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I actually did a quick run just now, doing dumps every 100 MB, and diffing an early and a later one.
I find quite quickly:

Total: 609.6 MB
   588.0  96.5%  96.5%    588.0  96.5% XrdCksManOss::Calc
    21.0   3.4%  99.9%     21.0   3.4% XrdBuffManager::Obtain (inline)
     2.4   0.4% 100.3%      2.4   0.4% PL_ArenaAllocate
     2.3   0.4% 100.7%      5.0   0.8% C_GetFunctionList
     0.2   0.0% 100.7%      0.2   0.0% XrdOucString::assign

Indeed, I do not see where this buffer:
https://github.com/xrootd/xrootd/blob/9fc407e216ec7754cbe1753cf39c40ed5a6d0a7e/src/XrdCks/XrdCksManOss.cc#L141-L145
is ever freed.
But I wonder even more why this did never bite us before XRootD 5...

Indeed, we sometimes see (when a lot of transfers happen) that the other end claims there has been a timeout during checksum from our end. Maybe this leads to repeated checksumming, enhancing the problem only now.

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