25.3.5 Backport of #79147: Remove guard pages from fibers and alternative stack for signals in threads #893
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Better guard pages with MADV_GUARD_INSTALL/MADV_GUARD_REMOVE (linux 6.13+)
…ack-protection stack allocation in Fiber and alternative stack for signals
…-alt-thread fix ThreadStack::getSize
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Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):
Remove guard pages for threads and async_socket_for_remote/use_hedge_requests. Change the allocation method in
FiberStackfrommmaptoaligned_alloc. Since this splits VMAs and under heavy load vm.max_map_count can be reached. (ClickHouse#78423 by @azat, ClickHouse#79147 and ClickHouse#79533 by @CheSema)Documentation entry for user-facing changes