diff --git a/src/core/ext/lb_policy/pick_first/pick_first.c b/src/core/ext/lb_policy/pick_first/pick_first.c
index 8dc7ed01e28..95fe372c1b6 100644
--- a/src/core/ext/lb_policy/pick_first/pick_first.c
+++ b/src/core/ext/lb_policy/pick_first/pick_first.c
@@ -391,19 +391,42 @@ static void pick_first_factory_ref(grpc_lb_policy_factory *factory) {}
 
 static void pick_first_factory_unref(grpc_lb_policy_factory *factory) {}
 
-static grpc_lb_policy *create_pick_first(grpc_lb_policy_factory *factory,
+static grpc_lb_policy *create_pick_first(grpc_exec_ctx *exec_ctx,
+                                         grpc_lb_policy_factory *factory,
                                          grpc_lb_policy_args *args) {
-  if (args->num_subchannels == 0) return NULL;
+  GPR_ASSERT(args->addresses != NULL);
+  GPR_ASSERT(args->subchannel_factory != NULL);
+
+  if (args->addresses->naddrs == 0) return NULL;
+
   pick_first_lb_policy *p = gpr_malloc(sizeof(*p));
   memset(p, 0, sizeof(*p));
-  grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable);
+
   p->subchannels =
-      gpr_malloc(sizeof(grpc_subchannel *) * args->num_subchannels);
-  p->num_subchannels = args->num_subchannels;
-  grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
-                               "pick_first");
-  memcpy(p->subchannels, args->subchannels,
-         sizeof(grpc_subchannel *) * args->num_subchannels);
+      gpr_malloc(sizeof(grpc_subchannel *) * args->addresses->naddrs);
+  memset(p->subchannels, 0, sizeof(*p->subchannels) * args->addresses->naddrs);
+  grpc_subchannel_args sc_args;
+  size_t subchannel_idx = 0;
+  for (size_t i = 0; i < args->addresses->naddrs; i++) {
+    memset(&sc_args, 0, sizeof(grpc_subchannel_args));
+    sc_args.addr = (struct sockaddr *)(args->addresses->addrs[i].addr);
+    sc_args.addr_len = (size_t)args->addresses->addrs[i].len;
+
+    grpc_subchannel *subchannel = grpc_subchannel_factory_create_subchannel(
+        exec_ctx, args->subchannel_factory, &sc_args);
+
+    if (subchannel != NULL) {
+      p->subchannels[subchannel_idx++] = subchannel;
+    }
+  }
+  if (subchannel_idx == 0) {
+    gpr_free(p->subchannels);
+    gpr_free(p);
+    return NULL;
+  }
+  p->num_subchannels = subchannel_idx;
+
+  grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable);
   grpc_closure_init(&p->connectivity_changed, pf_connectivity_changed, p);
   gpr_mu_init(&p->mu);
   return &p->base;
diff --git a/src/core/ext/lb_policy/round_robin/round_robin.c b/src/core/ext/lb_policy/round_robin/round_robin.c
index b1996922bf9..eb6cccdca9f 100644
--- a/src/core/ext/lb_policy/round_robin/round_robin.c
+++ b/src/core/ext/lb_policy/round_robin/round_robin.c
@@ -498,30 +498,47 @@ static void round_robin_factory_ref(grpc_lb_policy_factory *factory) {}
 
 static void round_robin_factory_unref(grpc_lb_policy_factory *factory) {}
 
-static grpc_lb_policy *create_round_robin(grpc_lb_policy_factory *factory,
+static grpc_lb_policy *create_round_robin(grpc_exec_ctx *exec_ctx,
+                                          grpc_lb_policy_factory *factory,
                                           grpc_lb_policy_args *args) {
-  size_t i;
+  GPR_ASSERT(args->addresses != NULL);
+  GPR_ASSERT(args->subchannel_factory != NULL);
+
   round_robin_lb_policy *p = gpr_malloc(sizeof(*p));
-  GPR_ASSERT(args->num_subchannels > 0);
   memset(p, 0, sizeof(*p));
-  grpc_lb_policy_init(&p->base, &round_robin_lb_policy_vtable);
-  p->num_subchannels = args->num_subchannels;
-  p->subchannels = gpr_malloc(sizeof(*p->subchannels) * p->num_subchannels);
-  memset(p->subchannels, 0, sizeof(*p->subchannels) * p->num_subchannels);
-  grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
-                               "round_robin");
 
-  gpr_mu_init(&p->mu);
-  for (i = 0; i < args->num_subchannels; i++) {
-    subchannel_data *sd = gpr_malloc(sizeof(*sd));
-    memset(sd, 0, sizeof(*sd));
-    p->subchannels[i] = sd;
-    sd->policy = p;
-    sd->index = i;
-    sd->subchannel = args->subchannels[i];
-    grpc_closure_init(&sd->connectivity_changed_closure,
-                      rr_connectivity_changed, sd);
+  p->subchannels =
+      gpr_malloc(sizeof(*p->subchannels) * args->addresses->naddrs);
+  memset(p->subchannels, 0, sizeof(*p->subchannels) * args->addresses->naddrs);
+
+  grpc_subchannel_args sc_args;
+  size_t subchannel_idx = 0;
+  for (size_t i = 0; i < args->addresses->naddrs; i++) {
+    memset(&sc_args, 0, sizeof(grpc_subchannel_args));
+    sc_args.addr = (struct sockaddr *)(args->addresses->addrs[i].addr);
+    sc_args.addr_len = (size_t)args->addresses->addrs[i].len;
+
+    grpc_subchannel *subchannel = grpc_subchannel_factory_create_subchannel(
+        exec_ctx, args->subchannel_factory, &sc_args);
+
+    if (subchannel != NULL) {
+      subchannel_data *sd = gpr_malloc(sizeof(*sd));
+      memset(sd, 0, sizeof(*sd));
+      p->subchannels[subchannel_idx] = sd;
+      sd->policy = p;
+      sd->index = subchannel_idx;
+      sd->subchannel = subchannel;
+      ++subchannel_idx;
+      grpc_closure_init(&sd->connectivity_changed_closure,
+                        rr_connectivity_changed, sd);
+    }
+  }
+  if (subchannel_idx == 0) {
+    gpr_free(p->subchannels);
+    gpr_free(p);
+    return NULL;
   }
+  p->num_subchannels = subchannel_idx;
 
