RHEL6 squid crashed with signal 6

Issue

• RHEL6 squid crashed with signal 6

• The following is the cache.log which was gotten when squid crashed.

  | ipcacheParse: No Address records in response to 'ipv6.msftncsi.com'
  | ipcacheParse: No Address records in response to 'ipv6.msftncsi.com'
  | assertion failed: cbdata.cc:422: "c->locks < 65535" ★
  | Starting Squid Cache version 3.1.10 for x86_64-redhat-linux-gnu...
  | Process ID 31728
  | With 4096 file descriptors available
  | Initializing IP Cache...
  | DNS Socket created at 0.0.0.0, FD 7
  | Adding domain example.co.jp from /etc/resolv.conf
  | Adding nameserver 192.168.10.21 from /etc/resolv.conf
  | Adding nameserver 192.168.10.22 from /etc/resolv.conf
  | User-Agent logging is disabled.
  | Referer logging is disabled.
  | Unlinkd pipe opened on FD 12
  | Store logging disabled
  | Swap maxSize 18874368 + 2097152 KB, estimated 1613193 objects
  | Target number of buckets: 80659
  | Using 131072 Store buckets
  | Max Mem  size: 2097152 KB
  | Max Swap size: 18874368 KB
  | Version 1 of swap file with LFS support detected... 
  | Rebuilding storage in /squid/cache (DIRTY)
  | Using Least Load store dir selection
  | Set Current Directory to /squid/cache
  | Loaded Icons.
  | Accepting  HTTP connections at 0.0.0.0:8080, FD 15.
  | HTCP Disabled.
  | Accepting SNMP messages on 0.0.0.0:3401, FD 16.
  | Configuring Parent 192.168.20.206/80/7
  | Squid plugin modules loaded: 0
  | Adaptation support is off.
  | Ready to serve requests.
  | Store rebuilding is 0.27% complete
  | Done reading /squid/cache swaplog (1512031 entries)
  | Finished rebuilding storage from disk.
  |   1067293 Entries scanned
  |         0 Invalid entries.
  |         0 With invalid flags.
  |    623656 Objects loaded.
  |         0 Objects expired.
  |    443637 Objects cancelled.
  |         0 Duplicate URLs purged.
  |         0 Swapfile clashes avoided.
  |   Took 6.30 seconds (99022.03 objects/sec).
  | Beginning Validation Procedure
  |   524288 Entries Validated so far.
  |   1048576 Entries Validated so far.
  |   Completed Validation Procedure
  |   Validated 1247321 Entries
  |   store_swap_size = 14155648
  | storeLateRelease: released 0 objects
  | ipcacheParse: No Address records in response to 'ipv6.msftncsi.com'
  | ipcacheParse: No Address records in response to 'ipv6.msftncsi.com'
  | ipcacheParse: No Address records in response to 'ipv6.msftncsi.com'
  

• The issue seems to be the same of http://bugs.squid-cache.org/show_bug.cgi?id=3413