SSH/Virtual Console hangs on guest domains configured to use Dynamic Resource Management

Asset ID:	1-72-1644336.1
Update Date:	2017-10-05
Keywords:

Solution Type Problem Resolution Sure

Solution 1644336.1 : SSH/Virtual Console hangs on guest domains configured to use Dynamic Resource Management

Applies to:

SPARC T4-4 - Version All Versions to All Versions [Release All Releases]
SPARC T4-2 - Version All Versions to All Versions [Release All Releases]
SPARC T4-1 - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Intermittent hangs or timeouts for new SSH and/or VCC console connection requests have been seen on Solaris 10 domains configured with Dynamic Resource Management (DRM).

With SSH requests this will report the connection is closed once the timeout has elapsed, for Virtual Console requests this results in a hang;

# ssh root@ldg1
Password:
Connection closed by ldg1

Virtual console connections are hanging;

ldg1 console login: root
Password:

^^ hang

To confirm whether Dynamic Resource management is enabled run the following command on the control domain;

# ldm list-domain -l -o resmgmt <domain_name>

Example output for an active domain with DRM enabled;

# ldm ls -l -o resmgmt ldg1
NAME
ldg1

CONSTRAINT
threading=max-throughput

POLICY
STATUS PRI MIN MAX LO UP BEGIN END RATE EM ATK DK NAME
running 99 2 127 10 50 00:00:00 23:59:59 5 5 16 4 policy1

WEIGHTED MEAN UTILIZATION
100%

Cause

A bug within Hypervisor can cause interrupt delivery failures, this is addressed in SysFW 8.4.2.c

Solution

Install SysFW 8.4.2.c

References

<BUG:16061313> - GUEST DOMAIN SSH AND VCC CONNECTIONS HANG UNDER LOAD WITH DRM ENABLED
<BUG:18133391> - LDMD DUMPS CORE WITH FATAL ERROR: WAITING FOR HV RESPONSE TIMEOUT ON NETRA T5-1B

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