VNX: Slot x has panicked - post panic logging complete: Call to abort function

Panic Header: 
*************
DART X86_64 panic message: Call to abort function

DART stack trace:

Panicking Processor: 3
0x3a3c310: 0x13dba4 handle_panic+0xb
0x432b3ee0: 0x17b77f8 _ZN10__cxxabiv111__terminateEPFvvE+0x8
0x432b3f00: 0x17b7829 _ZSt9terminatev+0xb
0x432b3f10: 0x17b8fc8 __cxa_pure_virtual+0x4
0x432b3f20: 0x826a62 _ZN14File_LocksData11unlockRangeEP16RangeLockR
0x432b3f70: 0x83901c _ZN8Lockd_CB5startEv+0x174
0x432b3fd0: 0x154925 Sthread_startThread_internal+0x7

Root Cause Summary:
- Slot X panicked with DART message
  DART X86_64 panic message: Call to abort function
- DM panicked due to "Out of memory". 

Detailed steps taken to RCA this issue (logs, dump analysis, etc):
2017-08-17 21:44:52: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool
2017-08-17 21:44:53: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool
2017-08-17 21:44:54: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool
2017-08-17 21:44:55: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool
2017-08-17 21:44:56: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool
2017-08-17 21:44:58: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool
2017-08-17 21:45:00: 26041253888: LIB: 6: Scavenge - Memory is running low, scavenging the pool

(gdb) showmem
Total System Memory = 24 gb
Memory distribution
Number of free Pages = 28083
...
Number of Active Buffers = 20630

                           Owner     Frames   Size
        ...
              Buffer Cached Pool    2025064 15.450 gb  61.8%% <<<<<<<<<<<<<<< Memory consumed is very high
        ...
      vnode/filenode cache     432001  3.296 gb  13.2%% <<<<<<<<<<<<

This issue is fixed in NAS version 7.1.82.0.