   /* The (dummy node) root of the ready list */
   p->ready_list.subchannel = NULL;
@@ -529,6 +546,10 @@ static grpc_lb_policy *create_round_robin(grpc_lb_policy_factory *factory,
   p->ready_list.next = NULL;
   p->ready_list_last_pick = &p->ready_list;
 
+  grpc_lb_policy_init(&p->base, &round_robin_lb_policy_vtable);
+  grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
+                               "round_robin");
+  gpr_mu_init(&p->mu);
   return &p->base;
 }
 
diff --git a/src/core/lib/channel/channel_args.h b/src/core/lib/channel/channel_args.h
index 67d287ec6b1..1ea202c5431 100644
--- a/src/core/lib/channel/channel_args.h
+++ b/src/core/lib/channel/channel_args.h
@@ -37,23 +37,23 @@
 #include <grpc/compression.h>
 #include <grpc/grpc.h>
 
-/* Copy some arguments */
+/** Copy the arguments in \a src into a new instance */
 grpc_channel_args *grpc_channel_args_copy(const grpc_channel_args *src);
 
-/* Copy some arguments, stably sorting keys */
-grpc_channel_args *grpc_channel_args_normalize(const grpc_channel_args *a);
+/** Copy the arguments in \a src into a new instance, stably sorting keys */
+grpc_channel_args *grpc_channel_args_normalize(const grpc_channel_args *src);
 
-/** Copy some arguments and add the to_add parameter in the end.
-   If to_add is NULL, it is equivalent to call grpc_channel_args_copy. */
+/** Copy the arguments in \a src and append \a to_add. If \a to_add is NULL, it
+ * is equivalent to calling \a grpc_channel_args_copy. */
 grpc_channel_args *grpc_channel_args_copy_and_add(const grpc_channel_args *src,
                                                   const grpc_arg *to_add,
                                                   size_t num_to_add);
 
-/** Copy args from a then args from b into a new channel args */
+/** Concatenate args from \a a and \a b into a new instance */
 grpc_channel_args *grpc_channel_args_merge(const grpc_channel_args *a,
                                            const grpc_channel_args *b);
 
-/** Destroy arguments created by grpc_channel_args_copy */
+/** Destroy arguments created by \a grpc_channel_args_copy */
 void grpc_channel_args_destroy(grpc_channel_args *a);
 
 /** Reads census_enabled settings from channel args. Returns 1 if census_enabled
diff --git a/src/core/lib/client_config/lb_policy_factory.c b/src/core/lib/client_config/lb_policy_factory.c
index 2ca6f42f899..ede1d624afb 100644
--- a/src/core/lib/client_config/lb_policy_factory.c
+++ b/src/core/lib/client_config/lb_policy_factory.c
@@ -42,7 +42,8 @@ void grpc_lb_policy_factory_unref(grpc_lb_policy_factory* factory) {
 }
 
 grpc_lb_policy* grpc_lb_policy_factory_create_lb_policy(
-    grpc_lb_policy_factory* factory, grpc_lb_policy_args* args) {
+    grpc_exec_ctx* exec_ctx, grpc_lb_policy_factory* factory,
+    grpc_lb_policy_args* args) {
   if (factory == NULL) return NULL;
-  return factory->vtable->create_lb_policy(factory, args);
+  return factory->vtable->create_lb_policy(exec_ctx, factory, args);
 }
diff --git a/src/core/lib/client_config/lb_policy_factory.h b/src/core/lib/client_config/lb_policy_factory.h
index 36eaf178d93..9a93a8ca3f3 100644
--- a/src/core/lib/client_config/lb_policy_factory.h
+++ b/src/core/lib/client_config/lb_policy_factory.h
@@ -35,7 +35,10 @@
 #define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_FACTORY_H
 
 #include "src/core/lib/client_config/lb_policy.h"
-#include "src/core/lib/client_config/subchannel.h"
+#include "src/core/lib/client_config/subchannel_factory.h"
+#include "src/core/lib/iomgr/resolve_address.h"
+
+#include "src/core/lib/iomgr/exec_ctx.h"
 
 typedef struct grpc_lb_policy_factory grpc_lb_policy_factory;
 typedef struct grpc_lb_policy_factory_vtable grpc_lb_policy_factory_vtable;
@@ -47,8 +50,8 @@ struct grpc_lb_policy_factory {
 };
 
 typedef struct grpc_lb_policy_args {
-  grpc_subchannel **subchannels;
-  size_t num_subchannels;
+  grpc_resolved_addresses *addresses;
+  grpc_subchannel_factory *subchannel_factory;
 } grpc_lb_policy_args;
 
 struct grpc_lb_policy_factory_vtable {
@@ -56,7 +59,8 @@ struct grpc_lb_policy_factory_vtable {
   void (*unref)(grpc_lb_policy_factory *factory);
 
   /** Implementation of grpc_lb_policy_factory_create_lb_policy */
-  grpc_lb_policy *(*create_lb_policy)(grpc_lb_policy_factory *factory,
+  grpc_lb_policy *(*create_lb_policy)(grpc_exec_ctx *exec_ctx,
+                                      grpc_lb_policy_factory *factory,
                                       grpc_lb_policy_args *args);
 
   /** Name for the LB policy this factory implements */
@@ -68,6 +72,7 @@ void grpc_lb_policy_factory_unref(grpc_lb_policy_factory *factory);
 
 /** Create a lb_policy instance. */
 grpc_lb_policy *grpc_lb_policy_factory_create_lb_policy(
-    grpc_lb_policy_factory *factory, grpc_lb_policy_args *args);
+    grpc_exec_ctx *exec_ctx, grpc_lb_policy_factory *factory,
+    grpc_lb_policy_args *args);
 
 #endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_FACTORY_H */
diff --git a/src/core/lib/client_config/lb_policy_registry.c b/src/core/lib/client_config/lb_policy_registry.c
index 82f70ed8c0b..d1dc502b9ab 100644
--- a/src/core/lib/client_config/lb_policy_registry.c
+++ b/src/core/lib/client_config/lb_policy_registry.c
@@ -74,10 +74,10 @@ static grpc_lb_policy_factory *lookup_factory(const char *name) {
   return NULL;
 }
 
