FATAL EXIT — "Allocator failed to allocate" memory-pool crash, mid-game (Build 16.2.10604)

Age of Empires IV IV - Report a Bug
1

  • Build Number: 16.2.10604.0

  • Platform: Xbox / Microsoft Store (Game Pass PC version)

  • Operating System: Windows 11

Issue:

The game crashes to desktop mid-match with a FATAL EXIT. It happens roughly twice per play session and has been constant since April 2026 - I can’t finish ranked or multiplayer games. (New account, so I can’t attach files yet - pasting the relevant log lines inline below.)

The fatal crash (warnings.log):

RangeFixedBlockAllocator::Alloc (requested:312), (capacity:1434451968) pool 5 was full, trying next pool with larger blocksize(1024).
RangeFixedBlockAllocator::Alloc (requested:312), (capacity:1434451968) No pool had room for this allocation.
(F) Allocator failed to allocate:  requested(312), current usage(443890754), capacity(1673527296)
(F) -- FATAL EXIT --
Application crashed.

This looks identical to other reports - same requested(312) and the same capacity(1673527296) ceiling - so the internal fixed-block memory pool seems to exhaust regardless of system RAM (I have 64 GB).

Framerate visibly decays across the match right before the crash (warnings.log):

Local user framerate is [41.18]
Local user framerate is [40.59]
Local user framerate is [37.27]

Every crash is preceded by multi-second main-thread stalls / lock waits (LogFiles\unhandled.*.txt):

NetworkManager::DispatchEvents() - Warning - Time between calls was 5363 ms
SessionManager::Process() - Warning - Time between calls was 2480 ms, time waiting for lock was 2469 ms

Frequency: 11 crashes logged, roughly 2 per session: 2026-04-11 (x2), 04-18 (x2), 05-02 (x2), 05-03 (x2), 06-06 (x2), 06-14 (x1).

The game is correctly using the dedicated GPU (warnings.log), so this is not a wrong-GPU issue:

Chosen adapter: NVIDIA RTX PRO 2000 Blackwell Generation Laptop GPU
NVIDIA RTX PRO 2000 ... 7951MB dedicated video memory available
Vendor: NVIDIA (0x10DE)   Installed Driver Version: r595_00

System (well above spec, not a hardware limit):
CPU: Intel Core Ultra 9 285H / RAM: 64 GB
GPU: NVIDIA RTX PRO 2000 Blackwell Laptop, 8 GB VRAM, driver r595
OS: Windows 11