The recently released Kernel Update 105181-20 for Solaris 2.6 
resolved many  bugs in Dynamic Reconfiguration (DR) enabled 
systems. All Customers should find benefits from the installation
of this patch release level. The specific Bug IDs of the DR 
related fixes in KU-20 are shown below. However, there are 
currently two bugs related to DR not included in this patch KU-20 
release. These two Bug IDs are provided below, along with related 
information. Each Bug ID and associated fixes should be evaluated 
by each installation prior to performing upgrades.  

+++++++++++++++++++++++++++
   As of Mid April, 2000  
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Not Included in KU-20
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BugID: 4304973 	
Description: System hangs under simultaneous kernel and user 
memory pressure.
Symptom: many threads stuck in page_create_throttle()
Occurrence of thid big is seldom seen and is generaly workload 
specific. If DR is enabled, the system can potentially encounter 
this problem. No DR operation needs to be running. 

BugID: 4277579	 
Description: Domain hangs and availrmem becomes negative. 
Fix is scheduled for KU-21.
A DR operation (drain/detach/attach) must be performed to 
encounter this problem. 

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Included in KU-20
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BugID: 4311910
Description: System panics with caged kernel wrapped around 
during expansion
If DR is enabled, the system can potentially encounter this 
problem. No DR operation needs to be running. 

BugID: 4304993
Description: Kernel cage can grow onto the wrong board number 
when lower numbered boards are attached. Subsequent DR detach 
attempts on the attached boards fail.
Workaround: Attach only higher numbered boards
A DR operation (drain/detach/attach) must be performed to 
encounter this problem. 

BugID: 4284137
Description: System panics in dr_relocate_ismpage() with 
xc_dismissed()  timeout, recv_cpuset 0xXXXXXXXX, 
xc_cpuset 0xXXXXXXXX
A DR operation (drain/detach/attach) must be performed to 
encounter this problem.