-grpc_lb_policy *grpc_lb_policy_create(const char *name,
+grpc_lb_policy *grpc_lb_policy_create(grpc_exec_ctx *exec_ctx, const char *name,
                                       grpc_lb_policy_args *args) {
   grpc_lb_policy_factory *factory = lookup_factory(name);
   grpc_lb_policy *lb_policy =
-      grpc_lb_policy_factory_create_lb_policy(factory, args);
+      grpc_lb_policy_factory_create_lb_policy(exec_ctx, factory, args);
   return lb_policy;
 }
diff --git a/src/core/lib/client_config/lb_policy_registry.h b/src/core/lib/client_config/lb_policy_registry.h
index da3a5d5e797..1ecf7fe39f6 100644
--- a/src/core/lib/client_config/lb_policy_registry.h
+++ b/src/core/lib/client_config/lb_policy_registry.h
@@ -35,6 +35,7 @@
 #define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_REGISTRY_H
 
 #include "src/core/lib/client_config/lb_policy_factory.h"
+#include "src/core/lib/iomgr/exec_ctx.h"
 
 /** Initialize the registry and set \a default_factory as the factory to be
  * returned when no name is provided in a lookup */
@@ -48,7 +49,7 @@ void grpc_register_lb_policy(grpc_lb_policy_factory *factory);
  *
  * If \a name is NULL, the default factory from \a grpc_lb_policy_registry_init
  * will be returned. */
-grpc_lb_policy *grpc_lb_policy_create(const char *name,
+grpc_lb_policy *grpc_lb_policy_create(grpc_exec_ctx *exec_ctx, const char *name,
                                       grpc_lb_policy_args *args);
 
 #endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICY_REGISTRY_H */
diff --git a/src/core/lib/client_config/resolvers/dns_resolver.c b/src/core/lib/client_config/resolvers/dns_resolver.c
index ab445730adb..62bccdd0459 100644
--- a/src/core/lib/client_config/resolvers/dns_resolver.c
+++ b/src/core/lib/client_config/resolvers/dns_resolver.c
@@ -162,38 +162,23 @@ static void dns_on_resolved(grpc_exec_ctx *exec_ctx, void *arg,
                             grpc_resolved_addresses *addresses) {
   dns_resolver *r = arg;
   grpc_client_config *config = NULL;
-  grpc_subchannel **subchannels;
-  grpc_subchannel_args args;
   grpc_lb_policy *lb_policy;
-  size_t i;
   gpr_mu_lock(&r->mu);
   GPR_ASSERT(r->resolving);
   r->resolving = 0;
   if (addresses != NULL) {
     grpc_lb_policy_args lb_policy_args;
     config = grpc_client_config_create();
-    subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs);
-    size_t naddrs = 0;
-    for (i = 0; i < addresses->naddrs; i++) {
-      memset(&args, 0, sizeof(args));
-      args.addr = (struct sockaddr *)(addresses->addrs[i].addr);
-      args.addr_len = (size_t)addresses->addrs[i].len;
-      grpc_subchannel *subchannel = grpc_subchannel_factory_create_subchannel(
-          exec_ctx, r->subchannel_factory, &args);
-      if (subchannel != NULL) {
-        subchannels[naddrs++] = subchannel;
-      }
-    }
     memset(&lb_policy_args, 0, sizeof(lb_policy_args));
-    lb_policy_args.subchannels = subchannels;
-    lb_policy_args.num_subchannels = naddrs;
-    lb_policy = grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
+    lb_policy_args.addresses = addresses;
+    lb_policy_args.subchannel_factory = r->subchannel_factory;
+    lb_policy =
+        grpc_lb_policy_create(exec_ctx, r->lb_policy_name, &lb_policy_args);
     if (lb_policy != NULL) {
       grpc_client_config_set_lb_policy(config, lb_policy);
       GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "construction");
     }
     grpc_resolved_addresses_destroy(addresses);
-    gpr_free(subchannels);
   } else {
     gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
     gpr_timespec next_try = gpr_backoff_step(&r->backoff_state, now);
diff --git a/src/core/lib/client_config/resolvers/sockaddr_resolver.c b/src/core/lib/client_config/resolvers/sockaddr_resolver.c
index 66cddc3ed90..c787bd57d68 100644
--- a/src/core/lib/client_config/resolvers/sockaddr_resolver.c
+++ b/src/core/lib/client_config/resolvers/sockaddr_resolver.c
@@ -58,11 +58,7 @@ typedef struct {
   char *lb_policy_name;
 
   /** the addresses that we've 'resolved' */
-  struct sockaddr_storage *addrs;
-  /** the corresponding length of the addresses */
-  size_t *addrs_len;
-  /** how many elements in \a addrs */
-  size_t num_addrs;
+  grpc_resolved_addresses *addresses;
 
   /** mutex guarding the rest of the state */
   gpr_mu mu;
@@ -125,28 +121,14 @@ static void sockaddr_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver,
 
