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While syncing our timezone code with IANA's updates in commit 1c1a7cbd6, I'd chosen not to adopt the code they conditionally compile under #ifdef ALL_STATE. The main thing that that drives is that the space for gmtime and localtime timezone definitions isn't statically allocated, but is malloc'd on first use. I reasoned we didn't need that logic: we don't have localtime() at all, and we always initialize TimeZone to GMT so we always need that one. But there is one other thing ALL_STATE does, which is to make tzload() malloc its transient workspace instead of just declaring it as a local variable. It turns out that that local variable occupies 78K. Even worse is that, at least for common US timezone settings, there's a recursive call to parse the "posixrules" zone name, making peak stack consumption to select a time zone upwards of 150K. That's an uncomfortably large fraction of our STACK_DEPTH_SLOP safety margin, and could result in outright crashes if we try to reduce STACK_DEPTH_SLOP as has been discussed recently. Furthermore, this means that the postmaster's peak stack consumption is several times that of a backend running typical queries (since, except on Windows, backends inherit the timezone GUC values and don't ever run this code themselves unless you do SET TIMEZONE). That's completely backwards from a safety perspective. Hence, adopt the ALL_STATE rather than non-ALL_STATE variant of tzload(), while not changing the other code aspects that symbol controls. The risk of an ENOMEM error from malloc() seems less than that of a SIGSEGV from stack overrun. This should probably get back-patched along with 1c1a7cbd6 and followon fixes, whenever we decide we have enough confidence in the updates to do that.
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