Ubicloud

Ubicloud measured 92% schema accuracy on Kimi K2.6 tool calls with vLLM 0.28, about 2 failures in 25. Turning on constrained decoding explicitly brought it to 100% on the K2VV ToolCall benchmark.

The thread's pushback: the fix was a configuration, not a patch.

The mechanism: Postgres backends share memory segments, so an OOM kill of one can force the postmaster to terminate every backend at once. Ubicloud's answer is strict overcommit (vm.overcommit_memory=2): Linux refuses over-limit allocations with ENOMEM, and Postgres cancels just the offending transaction.

The thread splits. A commenter says the article describes the kernel's overcommit modes wrong and ignores oom_score_adj; the company's own co-founder concedes the framing was too strong.