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[Core] Drain in-flight kernels before cuMemUnmap in CuMemAllocator.sleep (fixes Xid-31 sleep-side race under async scheduling)#45615

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[Core] Drain in-flight kernels before cuMemUnmap in CuMemAllocator.sleep (fixes Xid-31 sleep-side race under async scheduling)#45615
terafin wants to merge 1 commit into
vllm-project:mainfrom
intarweb:fix/cumem-sleep-drain-kernels

[Core] Drain in-flight kernels before cuMemUnmap in CuMemAllocator.sleep

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