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CONTAP-182745: MGWD crashes due to memory shortage

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ontap-9
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Issue

Node experiences the following MGWD panics:

  • mgwd becoming unresponsive on watchdog
  • mgwd running out of swap space/memory.

Example panic messages:
Process mgwd unresponsive for 182 seconds (mgwd startup: "(55040)") in process nodewatchdog on release 9.13.0P4 (C)
OOM: out of swap space, process mgwd using 1346 MB in process pageout: dom0 on release 9.13.0P4 (C) (C)
 
 
Some additional observations:
  • User may lose access to cluster during this time.
  • Depending on which node is being upgraded at the time, user applications report offline for one node, while its HA partner is in partial giveback.
  • The issue is mostly seen during an ANDU.

Cluster::> storage failover show
                                 Takeover
Node           Partner          Possible State
-------------- -------------- -------- -------------------------------------
Cluster-01     Cluster-02      true     Connected to Cluster-02. Waiting
                                       for cluster applications to come
                                       online on the local node. Offline
                                       applications: mgmt, vifmgr, scsi
                                       blade, clam.
Cluster-02     Cluster-01      true     Connected to Cluster-01, Partial
                                       giveback
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