This looks like an OOM kill: I’m on ~2 GiB RAM and in two-container rebuilds the old app + new build overlap pushes memory over the edge. Swap is already ~3 GiB used before bootstrap, so the ember build spike gets SIGKILL’d. Stopping the running container (or doing a one-container rebuild) avoids the overlap and succeeds. Next step is to confirm via dmesg and then either restart before rebuilds / investigate what’s driving swap up over time / add RAM (swap alone doesn’t seem to save it once it’s already heavily used).
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