Dump MEMORY_PGFREE_FAILED normally means that there's some kind of corruption in the Paging Memory. It could be a hardware problem or just a temporary corruption of the paging memory. Please stop sap and
Perform command to clear any faulty shared memory at OS level:
cleanipc <instance number> remove.
i.e cleanipc 00 remove (if the instance number is 00)
If possible reboot the OS.