 static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx,
                                               sockaddr_resolver *r) {
-  grpc_client_config *cfg;
-  grpc_lb_policy *lb_policy;
-  grpc_lb_policy_args lb_policy_args;
-  grpc_subchannel **subchannels;
-  grpc_subchannel_args args;
-
   if (r->next_completion != NULL && !r->published) {
-    size_t i;
-    cfg = grpc_client_config_create();
-    subchannels = gpr_malloc(sizeof(grpc_subchannel *) * r->num_addrs);
-    for (i = 0; i < r->num_addrs; i++) {
-      memset(&args, 0, sizeof(args));
-      args.addr = (struct sockaddr *)&r->addrs[i];
-      args.addr_len = r->addrs_len[i];
-      subchannels[i] = grpc_subchannel_factory_create_subchannel(
-          exec_ctx, r->subchannel_factory, &args);
-    }
+    grpc_client_config *cfg = grpc_client_config_create();
+    grpc_lb_policy_args lb_policy_args;
     memset(&lb_policy_args, 0, sizeof(lb_policy_args));
-    lb_policy_args.subchannels = subchannels;
-    lb_policy_args.num_subchannels = r->num_addrs;
-    lb_policy = grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
-    gpr_free(subchannels);
+    lb_policy_args.addresses = r->addresses;
+    lb_policy_args.subchannel_factory = r->subchannel_factory;
+    grpc_lb_policy *lb_policy =
+        grpc_lb_policy_create(exec_ctx, r->lb_policy_name, &lb_policy_args);
     grpc_client_config_set_lb_policy(cfg, lb_policy);
     GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "sockaddr");
     r->published = 1;
@@ -160,8 +142,7 @@ static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) {
   sockaddr_resolver *r = (sockaddr_resolver *)gr;
   gpr_mu_destroy(&r->mu);
   grpc_subchannel_factory_unref(exec_ctx, r->subchannel_factory);
-  gpr_free(r->addrs);
-  gpr_free(r->addrs_len);
+  grpc_resolved_addresses_destroy(r->addresses);
   gpr_free(r->lb_policy_name);
   gpr_free(r);
 }
@@ -269,7 +250,6 @@ static void do_nothing(void *ignored) {}
 static grpc_resolver *sockaddr_create(
     grpc_resolver_args *args, const char *default_lb_policy_name,
     int parse(grpc_uri *uri, struct sockaddr_storage *dst, size_t *len)) {
-  size_t i;
   int errors_found = 0; /* GPR_FALSE */
   sockaddr_resolver *r;
   gpr_slice path_slice;
@@ -309,15 +289,18 @@ static grpc_resolver *sockaddr_create(
   gpr_slice_buffer_init(&path_parts);
 
   gpr_slice_split(path_slice, ",", &path_parts);
-  r->num_addrs = path_parts.count;
-  r->addrs = gpr_malloc(sizeof(struct sockaddr_storage) * r->num_addrs);
-  r->addrs_len = gpr_malloc(sizeof(*r->addrs_len) * r->num_addrs);
+  r->addresses = gpr_malloc(sizeof(grpc_resolved_addresses));
+  r->addresses->naddrs = path_parts.count;
+  r->addresses->addrs =
+      gpr_malloc(sizeof(grpc_resolved_address) * r->addresses->naddrs);
 
-  for (i = 0; i < r->num_addrs; i++) {
+  for (size_t i = 0; i < r->addresses->naddrs; i++) {
     grpc_uri ith_uri = *args->uri;
     char *part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII);
     ith_uri.path = part_str;
-    if (!parse(&ith_uri, &r->addrs[i], &r->addrs_len[i])) {
+    if (!parse(&ith_uri,
+               (struct sockaddr_storage *)(&r->addresses->addrs[i].addr),
+               &r->addresses->addrs[i].len)) {
       errors_found = 1; /* GPR_TRUE */
     }
     gpr_free(part_str);
@@ -328,8 +311,7 @@ static grpc_resolver *sockaddr_create(
   gpr_slice_unref(path_slice);
   if (errors_found) {
     gpr_free(r->lb_policy_name);
-    gpr_free(r->addrs);
-    gpr_free(r->addrs_len);
+    grpc_resolved_addresses_destroy(r->addresses);
     gpr_free(r);
     return NULL;
   }
diff --git a/src/core/lib/client_config/resolvers/zookeeper_resolver.c b/src/core/lib/client_config/resolvers/zookeeper_resolver.c
index 3bb0bbdf5cd..404dfcd4234 100644
--- a/src/core/lib/client_config/resolvers/zookeeper_resolver.c
+++ b/src/core/lib/client_config/resolvers/zookeeper_resolver.c
@@ -184,28 +184,22 @@ static void zookeeper_on_resolved(grpc_exec_ctx *exec_ctx, void *arg,
                                   grpc_resolved_addresses *addresses) {
   zookeeper_resolver *r = arg;
   grpc_client_config *config = NULL;
-  grpc_subchannel **subchannels;
-  grpc_subchannel_args args;
   grpc_lb_policy *lb_policy;
-  size_t i;
+
   if (addresses != NULL) {
     grpc_lb_policy_args lb_policy_args;
     config = grpc_client_config_create();
-    subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs);
-    for (i = 0; i < addresses->naddrs; i++) {
-      memset(&args, 0, sizeof(args));
-      args.addr = (struct sockaddr *)(addresses->addrs[i].addr);
-      args.addr_len = addresses->addrs[i].len;
-      subchannels[i] = grpc_subchannel_factory_create_subchannel(
-          exec_ctx, r->subchannel_factory, &args);
+
+    lb_policy_args.addresses = addresses;
+    lb_policy_args.subchannel_factory = r->subchannel_factory;
+    lb_policy =
+        grpc_lb_policy_create(exec_ctx, r->lb_policy_name, &lb_policy_args);
+
+    if (lb_policy != NULL) {
+      grpc_client_config_set_lb_policy(config, lb_policy);
+      GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "construction");
     }
-    lb_policy_args.subchannels = subchannels;
-    lb_policy_args.num_subchannels = addresses->naddrs;
-    lb_policy = grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
-    grpc_client_config_set_lb_policy(config, lb_policy);
-    GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "construction");
     grpc_resolved_addresses_destroy(addresses);
-    gpr_free(subchannels);
   }
   gpr_mu_lock(&r->mu);
   GPR_ASSERT(r->resolving == 1);
diff --git a/src/core/lib/iomgr/pollset_set_windows.c b/src/core/lib/iomgr/pollset_set_windows.c
index 0b14e446ae6..720fc331edc 100644
--- a/src/core/lib/iomgr/pollset_set_windows.c
+++ b/src/core/lib/iomgr/pollset_set_windows.c
@@ -37,7 +37,7 @@
 
 #include "src/core/lib/iomgr/pollset_set_windows.h"
 
-grpc_pollset_set* grpc_pollset_set_create(pollset_set) { return NULL; }
+grpc_pollset_set* grpc_pollset_set_create(void) { return NULL; }
 
 void grpc_pollset_set_destroy(grpc_pollset_set* pollset_set) {}
 
diff --git a/src/ruby/ext/grpc/rb_byte_buffer.c b/src/ruby/ext/grpc/rb_byte_buffer.c
index db7cac363a3..9b617e13d3c 100644
--- a/src/ruby/ext/grpc/rb_byte_buffer.c
+++ b/src/ruby/ext/grpc/rb_byte_buffer.c
@@ -50,21 +50,18 @@ grpc_byte_buffer* grpc_rb_s_to_byte_buffer(char *string, size_t length) {
 }
 
