Hi,

We applied an intermediate fix for this locally and it seems to have fixed our issue.  The attached plot shows the percentage memory use on our machine with 128 Gb memory, as a rough proxy for mhttpd memory use.  After applying our fix mhttpd seems to be happy using ~7% of the memory after being up for 2.5 days.

Our fix to mjson was:

diff --git a/mjson.cxx b/mjson.cxx

index 17ee268..2443510 100644

--- a/mjson.cxx

+++ b/mjson.cxx

@@ -654,8 +654,7 @@ MJsonNode::~MJsonNode() // dtor

       delete subnodes[i];

    subnodes.clear();

-   if (arraybuffer_size > 0) {

-      assert(arraybuffer_ptr != NULL);

+   if (arraybuffer_ptr != NULL) {

       free(arraybuffer_ptr);

       arraybuffer_size = 0;

       arraybuffer_ptr = NULL;

We also applied the following in midas for good measure, although I don't think it contributed to the leak we were seeing:

diff --git a/src/mjsonrpc.cxx b/src/mjsonrpc.cxx

index 2201d228..38f0b99b 100644

--- a/src/mjsonrpc.cxx

+++ b/src/mjsonrpc.cxx

@@ -3454,6 +3454,7 @@ static MJsonNode* brpc(const MJsonNode* params)

    status = cm_connect_client(name.c_str(), &hconn);

    if (status != RPC_SUCCESS) {

+      free(buf);

       return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));

    }

I hope this is useful to someone.  As previously mentioned we make heavy use of binary RPC, so maybe other experiments don't run into the same problem.

Thanks,

Mark.