[LU-14026] symptoms of message loss or corruption after upgrading routers to lustre 2.12.5

• Type: Bug
• Resolution: Incomplete
• Priority: Critical
• Labels: llnl
• Environment: lustre 2.10.8 and 2.12.5 ; mixed OFED, MOFED, Omnipath, and tcp
• Severity: 3
• Assignee: Serguei Smirnov
• Reporter: Olaf Faaland

Description

We have two router clusters, which we call RELICs, which connect the infiniband SAN in one building with the infiniband SAN in another building, with ethernet between the routers.  All the servers and clients in both buildings, and the router nodes within the clusters which connect to the SAN, are already at lustre 2.12.5.  The routers in the RELIC clusters are at lustre 2.10.8.  In this configuration, the system is stable.

When we power cycle the RELIC routers and boot them from an image with lustre 2.12.5, the router nodes themselves think everything is fine.  There are no errors or warnings on the console, nor indications of failure in the debug log with +net.  However, we begin to see symptoms on server nodes which seem to indicate corrupt, dropped, or delayed messages:

LNetError: PPPP:0:(o2iblnd_cb.c:3351:kiblnd_check_txs_locked()) Timed out tx: active_txs, X seconds
LNetError: PPPP:0:(o2iblnd_cb.c:3351:kiblnd_check_txs_locked()) Timed out tx: tx_queue, X seconds
LNetError: PPPP:0:(o2iblnd_cb.c:3426:kiblnd_check_conns()) Timed out RDMA with ZZZ@o2ib600 (0): c: X, oc: Y, rc: Z
LustreError: PPPP:0:(events.c:450:server_bulk_callback()) event type 5, status -103, desc ffffXXXX
LustreError: PPPP:0:(ldlm_lib.c:3279:target_bulk_io()) @@@ Reconnect on bulk READ...
LustreError: PPPP:0:(ldlm_lib.c:3285:target_bulk_io()) @@@ network error on bulk READ
LustreError: PPPP:0:(ldlm_lib.c:3294:target_bulk_io()) @@@ truncated bulk READ 0(1048576) XXX
Lustre: PPPP:0:(client.c:2133:ptlrpc_expire_one_request()) @@@ Request sent has failed due to network error: ...
Lustre: ls1-OST000e: Bulk IO read error with XXX (at ZZZ@o2ib36), client will retry: rc -110

along with side-affects such as reconnect attempts.

Issue Links

• is related to: LU-15453 MDT shutdown hangs on mutex_lock, possibly cld_lock