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CONTAP-520139: System becomes unresponsive due to low FreeBSD memory availability - high dma_buffer allocations

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ontap-9
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CORE
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Issue

  • System becomes unresponsive and unexpectedly rebooted with an error:
    Process vldb unresponsive for 210 seconds in process nodewatchdog on release 9.16.1

  • Prior to the unexpected reboot, "rdma.rlib" errors might be observed in the EMS log on the affected node and on all other nodes with which it has NVRAM mirroring relationships.
    Example:
    12/12/2025 09:35:52 ClusterA-01 DEBUG rdma.rlib.connected: misc:DR:A QP is now connected.
    12/12/2025 09:35:51 ClusterA-01 DEBUG rdma.rlib.event.error: QP raid event error: client disconnect.
    12/12/2025 09:34:12 ClusterA-01 DEBUG rdma.rlib.connected: raid:DR:A QP is now connected.
    12/12/2025 09:32:32 ClusterA-01 DEBUG rdma.rlib.connected: misc:DR:A QP is now connected.
    12/12/2025 09:32:31 ClusterA-01 DEBUG rdma.rlib.event.error: QP raid event error: client disconnect.
    12/12/2025 09:29:12 ClusterA-01 DEBUG rdma.rlib.connected: raid:DR:A QP is now connected.

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