The %SYS-3-SYS_MEMERR: [chars] while [chars] address 0x[hex] message indicates that the memory management has detected memory corruption. The first [chars] could indicate one of these issues:
Out of range
Block is not free
No clusters left
Back pointer mismatch
Bad magic number
Succeeding block out of range
Succeeding block improperly aligned
Preceding block out of range
Preceding block improperly aligned
Bad process id
The second [chars] could be freeing, getting, or allocating. The [hex] field is the block address to be freed, obtained, or allocated.
For example, the %SYS-3-SYS_MEMERR: No clusters left while allocating for address 0x409c1900 message and the SYS-3-SYS_MEMERR: Null cluster while getting next from address 0x30e8eda0 message can sometimes occur together. These messages indicate that the system could be overloaded. The system can recover properly if the heavy load is temporary.
The %SYS-3-SYS_MEMERR error message indicates that during the memory block, the memory management found that information was corrupted. This problem occurs occasionally, with no ill effects on the switch.
As a first resolution step, check to see whether the system is overloaded. If the system is overloaded, reduce the load to resolve this issue.
If it is a first occurrence, monitor the switch for at least 48 hours. If it does not re-occur, then it can be considered as a Single Event Upset (SEU).
If this error occurs several times over a short period of time, check to see if the block address that the error messages mention is the same. If the block address is the same, there is a possibility that a particular sector on the memory chip is bad and must be replaced.