[LU-18698] Client/Server grant disagreement leads to hang

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Tim Day
• Reporter: Tim Day

Description

The client and server can disagree about grant, leading to messages like:

LustreError: 3095:0:(tgt_grant.c:764:tgt_grant_check()) lustre-OST0001: cli edf3483d-7u19-944c-348c-7aa6fgr68648 claims 917387 GRANT, real grant 0

Often times, this self mitigates. However, in rare cases, the client will hang indefinitely getting ENOSPC and this message will repeat on the server continuously. Other clients appear to progress fine and the server has sufficient space.

It's not clear the root cause of this behavior, but we can at least allow the client to continuing writing in exceptional cases.