 VALUE grpc_rb_byte_buffer_to_s(grpc_byte_buffer *buffer) {
-  size_t length = 0;
-  char *string = NULL;
-  size_t offset = 0;
+  VALUE rb_string;
   grpc_byte_buffer_reader reader;
   gpr_slice next;
   if (buffer == NULL) {
     return Qnil;
-
   }
-  length = grpc_byte_buffer_length(buffer);
-  string = xmalloc(length + 1);
+  rb_string = rb_str_buf_new(grpc_byte_buffer_length(buffer));
   grpc_byte_buffer_reader_init(&reader, buffer);
   while (grpc_byte_buffer_reader_next(&reader, &next) != 0) {
-    memcpy(string + offset, GPR_SLICE_START_PTR(next), GPR_SLICE_LENGTH(next));
-    offset += GPR_SLICE_LENGTH(next);
+    rb_str_cat(rb_string, (const char *) GPR_SLICE_START_PTR(next),
+               GPR_SLICE_LENGTH(next));
+    gpr_slice_unref(next);
   }
-  return rb_str_new(string, length);
+  return rb_string;
 }
diff --git a/src/ruby/ext/grpc/rb_call.c b/src/ruby/ext/grpc/rb_call.c
index cd0aa6aaf20..b0829efdc78 100644
--- a/src/ruby/ext/grpc/rb_call.c
+++ b/src/ruby/ext/grpc/rb_call.c
@@ -551,13 +551,26 @@ static void grpc_run_batch_stack_init(run_batch_stack *st,
 /* grpc_run_batch_stack_cleanup ensures the run_batch_stack is properly
  * cleaned up */
 static void grpc_run_batch_stack_cleanup(run_batch_stack *st) {
+  size_t i = 0;
+
   grpc_metadata_array_destroy(&st->send_metadata);
   grpc_metadata_array_destroy(&st->send_trailing_metadata);
   grpc_metadata_array_destroy(&st->recv_metadata);
   grpc_metadata_array_destroy(&st->recv_trailing_metadata);
+
   if (st->recv_status_details != NULL) {
     gpr_free(st->recv_status_details);
   }
+
+  if (st->recv_message != NULL) {
+    grpc_byte_buffer_destroy(st->recv_message);
+  }
+
+  for (i = 0; i < st->op_num; i++) {
+    if (st->ops[i].op == GRPC_OP_SEND_MESSAGE) {
+      grpc_byte_buffer_destroy(st->ops[i].data.send_message);
+    }
+  }
 }
 
 /* grpc_run_batch_stack_fill_ops fills the run_batch_stack ops array from
@@ -643,7 +656,6 @@ static VALUE grpc_run_batch_stack_build_result(run_batch_stack *st) {
         break;
       case GRPC_OP_SEND_MESSAGE:
         rb_struct_aset(result, sym_send_message, Qtrue);
-        grpc_byte_buffer_destroy(st->ops[i].data.send_message);
         break;
       case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
         rb_struct_aset(result, sym_send_close, Qtrue);
diff --git a/test/core/client_config/lb_policies_test.c b/test/core/client_config/lb_policies_test.c
index fcb8630cabb..ac42891f946 100644
--- a/test/core/client_config/lb_policies_test.c
+++ b/test/core/client_config/lb_policies_test.c
@@ -872,6 +872,7 @@ static void verify_rebirth_round_robin(const servers_fixture *f,
 }
 
 int main(int argc, char **argv) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   test_spec *spec;
   size_t i;
   const size_t NUM_ITERS = 10;
@@ -881,9 +882,9 @@ int main(int argc, char **argv) {
   grpc_init();
   grpc_tracer_set_enabled("round_robin", 1);
 
-  GPR_ASSERT(grpc_lb_policy_create("this-lb-policy-does-not-exist", NULL) ==
-             NULL);
-  GPR_ASSERT(grpc_lb_policy_create(NULL, NULL) == NULL);
+  GPR_ASSERT(grpc_lb_policy_create(&exec_ctx, "this-lb-policy-does-not-exist",
+                                   NULL) == NULL);
+  GPR_ASSERT(grpc_lb_policy_create(&exec_ctx, NULL, NULL) == NULL);
 
   spec = test_spec_create(NUM_ITERS, NUM_SERVERS);
   /* everything is fine, all servers stay up the whole time and life's peachy */
@@ -935,6 +936,7 @@ int main(int argc, char **argv) {
   test_pending_calls(4);
   test_ping();
 
+  grpc_exec_ctx_finish(&exec_ctx);
   grpc_shutdown();
   return 0;
 }
diff --git a/test/cpp/end2end/thread_stress_test.cc b/test/cpp/end2end/thread_stress_test.cc
index 8760b8d28e3..3f75a0c92eb 100644
--- a/test/cpp/end2end/thread_stress_test.cc
+++ b/test/cpp/end2end/thread_stress_test.cc
@@ -58,6 +58,7 @@ using std::chrono::system_clock;
 const int kNumThreads = 100;  // Number of threads
 const int kNumAsyncSendThreads = 2;
 const int kNumAsyncReceiveThreads = 50;
+const int kNumAsyncServerThreads = 50;
 const int kNumRpcs = 1000;  // Number of RPCs per thread
 
 namespace grpc {
@@ -174,23 +175,12 @@ class TestServiceImplDupPkg
   }
 };
 
