Bug Check 0x1C9: USER_MODE_HEALTH_MONITOR_LIVEDUMP
The USER_MODE_HEALTH_MONITOR_LIVEDUMP live dump has a value of 0x000001C9. It indicates that one or more critical user mode components failed to satisfy a health check.
USER_MODE_HEALTH_MONITOR_LIVEDUMP Parameters
| Parameter | Description |
|---|---|
| 1 | Process that failed to satisfy a health check within the configured timeout. |
| 2 | Health monitoring timeout (seconds). |
| 3 | Watchdog source. In combination with process address this helps to identify the source. See below for possible values. These values are shared with USER_MODE_HEALTH_MONITOR. |
| 4 | Reserved. |
Watchdog Source Values
0 : WatchdogSourceDefault
Source was not specified
1 : WatchdogSourceRhsCleanup
Monitors that RHS process goes away when
terminating on graceful exit
2 : WatchdogSourceRhsResourceDeadlockBugcheckNow
RHS was asked to immediately bugcheck machine
on resource deadlock
3 : WatchdogSourceRhsExceptionFromResource
Resource has leaked unhandled exception from an entry point,
RHS is terminating and this watchdog monitors that
process will go away
4 : WatchdogSourceRhsUnhandledException
Unhandled exception in RHS.
RHS is terminating and this watchdog monitors that
process will go away
5 : WatchdogSourceRhsResourceDeadlock
Monitors that RHS process goes away when
terminating on resource deadlock
6 : WatchdogSourceRhsResourceTypeDeadlock
Monitors that RHS process goes away when
terminating on resource type deadlock
7 : WatchdogSourceClussvcUnhandledException
Unhandled exception in clussvc.
clussvc is terminating and this watchdog monitors that
process will go away
8 : WatchdogSourceClussvcBugcheckMessageRecieved
Another cluster node has sent message asking to bugcheck this node.
9 : WatchdogSourceClussvcWatchdogBugcheck
User mode watchdog has expired and created netft watchdog
to bugchecked the node.
0xA : WatchdogSourceClussvcIsAlive
Cluster service sends heartbeat to netft every 500 milliseconds.
By default, netft expects at least 1 heartbeat per second.
If this watchdog was triggered that means clussvc is not getting
CPU to send heartbeats.
0x65 : WatchdogSourceRhsResourceDeadlockPhysicalDisk
A subclass of WatchdogSourceRhsResourceDeadlock.
0x66 : WatchdogSourceRhsResourceDeadlockStoragePool
A subclass of WatchdogSourceRhsResourceDeadlock.
0x67 : WatchdogSourceRhsResourceDeadlockFileServer
A subclass of WatchdogSourceRhsResourceDeadlock.
0x68 : WatchdogSourceRhsResourceDeadlockSODAFileServer
A subclass of WatchdogSourceRhsResourceDeadlock.
0x69 : WatchdogSourceRhsResourceDeadlockStorageReplica
A subclass of WatchdogSourceRhsResourceDeadlock.
0x6A : WatchdogSourceRhsResourceDeadlockStorageQOS
A subclass of WatchdogSourceRhsResourceDeadlock.
0x6B : WatchdogSourceRhsResourceDeadlockStorageNFSV2
A subclass of WatchdogSourceRhsResourceDeadlock.
0xC9 : WatchdogSourceRhsResourceTypeDeadlockPhysicalDisk
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
0xCA : WatchdogSourceRhsResourceTypeDeadlockStoragePool
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
0xCB : WatchdogSourceRhsResourceTypeDeadlockFileServer
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
0xCC : WatchdogSourceRhsResourceTypeDeadlockSODAFileServer
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
0xCD : WatchdogSourceRhsResourceTypeDeadlockStorageReplica
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
0xCE : WatchdogSourceRhsResourceTypeDeadlockStorageQOS
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
0xCF : WatchdogSourceRhsResourceTypeDeadlockStorageNFSV2
A subclass of WatchdogSourceRhsResourceTypeDeadlock.
Cause
One or more critical user mode components failed to satisfy a health check.
Hardware mechanisms such as watchdog timers can detect that basic kernel services are not executing. However, resource starvation issues, including memory leaks, lock contention, and scheduling priority misconfiguration, may block critical user mode components without blocking DPCs or draining the nonpaged pool.
Kernel components can extend watchdog timer functionality to user mode by periodically monitoring critical applications. This livedump indicates that a user mode health check failed in a manner such that we will attempt to terminate this application and will keep monitoring if termination completes in time. If termination does not complete in time, then the machine will be bugchecked It restores critical services by rebooting and/or allowing application failover to other servers.
(This code can never be used for a real bugcheck; it is used to identify live dumps.)
See Also
Troubleshooting a Failover Cluster using Windows Error Reporting
Failover Clustering system log events
Bug Check 0x1C9 USER_MODE_HEALTH_MONITOR