diff --git a/checkin_notes b/checkin_notes
index 7843cc27aa..8d9acd33da 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -7300,9 +7300,9 @@ David  14 Oct 2011
         work_fetch.cpp
 
 David  14 Oct 2011
-	- client: bug fix for the above
-	client/
-		work_fetch.cpp
+    - client: bug fix for the above
+    client/
+        work_fetch.cpp
 
 David  14 Oct 2011
     - scheduler: in cuda_check(), ati_check() and opencl_check()
@@ -7468,9 +7468,20 @@ David  18 Oct 2011
         cpu_sched.cpp
 
 David  18 Oct 2011
-	- client: fix bug that caused extra "<" to get written at
-		end of global_prefs_override.xml and cc_config.xml
-		when they are modified via GUI RPCs
+    - client: fix bug that caused extra "<" to get written at
+        end of global_prefs_override.xml and cc_config.xml
+        when they are modified via GUI RPCs
 
-	client/
-		gui_rpc_server_ops.cpp
+    client/
+        gui_rpc_server_ops.cpp
+
+David  19 Oct 2011
+    - client: fix crashing bug when there's a cycle in the process graph.
+        I had fixed this in one place but not another.
+    - client: don't memset(0,) a PROCINFO; use clear() instead
+
+    lib/
+        proc_control.cpp
+        procinfo_mac.cpp
+        procinfo_unix.cpp
+        procinfo_win.cpp
diff --git a/lib/proc_control.cpp b/lib/proc_control.cpp
index d4d0864297..ac7777189e 100644
--- a/lib/proc_control.cpp
+++ b/lib/proc_control.cpp
@@ -48,8 +48,11 @@ using std::vector;
 static void get_descendants_aux(PROC_MAP& pm, int pid, vector<int>& pids) {
     PROC_MAP::iterator i = pm.find(pid);
     if (i == pm.end()) return;
-    for (unsigned int j=0; j<i->second.children.size(); j++) {
-        int child_pid = i->second.children[j];
+    PROCINFO& p = i->second;
+    if (p.scanned) return;  // avoid infinite recursion
+    p.scanned = true;
+    for (unsigned int j=0; j<p.children.size(); j++) {
+        int child_pid = p.children[j];
         pids.push_back(child_pid);
         get_descendants_aux(pm, child_pid, pids);
     }
diff --git a/lib/procinfo_mac.cpp b/lib/procinfo_mac.cpp
index 1147be0789..a695449cdd 100644
--- a/lib/procinfo_mac.cpp
+++ b/lib/procinfo_mac.cpp
@@ -113,7 +113,7 @@ int procinfo_setup(PROC_MAP& pm) {
     } while (c != '\n');
 
     while (1) {
-        memset(&p, 0, sizeof(p));
+        p.clear();
         c = fscanf(fd, "%d%d%d%d%ld%d%d:%lf ",
             &p.id,
             &p.parentid,
diff --git a/lib/procinfo_unix.cpp b/lib/procinfo_unix.cpp
index 4f30727e5d..bc34f3966c 100644
--- a/lib/procinfo_unix.cpp
+++ b/lib/procinfo_unix.cpp
@@ -188,7 +188,7 @@ int procinfo_setup(PROC_MAP& pm) {
         sprintf(pidpath, "/proc/%s/psinfo", piddir->d_name);
         fd = fopen(pidpath, "r");
         if (fd) {
-            memset(&p, 0, sizeof(p));
+            p.clear();
             if (fread(&psinfo, sizeof(psinfo_t), 1, fd) == 1) {
                 p.id = psinfo.pr_pid;
                 p.parentid = psinfo.pr_ppid;
@@ -225,7 +225,7 @@ int procinfo_setup(PROC_MAP& pm) {
             if (retval) {
                 final_retval = retval;
             } else {
-                memset(&p, 0, sizeof(p));
+                p.clear();
                 p.id = ps.pid;
                 p.parentid = ps.ppid;
                 p.swap_size = ps.vsize;
diff --git a/lib/procinfo_win.cpp b/lib/procinfo_win.cpp
index 2b34409c12..e54cda1642 100644
--- a/lib/procinfo_win.cpp
+++ b/lib/procinfo_win.cpp
@@ -87,6 +87,7 @@ int get_procinfo_XP(PROC_MAP& pm) {
     pProcesses = (PSYSTEM_PROCESSES)pBuffer;
     while (pProcesses) {
         PROCINFO p;
+        p.clear();
 		p.id = pProcesses->ProcessId;
 		p.parentid = pProcesses->InheritedFromProcessId;
         p.swap_size = pProcesses->VmCounters.PagefileUsage;