高并发下，出现OOM以及其他异常

版本：2.6.0M3 letture
配置：maxIdle=5, minIdle = 3
并发数：5
问题描述：for循环内（2w次）通过jetcache获取redis的数据， 偶尔会报错：writerIndex(2147480793) + minWritableBytes(65536) exceeds maxCapacity(2147483647): PooledUnsafeDirectByteBuf(ridx: 2147406050, widx: 2147480793, cap: 2147483647)，有时候甚至报netty的错误：OOM，请问下这个是版本问题还是啥问题。

Start by reproducing the report with JetCache 2.6.0M3, Redis, maxIdle=5, minIdle=3, concurrency 5, and a 20,000-iteration loop. Trace the Redis cache access and the reported Netty buffer failure, then determine whether the OOM is version-specific or caused by the access pattern; document the cause and a verified resolution.

Written by the indexing model from the issue text.