[LU-8420] unexpected? client eviction after bulk transfer timeout

Related — Tue, 7 Feb 2017 13:49:04 +0000

The following scenario leading to client's eviction has been observed in acceptance testing:

1) client 1 owns PW lock on file A and sends write rpc to ost
2) ost initiates a bulk transfer which gets lost somewhere in networks
3) client 2 enqueues PR lock on file A
4) the server sees the incompatible lock, sends blocking ast to client 1 and starts waiting until client 1 cancels the lock.
5) bulk transfer timeouts, but client 1 does not get a reply in that case.

int tgt_brw_write(struct tgt_session_info *tsi)
...
        rc = target_bulk_io(exp, desc, &lwi);
        no_reply = rc != 0;
...

6) blocking ast callback timer expires and the server evicts client 1
7) write rpc on client 1 times out, and client 1 finds itself evicted

AT settings managed to make client's rpc timeout bigger than blast callback timeout.

Whamcloud Community JIRA

[LU-8420] unexpected? client eviction after bulk transfer timeout