[Filestore] Sessions not orphaned after client disconnects due to hardware node outage

[qkrorlqr]

Sometimes we see an "active" session on tablet monpage whereas the client is surely dead. After tablet restart noone reconnects to that session and it gets deleted after IdleSessionTimeout (which is correct). We don't see the following message in our logs:

nbs/cloud/filestore/libs/storage/tablet/tablet_state_sessions.cpp

Line 269 in d200ddd

"%s orphaning session c: %s, s: %s",

We either fail here:

nbs/cloud/filestore/libs/storage/tablet/tablet_state_sessions.cpp

Line 262 in d200ddd

if (it == Impl->SessionByOwner.end()) {

Or there is a bug in PipeServer. Most probably the former.