Description of problem:
When bricks are started with address sanitizer it fails with the following trace:
20:56:46 :( ⚡ /usr/local/sbin/glusterfsd -s localhost.localdomain --volfile-id r2.localhost.localdomain.home-gfs-r2_0 -p /var/lib/glusterd/vols/r2/run/localhost.localdomain-home-gfs-r2_0.pid -S /var/run/gluster/b2841ad84aaa62a337bfe471e2543598.socket --brick-name /home/gfs/r2_0 -l /var/log/glusterfs/bricks/home-gfs-r2_0.log --xlator-option *-posix.glusterd-uuid=78d15c7a-c1a2-4b5a-b0f5-df6edf282d69 --brick-port 49152 --xlator-option r2-server.listen-port=49152 -N
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==22849==ERROR: AddressSanitizer: global-buffer-overflow on address 0x7f1132bc2c40 at pc 0x7f114693c3e0 bp 0x7f113665d4e0 sp 0x7f113665d4d0
READ of size 8 at 0x7f1132bc2c40 thread T6
    #0 0x7f114693c3df in xlator_volume_option_get_list /home/pk/workspace/gerrit-repo/libglusterfs/src/options.c:887
    #1 0x7f114693c613 in xl_opt_validate /home/pk/workspace/gerrit-repo/libglusterfs/src/options.c:938
    #2 0x7f1146845d5e in dict_foreach_match /home/pk/workspace/gerrit-repo/libglusterfs/src/dict.c:1254
    #3 0x7f1146845b6e in dict_foreach /home/pk/workspace/gerrit-repo/libglusterfs/src/dict.c:1212
    #4 0x7f114693c9df in xlator_options_validate_list /home/pk/workspace/gerrit-repo/libglusterfs/src/options.c:977
    #5 0x7f114693cbb0 in xlator_options_validate /home/pk/workspace/gerrit-repo/libglusterfs/src/options.c:1005
    #6 0x7f11468f85ab in glusterfs_graph_validate_options /home/pk/workspace/gerrit-repo/libglusterfs/src/graph.c:297
    #7 0x7f11468f9c86 in glusterfs_graph_activate /home/pk/workspace/gerrit-repo/libglusterfs/src/graph.c:669
    #8 0x40f3ac in glusterfs_process_volfp /home/pk/workspace/gerrit-repo/glusterfsd/src/glusterfsd.c:2330
    #9 0x41890b in mgmt_getspec_cbk /home/pk/workspace/gerrit-repo/glusterfsd/src/glusterfsd-mgmt.c:1814
    #10 0x7f11465b9229 in rpc_clnt_handle_reply /home/pk/workspace/gerrit-repo/rpc/rpc-lib/src/rpc-clnt.c:790
    #11 0x7f11465b9c81 in rpc_clnt_notify /home/pk/workspace/gerrit-repo/rpc/rpc-lib/src/rpc-clnt.c:970
    #12 0x7f11465b0601 in rpc_transport_notify /home/pk/workspace/gerrit-repo/rpc/rpc-lib/src/rpc-transport.c:538
    #13 0x7f113813af37 in socket_event_poll_in /home/pk/workspace/gerrit-repo/rpc/rpc-transport/socket/src/socket.c:2268
    #14 0x7f113813bc2f in socket_event_handler /home/pk/workspace/gerrit-repo/rpc/rpc-transport/socket/src/socket.c:2398
    #15 0x7f1146957b23 in event_dispatch_epoll_handler /home/pk/workspace/gerrit-repo/libglusterfs/src/event-epoll.c:572
    #16 0x7f1146958516 in event_dispatch_epoll_worker /home/pk/workspace/gerrit-repo/libglusterfs/src/event-epoll.c:675
    #17 0x7f114561c6c9 in start_thread (/lib64/libpthread.so.0+0x76c9)
    #18 0x7f1144ef6f7e in clone (/lib64/libc.so.6+0x107f7e)

0x7f1132bc2c40 is located 0 bytes to the right of global variable 'options' defined in 'decompounder.c:895:23' (0x7f1132bc2c40) of size 0
  'options' is ascii string ''
SUMMARY: AddressSanitizer: global-buffer-overflow /home/pk/workspace/gerrit-repo/libglusterfs/src/options.c:887 in xlator_volume_option_get_list
Shadow bytes around the buggy address:
  0x0fe2a6570530: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a6570540: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a6570550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a6570560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a6570570: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0fe2a6570580: 00 f9 f9 f9 f9 f9 f9 f9[f9]f9 f9 f9 00 00 00 00
  0x0fe2a6570590: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a65705a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a65705b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a65705c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0fe2a65705d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
Thread T6 created by T0 here:
    #0 0x7f1146cc6488 in __interceptor_pthread_create (/lib64/libasan.so.3+0x31488)
    #1 0x7f114695882e in event_dispatch_epoll /home/pk/workspace/gerrit-repo/libglusterfs/src/event-epoll.c:727
    #2 0x7f11468d20c4 in event_dispatch /home/pk/workspace/gerrit-repo/libglusterfs/src/event.c:124
    #3 0x40fd2d in main /home/pk/workspace/gerrit-repo/glusterfsd/src/glusterfsd.c:2505
    #4 0x7f1144e0f400 in __libc_start_main (/lib64/libc.so.6+0x20400)

==22849==ABORTING


Version-Release number of selected component (if applicable):


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