Hi Michael, Steven, and Ranier, > Anyway, couldn't we flip the order of the operations in pgstat_init_entry() so as we do first an allocation and avoid any inconsistency in the shared state?
The issue is not only in pgstat_init_entry(). Currently it errors on OOM but this doesn't prevent us from calling pgstat_lock_entry() through pgstat_get_entry_ref() which accesses a non-initialized lock. Here's the second version of the patch. Now we remove inserted hash entry on OOM which would prevent accessing the entry
0002-fix-sshashent-access-segfault-when-it-s-half-initial.patch
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