+template <class Service>
 class CommonStressTest {
  public:
   CommonStressTest() : kMaxMessageSize_(8192) {}
-  void SetUp() {
-    int port = grpc_pick_unused_port_or_die();
-    server_address_ << "localhost:" << port;
-    // Setup server
-    ServerBuilder builder;
-    builder.AddListeningPort(server_address_.str(),
-                             InsecureServerCredentials());
-    builder.RegisterService(&service_);
-    builder.SetMaxMessageSize(
-        kMaxMessageSize_);  // For testing max message size.
-    builder.RegisterService(&dup_pkg_service_);
-    server_ = builder.BuildAndStart();
-  }
-  void TearDown() { server_->Shutdown(); }
+  virtual void SetUp() = 0;
+  virtual void TearDown() = 0;
   void ResetStub() {
     std::shared_ptr<Channel> channel =
         CreateChannel(server_address_.str(), InsecureChannelCredentials());
@@ -198,15 +188,137 @@ class CommonStressTest {
   }
   grpc::testing::EchoTestService::Stub* GetStub() { return stub_.get(); }
 
+ protected:
+  void SetUpStart(ServerBuilder* builder, Service* service) {
+    int port = grpc_pick_unused_port_or_die();
+    server_address_ << "localhost:" << port;
+    // Setup server
+    builder->AddListeningPort(server_address_.str(),
+                              InsecureServerCredentials());
+    builder->RegisterService(service);
+    builder->SetMaxMessageSize(
+        kMaxMessageSize_);  // For testing max message size.
+    builder->RegisterService(&dup_pkg_service_);
+  }
+  void SetUpEnd(ServerBuilder* builder) { server_ = builder->BuildAndStart(); }
+  void TearDownStart() { server_->Shutdown(); }
+  void TearDownEnd() {}
+
  private:
   std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
   std::unique_ptr<Server> server_;
   std::ostringstream server_address_;
   const int kMaxMessageSize_;
-  TestServiceImpl service_;
   TestServiceImplDupPkg dup_pkg_service_;
 };
 
+class CommonStressTestSyncServer : public CommonStressTest<TestServiceImpl> {
+ public:
+  void SetUp() GRPC_OVERRIDE {
+    ServerBuilder builder;
+    SetUpStart(&builder, &service_);
+    SetUpEnd(&builder);
+  }
+  void TearDown() GRPC_OVERRIDE {
+    TearDownStart();
+    TearDownEnd();
+  }
+
+ private:
+  TestServiceImpl service_;
+};
+
+class CommonStressTestAsyncServer
+    : public CommonStressTest<::grpc::testing::EchoTestService::AsyncService> {
+ public:
+  void SetUp() GRPC_OVERRIDE {
+    shutting_down_ = false;
+    ServerBuilder builder;
+    SetUpStart(&builder, &service_);
+    cq_ = builder.AddCompletionQueue();
+    SetUpEnd(&builder);
+    contexts_ = new Context[kNumAsyncServerThreads * 100];
+    for (int i = 0; i < kNumAsyncServerThreads * 100; i++) {
+      RefreshContext(i);
+    }
+    for (int i = 0; i < kNumAsyncServerThreads; i++) {
+      server_threads_.push_back(
+          new std::thread(&CommonStressTestAsyncServer::ProcessRpcs, this));
+    }
+  }
+  void TearDown() GRPC_OVERRIDE {
+    {
+      unique_lock<mutex> l(mu_);
+      TearDownStart();
+      shutting_down_ = true;
+      cq_->Shutdown();
+    }
+
+    for (int i = 0; i < kNumAsyncServerThreads; i++) {
+      server_threads_[i]->join();
+      delete server_threads_[i];
+    }
+
+    void* ignored_tag;
+    bool ignored_ok;
+    while (cq_->Next(&ignored_tag, &ignored_ok))
+      ;
+    TearDownEnd();
+    delete[] contexts_;
+  }
+
+ private:
+  void ProcessRpcs() {
+    void* tag;
+    bool ok;
+    while (cq_->Next(&tag, &ok)) {
+      if (ok) {
+        int i = static_cast<int>(reinterpret_cast<intptr_t>(tag));
+        switch (contexts_[i].state) {
+          case Context::READY: {
+            contexts_[i].state = Context::DONE;
+            EchoResponse send_response;
+            send_response.set_message(contexts_[i].recv_request.message());
+            contexts_[i].response_writer->Finish(send_response, Status::OK,
+                                                 tag);
+            break;
+          }
+          case Context::DONE:
+            RefreshContext(i);
+            break;
+        }
+      }
+    }
+  }
+  void RefreshContext(int i) {
+    unique_lock<mutex> l(mu_);
+    if (!shutting_down_) {
+      contexts_[i].state = Context::READY;
+      contexts_[i].srv_ctx.reset(new ServerContext);
+      contexts_[i].response_writer.reset(
+          new grpc::ServerAsyncResponseWriter<EchoResponse>(
+              contexts_[i].srv_ctx.get()));
+      service_.RequestEcho(contexts_[i].srv_ctx.get(),
+                           &contexts_[i].recv_request,
+                           contexts_[i].response_writer.get(), cq_.get(),
+                           cq_.get(), (void*)(intptr_t)i);
+    }
+  }
+  struct Context {
+    std::unique_ptr<ServerContext> srv_ctx;
+    std::unique_ptr<grpc::ServerAsyncResponseWriter<EchoResponse>>
+        response_writer;
+    EchoRequest recv_request;
+    enum { READY, DONE } state;
+  } * contexts_;
+  ::grpc::testing::EchoTestService::AsyncService service_;
+  std::unique_ptr<ServerCompletionQueue> cq_;
+  bool shutting_down_;
+  mutex mu_;
+  std::vector<std::thread*> server_threads_;
+};
+
+template <class Common>
 class End2endTest : public ::testing::Test {
  protected:
   End2endTest() {}
@@ -214,7 +326,7 @@ class End2endTest : public ::testing::Test {
   void TearDown() GRPC_OVERRIDE { common_.TearDown(); }
   void ResetStub() { common_.ResetStub(); }
 
-  CommonStressTest common_;
+  Common common_;
 };
 
 static void SendRpc(grpc::testing::EchoTestService::Stub* stub, int num_rpcs) {
@@ -230,11 +342,16 @@ static void SendRpc(grpc::testing::EchoTestService::Stub* stub, int num_rpcs) {
   }
 }
 
