diff --git a/src/os/solaris/kstats.c b/src/os/solaris/kstats.c
index 8dab8591..d354ad99 100644
--- a/src/os/solaris/kstats.c
+++ b/src/os/solaris/kstats.c
@@ -41,6 +41,7 @@ int sigar_get_kstats(sigar_t *sigar)
     kstat_ctl_t *kc = sigar->kc;
     kstat_t *ksp;
     unsigned int i, ncpu = sysconf(_SC_NPROCESSORS_CONF);
+    int is_debug = SIGAR_LOG_IS_DEBUG(sigar);
 
     ksp = kstat_lookup(kc, "unix", -1, "vminfo");
     sigar->ks.vminfo = ksp;
@@ -61,6 +62,9 @@ int sigar_get_kstats(sigar_t *sigar)
             sigar->ks.cpuid = malloc(sizeof(*(sigar->ks.cpuid)) * ncpu);
         }
         else {
+            sigar_log_printf(sigar, SIGAR_LOG_INFO,
+                             "ncpu changed from %d to %d",
+                             sigar->ncpu, ncpu);
             if (ncpu > sigar->ks.lcpu) {
                 /* one or more cpus have been added */
                 sigar->ks.cpu = realloc(sigar->ks.cpu,
@@ -99,7 +103,10 @@ int sigar_get_kstats(sigar_t *sigar)
 
             sigar->ks.cpu[i] = ksp;
             sigar->ks.cpuid[i] = atoi(id);
-
+            if (is_debug) {
+                sigar_log_printf(sigar, SIGAR_LOG_DEBUG,
+                                 "cpu %d id=%d", i, sigar->ks.cpuid[i]);
+            }
             i++;
         }
     }
diff --git a/src/os/solaris/solaris_sigar.c b/src/os/solaris/solaris_sigar.c
index 6325846f..277fcfda 100644
--- a/src/os/solaris/solaris_sigar.c
+++ b/src/os/solaris/solaris_sigar.c
@@ -329,12 +329,25 @@ int sigar_cpu_list_get(sigar_t *sigar, sigar_cpu_list_t *cpulist)
         char *buf;
 
         if (!CPU_ONLINE(sigar->ks.cpuid[i])) {
+            sigar_log_printf(sigar, SIGAR_LOG_INFO,
+                             "cpu %d (id=%d) is offline",
+                             i, sigar->ks.cpuid[i]);
             continue;
         }
-        if (!((ksp = sigar->ks.cpu[i]) &&
-              (kstat_read(kc, ksp, NULL) >= 0)))
-        {
-            continue; /* XXX: shouldnot happen */
+
+        if (!(ksp = sigar->ks.cpu[i])) {
+            sigar_log_printf(sigar, SIGAR_LOG_ERROR,
+                             "NULL ksp for cpu %d (id=%d)",
+                             i, sigar->ks.cpuid[i]);
+            continue; /* shouldnot happen */
+        }
+
+        if (kstat_read(kc, ksp, NULL) < 0) {
+            sigar_log_printf(sigar, SIGAR_LOG_ERROR,
+                             "kstat_read failed for cpu %d (id=%d): %s",
+                             i, sigar->ks.cpuid[i],
+                             sigar_strerror(sigar, errno));
+            continue; /* shouldnot happen */
         }
 
         /*