glusterd crashed on gluster volume set <volname> help. The crashed glusterd was running stat-prefetch on and off in a loop. volume set help command was issued from other glusterd.

This is the backtrace.



Core was generated by `glusterd'.
Program terminated with signal 11, Segmentation fault.
#0  0x00002aaaaab041ce in glusterd_get_volopt_content (xml_out=_gf_false)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-volgen.c:1603
1603            list_for_each_entry_safe (vol_opt, tmp, &vol_opt_handle.list, list) {
(gdb) bt
#0  0x00002aaaaab041ce in glusterd_get_volopt_content (xml_out=_gf_false)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-volgen.c:1603
#1  0x00002aaaaaae6c5a in glusterd_volset_help (dict=0x18afb030) at ../../../../../xlators/mgmt/glusterd/src/glusterd-op-sm.c:3917
#2  0x00002aaaaaae6e3c in glusterd_op_set_volume (dict=0x18afb030) at ../../../../../xlators/mgmt/glusterd/src/glusterd-op-sm.c:3954
#3  0x00002aaaaaaeb76c in glusterd_op_commit_perform (op=GD_OP_SET_VOLUME, dict=0x18afb030, op_errstr=0x7fff13c20180, 
    rsp_dict=0x18b090a0) at ../../../../../xlators/mgmt/glusterd/src/glusterd-op-sm.c:5642
#4  0x00002aaaaaaeb2b2 in glusterd_op_ac_commit_op (event=0x18b0db00, ctx=0x18b0a9e0)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-op-sm.c:5495
#5  0x00002aaaaaaebbf4 in glusterd_op_sm () at ../../../../../xlators/mgmt/glusterd/src/glusterd-op-sm.c:5916
#6  0x00002aaaaaad0b2f in glusterd_handle_commit_op (req=0x2aaaaad25044)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-handler.c:577
#7  0x00002b9f96885c3f in rpcsvc_handle_rpc_call (svc=0x18af40a0, trans=0x18af7d00, msg=0x18afdea0)
    at ../../../../rpc/rpc-lib/src/rpcsvc.c:998
#8  0x00002b9f96885fcf in rpcsvc_notify (trans=0x18af7d00, mydata=0x18af40a0, event=RPC_TRANSPORT_MSG_RECEIVED, data=0x18afdea0)
    at ../../../../rpc/rpc-lib/src/rpcsvc.c:1094
#9  0x00002b9f9688bfc9 in rpc_transport_notify (this=0x18af7d00, event=RPC_TRANSPORT_MSG_RECEIVED, data=0x18afdea0)
    at ../../../../rpc/rpc-lib/src/rpc-transport.c:1043
#10 0x00002aaaaadd44bf in socket_event_poll_in (this=0x18af7d00) at ../../../../../rpc/rpc-transport/socket/src/socket.c:1623
#11 0x00002aaaaadd4830 in socket_event_handler (fd=5, idx=1, data=0x18af7d00, poll_in=1, poll_out=0, poll_err=0)
    at ../../../../../rpc/rpc-transport/socket/src/socket.c:1737
#12 0x00002b9f96647770 in event_dispatch_epoll_handler (event_pool=0x18aecba0, events=0x18af70c0, i=0)
    at ../../../libglusterfs/src/event.c:812
#13 0x00002b9f9664795f in event_dispatch_epoll (event_pool=0x18aecba0) at ../../../libglusterfs/src/event.c:876
#14 0x00002b9f96647cbb in event_dispatch (event_pool=0x18aecba0) at ../../../libglusterfs/src/event.c:984
#15 0x0000000000405fc7 in main (argc=1, argv=0x7fff13c20b58) at ../../../glusterfsd/src/glusterfsd.c:1455
(gdb) f 0
#0  0x00002aaaaab041ce in glusterd_get_volopt_content (xml_out=_gf_false)
    at ../../../../../xlators/mgmt/glusterd/src/glusterd-volgen.c:1603
1603            list_for_each_entry_safe (vol_opt, tmp, &vol_opt_handle.list, list) {
(gdb) p vol_opt
$1 = (volume_opt_list_t *) 0x18000030
(gdb) p *vol_opt
Cannot access memory at address 0x18000030
(gdb) p vol_opt_handle.list
$2 = {next = 0x18000030, prev = 0x18b08fd0}
(gdb) l glusterd_get_volopt_content
1496    }
1497
1498
1499    int
1500    glusterd_get_volopt_content (gf_boolean_t xml_out)
1501    {
1502
1503            char                    *xlator_type = NULL;
1504            void                    *dl_handle = NULL;
1505            volume_opt_list_t        vol_opt_handle;
(gdb) 
1506            volume_opt_list_t       *vol_opt = NULL;
1507            volume_opt_list_t       *tmp = NULL;
1508            char                    *key = NULL;
1509            struct volopt_map_entry *vme = NULL;
1510            int                      ret = -1;
1511            char                    *def_val = NULL;
1512            char                    *descr = NULL;
1513            char                     output_string[8192] = {0, };
1514            char                    *output = NULL;
1515            char                     tmp_str[1024] = {0, };
(gdb)