout/stderr to the console are noticeably faster, e.g.: # TEST-71 nspawn + QEMU (KVM), StandardOutput=journal+console Elapsed (wall clock) time (h:mm:ss or m:ss): 0:24.64 # TEST-71 nspawn + QEMU (KVM), StandardOutput=journal Elapsed (wall clock) time (h:mm:ss or m:ss): 0:17.95 # TEST-71 nspawn + QEMU, StandardOutput=journal+console Elapsed (wall clock) time (h:mm:ss or m:ss): 2:04.70 # TEST-71 nspawn + QEMU, StandardOutput=journal Elapsed (wall clock) time (h:mm:ss or m:ss): 1:44.48 # TEST-04 QEMU, StandardOutput=journal+console Elapsed (wall clock) time (h:mm:ss or m:ss): 4:22.70 # TEST-04 QEMU, StandardOutput=console Elapsed (wall clock) time (h:mm:ss or m:ss): 5:04.67 Given all this, let's effectively revertba7abf79a5, and dump the testsuite-related journal messages only after the test finishes, so they don't go through the slow console. Resolves: systemd/systemd-centos-ci#660 [0] https://github.com/systemd/systemd-centos-ci/issues/660
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