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Article Number: 000208655

MDM crash on target site when creating RCG

Summary: In an environment utilizing replication, attempts to create RCGs fail, and the peer MDM service crashes.

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Article Content

Symptoms

MDM exp file showing the panic: 
2022/11/03 15:14:49.322854 Panic in file /data/build/workspace/ScaleIO-Common-Job/src/mdm/replication/rpl_cg/rpl_cg_mgr.c, line 5160, function rplCgMgr_HandleSyncRequest_DstHandshakeOnNewRplCg, PID 5005.Panic Expression (pReqRplCgSyncData->reqActivityState == RPL_CG_ACTIVITY_STATE__INACTIVE) || (pReqRplCgSyncData->reqActivityState == RPL_CG_ACTIVITY_STATE__ACTIVATING) .
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(mosDbg_PanicPrepare+0x13a) [0xabde9a]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(rplCgMgr_HandleSyncRequest_DstHandshakeOnNewRplCg+0x4e1) [0x655711]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(rplCgMgr_HandleRplCgSyncRequestCreateSyncResponse+0x137) [0x655857]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(rplCgMgr_HandleSyncRequestsCreateSyncResponses+0x247) [0x655b27]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102() [0x67e55b]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(netRecvGroup_WaitForWork+0x545) [0xa34295]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(netRecvGroup_WaitForWorkLoop+0x18) [0xa345c8]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(mosUmt_StartFunc+0x7a) [0x5f7a1a]
/lib64/libc.so.6(+0x48190) [0x7f9c2dda7190]
/opt/emc/scaleio/mdm/bin/mdm-3.6.100.102(mosUmt_Init+0x129) [0x8f70c9]
scli --query_upgrade output from the target showing that this site is still in upgrade mode: 
Upgrade State: Upgrade Post Processing Done Upgrade Start Version: 3.5.1000
In this example the below was the state of the two systems:
The source site is upgraded to 3.6
The target site is upgraded to 3.6 however the upgrade mode was never finalized

Cause

The target MDM service can crash when creating an RCG if the target MDM is in upgrade mode. The source MDM is expecting the target site to be at an expected version, but while the target site is in upgrade mode, it is not fully at the expected version and therefore the MDM service may crash.

Resolution

Ensure that all the system components have been fully upgraded.
Finalize the upgrade using the SCLI command from the MDM: 
scli --finalize_upgrade


Article Properties

Affected Product

PowerFlex Software

Last Published Date

27 Jul 2023

Version

6

Article Type

Solution

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