-TEST_F(End2endTest, ThreadStress) {
-  common_.ResetStub();
+typedef ::testing::Types<CommonStressTestSyncServer,
+                         CommonStressTestAsyncServer>
+    CommonTypes;
+TYPED_TEST_CASE(End2endTest, CommonTypes);
+TYPED_TEST(End2endTest, ThreadStress) {
+  this->common_.ResetStub();
   std::vector<std::thread*> threads;
   for (int i = 0; i < kNumThreads; ++i) {
-    threads.push_back(new std::thread(SendRpc, common_.GetStub(), kNumRpcs));
+    threads.push_back(
+        new std::thread(SendRpc, this->common_.GetStub(), kNumRpcs));
   }
   for (int i = 0; i < kNumThreads; ++i) {
     threads[i]->join();
@@ -242,6 +359,7 @@ TEST_F(End2endTest, ThreadStress) {
   }
 }
 
+template <class Common>
 class AsyncClientEnd2endTest : public ::testing::Test {
  protected:
   AsyncClientEnd2endTest() : rpcs_outstanding_(0) {}
@@ -309,31 +427,33 @@ class AsyncClientEnd2endTest : public ::testing::Test {
     }
   }
 
-  CommonStressTest common_;
+  Common common_;
   CompletionQueue cq_;
   mutex mu_;
   condition_variable cv_;
   int rpcs_outstanding_;
 };
 
-TEST_F(AsyncClientEnd2endTest, ThreadStress) {
-  common_.ResetStub();
+TYPED_TEST_CASE(AsyncClientEnd2endTest, CommonTypes);
+TYPED_TEST(AsyncClientEnd2endTest, ThreadStress) {
+  this->common_.ResetStub();
   std::vector<std::thread *> send_threads, completion_threads;
   for (int i = 0; i < kNumAsyncReceiveThreads; ++i) {
     completion_threads.push_back(new std::thread(
-        &AsyncClientEnd2endTest_ThreadStress_Test::AsyncCompleteRpc, this));
+        &AsyncClientEnd2endTest_ThreadStress_Test<TypeParam>::AsyncCompleteRpc,
+        this));
   }
   for (int i = 0; i < kNumAsyncSendThreads; ++i) {
-    send_threads.push_back(
-        new std::thread(&AsyncClientEnd2endTest_ThreadStress_Test::AsyncSendRpc,
-                        this, kNumRpcs));
+    send_threads.push_back(new std::thread(
+        &AsyncClientEnd2endTest_ThreadStress_Test<TypeParam>::AsyncSendRpc,
+        this, kNumRpcs));
   }
   for (int i = 0; i < kNumAsyncSendThreads; ++i) {
     send_threads[i]->join();
     delete send_threads[i];
   }
 
-  Wait();
+  this->Wait();
   for (int i = 0; i < kNumAsyncReceiveThreads; ++i) {
     completion_threads[i]->join();
     delete completion_threads[i];
diff --git a/test/distrib/node/run_distrib_test.sh b/test/distrib/node/run_distrib_test.sh
index 9b8f15771b8..13a42fcb0a2 100755
--- a/test/distrib/node/run_distrib_test.sh
+++ b/test/distrib/node/run_distrib_test.sh
@@ -28,23 +28,31 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+function finish() {
+  rv=$?
+  kill $STATIC_PID || true
+  curl "localhost:32767/drop/$STATIC_PORT" || true
+  exit $rv
+}
+
+trap finish EXIT
+
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 cd $(dirname $0)
 
 nvm install $NODE_VERSION
+set -ex
 
 npm install -g node-static
 
-# Kill off existing static servers
-kill -9 $(ps aux | grep '[n]ode .*static' | awk '{print $2}') || true
-
 STATIC_SERVER=127.0.0.1
-STATIC_PORT=8080
+# If port_server is running, get port from that. Otherwise, assume we're in
+# docker and use 8080
+STATIC_PORT=$(curl 'localhost:32767/get' || echo '8080')
 
-# Serves the input_artifacts directory statically at localhost:8080
+# Serves the input_artifacts directory statically at localhost:
 static "$EXTERNAL_GIT_ROOT/input_artifacts" -a $STATIC_SERVER -p $STATIC_PORT &
 STATIC_PID=$!
 
@@ -52,6 +60,4 @@ STATIC_URL="http://$STATIC_SERVER:$STATIC_PORT/"
 
 npm install --unsafe-perm $STATIC_URL/grpc.tgz --grpc_node_binary_host_mirror=$STATIC_URL
 
-kill -9 $STATIC_PID
-
 ./distrib_test.js
diff --git a/tools/run_tests/build_artifact_node.sh b/tools/run_tests/build_artifact_node.sh
index 6aa48245383..ef3476a0381 100755
--- a/tools/run_tests/build_artifact_node.sh
+++ b/tools/run_tests/build_artifact_node.sh
@@ -30,9 +30,9 @@
 
 NODE_TARGET_ARCH=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use 4
+set -ex
 
 cd $(dirname $0)/../..
 
diff --git a/tools/run_tests/build_artifact_python.sh b/tools/run_tests/build_artifact_python.sh
index 7ba04d75463..1f23f9fade8 100755
--- a/tools/run_tests/build_artifact_python.sh
+++ b/tools/run_tests/build_artifact_python.sh
@@ -35,15 +35,18 @@ cd $(dirname $0)/../..
 if [ "$SKIP_PIP_INSTALL" == "" ]
 then
   pip install --upgrade six
-  pip install --upgrade setuptools
+  # There's a bug in newer versions of setuptools (see
+  # https://bitbucket.org/pypa/setuptools/issues/503/pkg_resources_vendorpackagingrequirementsi)
+  pip install --upgrade 'setuptools==18'
   pip install -rrequirements.txt
 fi
 
+export GRPC_PYTHON_USE_CUSTOM_BDIST=0
+export GRPC_PYTHON_BUILD_WITH_CYTHON=1
+
 # Build the source distribution first because MANIFEST.in cannot override
 # exclusion of built shared objects among package resources (for some
 # inexplicable reason).
-GRPC_PYTHON_USE_CUSTOM_BDIST=0  \
-GRPC_PYTHON_BUILD_WITH_CYTHON=1 \
 ${SETARCH_CMD} python setup.py  \
     sdist
 
