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fix(cache): move ongoing_prefetch pop after validation to prevent leak (#9927)

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Co-authored-by: Zhiqiang Xie <xiezhq@stanford.edu>
This commit is contained in:
JinYan Su
2025-09-03 10:39:34 +08:00
committed by GitHub
parent 6243c36702
commit 37565b7f21
1 changed files with 5 additions and 5 deletions
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10
python/sglang/srt/mem_cache/hiradix_cache.py
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@@ -468,9 +468,9 @@ class HiRadixCache(RadixCache):
# todo: more policies for prefetch progress such as timeout
# the current policy is to prefetch with best effort and terminate when queuing is over
last_host_node, token_ids, host_indices, operation = self.ongoing_prefetch.pop(
last_host_node, token_ids, host_indices, operation = self.ongoing_prefetch[
req_id
)
]
if operation.host_indices is None:
# prefetch has not been issued due to insufficient host memory
@@ -512,6 +512,7 @@ class HiRadixCache(RadixCache):
host_indices[min_completed_tokens:completed_tokens]
)
last_host_node.release_host()
del self.ongoing_prefetch[req_id]
self.cache_controller.prefetch_tokens_occupied -= len(token_ids)
return True
@@ -775,9 +776,7 @@ class HiRadixCache(RadixCache):
if rid not in self.ongoing_prefetch:
return
last_host_node, token_ids, host_indices, operation = self.ongoing_prefetch.pop(
rid
)
last_host_node, token_ids, host_indices, operation = self.ongoing_prefetch[rid]
if operation.host_indices is None:
return
@@ -785,5 +784,6 @@ class HiRadixCache(RadixCache):
if self.tp_world_size > 1:
torch.distributed.barrier(group=self.tp_group)
last_host_node.release_host()
del self.ongoing_prefetch[rid]
self.cache_controller.append_host_mem_release(host_indices[:completed_tokens])
self.cache_controller.prefetch_tokens_occupied -= len(token_ids)