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## Problem In `test_basebackup_with_high_slru_count`, the pageserver is sometimes mysteriously hanging on startup, having been started+stopped earlier in the test setup while populating template tenant data. - #7586 We can't see why this is hanging in this particular test. The test does some weird stuff though, like attaching a load of broken tenants and then doing a SIGQUIT kill of a pageserver. ## Summary of changes - Attach tenants normally instead of doing a failpoint dance to attach them as broken - Shut the pageserver down gracefully during init instead of using immediate mode - Remove the "sequential" variant of the unstable test, as this is going away soon anyway - Log before trying to acquire lock file, so that if it hangs we have a clearer sense of if that's really where it's hanging. It seems like it is, but that code does a non-blocking flock so it's surprising.