@@ -51,15 +54,11 @@ ${SETARCH_CMD} python setup.py  \
 # and thus ought to be run in a shell command separate of others. Further, it
 # trashes the actual bdist_wheel output, so it should be run first so that
 # bdist_wheel may be run unmolested.
-GRPC_PYTHON_USE_CUSTOM_BDIST=0  \
-GRPC_PYTHON_BUILD_WITH_CYTHON=1 \
 ${SETARCH_CMD} python setup.py  \
     build_tagged_ext
 
 # Wheel has a bug where directories don't get excluded.
 # https://bitbucket.org/pypa/wheel/issues/99/cannot-exclude-directory
-GRPC_PYTHON_USE_CUSTOM_BDIST=0  \
-GRPC_PYTHON_BUILD_WITH_CYTHON=1 \
 ${SETARCH_CMD} python setup.py  \
     bdist_wheel
 
diff --git a/tools/run_tests/build_node.sh b/tools/run_tests/build_node.sh
index 9c4af071856..cbe0e31d2eb 100755
--- a/tools/run_tests/build_node.sh
+++ b/tools/run_tests/build_node.sh
@@ -31,9 +31,9 @@
 
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use $NODE_VERSION
+set -ex
 
 CONFIG=${CONFIG:-opt}
 
diff --git a/tools/run_tests/build_package_node.sh b/tools/run_tests/build_package_node.sh
index aca90a37500..540c8263117 100755
--- a/tools/run_tests/build_package_node.sh
+++ b/tools/run_tests/build_package_node.sh
@@ -29,9 +29,9 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use 4
+set -ex
 
 cd $(dirname $0)/../..
 
diff --git a/tools/run_tests/pre_build_node.sh b/tools/run_tests/pre_build_node.sh
index 11f46d60fc2..1f55df0b7bc 100755
--- a/tools/run_tests/pre_build_node.sh
+++ b/tools/run_tests/pre_build_node.sh
@@ -31,9 +31,9 @@
 
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use $NODE_VERSION
+set -ex
 
 export GRPC_CONFIG=${CONFIG:-opt}
 
diff --git a/tools/run_tests/run_node.sh b/tools/run_tests/run_node.sh
index d33890068dd..b94dc3ec628 100755
--- a/tools/run_tests/run_node.sh
+++ b/tools/run_tests/run_node.sh
@@ -30,9 +30,9 @@
 
 NODE_VERSION=$1
 source ~/.nvm/nvm.sh
-set -ex
 
 nvm use $NODE_VERSION
+set -ex
 
 CONFIG=${CONFIG:-opt}
 
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index a9438045aa6..6b84daea544 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -120,7 +120,12 @@ def get_c_tests(travis, test_lang) :
 
 def _check_compiler(compiler, supported_compilers):
   if compiler not in supported_compilers:
-    raise Exception('Compiler %s not supported.' % compiler)
+    raise Exception('Compiler %s not supported (on this platform).' % compiler)
+
+
+def _check_arch(arch, supported_archs):
+  if arch not in supported_archs:
+    raise Exception('Architecture %s not supported.' % arch)
 
 
 def _is_use_docker_child():
@@ -464,7 +469,19 @@ class CSharpLanguage(object):
   def configure(self, config, args):
     self.config = config
     self.args = args
-    _check_compiler(self.args.compiler, ['default'])
+    if self.platform == 'windows':
+      # Explicitly choosing between x86 and x64 arch doesn't work yet
+      _check_arch(self.args.arch, ['default'])
+      self._make_options = [_windows_toolset_option(self.args.compiler),
+                            _windows_arch_option(self.args.arch)]
+    else:
+      _check_compiler(self.args.compiler, ['default'])
+      if self.platform == 'mac':
+        # On Mac, official distribution of mono is 32bit.
+        self._make_options = ['EMBED_OPENSSL=true', 'EMBED_ZLIB=true',
+                              'CFLAGS=-arch i386', 'LDFLAGS=-arch i386']
+      else:
+        self._make_options = ['EMBED_OPENSSL=true', 'EMBED_ZLIB=true']
 
   def test_specs(self):
     with open('src/csharp/tests.json') as f:
@@ -511,23 +528,16 @@ class CSharpLanguage(object):
       return [['tools/run_tests/pre_build_csharp.sh']]
 
   def make_targets(self):
-    # For Windows, this target doesn't really build anything,
-    # everything is build by buildall script later.
-    if self.platform == 'windows':
-      return []
-    else:
-      return ['grpc_csharp_ext']
+    return ['grpc_csharp_ext']
 
   def make_options(self):
-    if self.platform == 'mac':
-      # On Mac, official distribution of mono is 32bit.
-      return ['CFLAGS=-arch i386', 'LDFLAGS=-arch i386']
-    else:
-      return []
+    return self._make_options;
 
   def build_steps(self):
     if self.platform == 'windows':
-      return [['src\\csharp\\buildall.bat']]
+      return [[_windows_build_bat(self.args.compiler),
+               'src/csharp/Grpc.sln',
+               '/p:Configuration=%s' % _MSBUILD_CONFIG[self.config.build_config]]]
     else:
       return [['tools/run_tests/build_csharp.sh']]
 
diff --git a/vsprojects/build_vs2010.bat b/vsprojects/build_vs2010.bat
index 64b0ed5d3f5..1bc3c86a92f 100644
--- a/vsprojects/build_vs2010.bat
+++ b/vsprojects/build_vs2010.bat
@@ -1,5 +1,5 @@
 @rem Convenience wrapper that runs specified gRPC target using msbuild
-@rem Usage: build.bat TARGET_NAME
+@rem Usage: build_vs2010.bat TARGET_NAME
 
 setlocal
 @rem Set VS variables (uses Visual Studio 2010)
diff --git a/vsprojects/build_vs2013.bat b/vsprojects/build_vs2013.bat
index be3caa9298c..82c0a3ad824 100644
--- a/vsprojects/build_vs2013.bat
+++ b/vsprojects/build_vs2013.bat
@@ -1,5 +1,5 @@
 @rem Convenience wrapper that runs specified gRPC target using msbuild
-@rem Usage: build.bat TARGET_NAME
+@rem Usage: build_vs2013.bat TARGET_NAME
 
 setlocal
 @rem Set VS variables (uses Visual Studio 2013)
diff --git a/vsprojects/build_vs2015.bat b/vsprojects/build_vs2015.bat
index 50485a30f30..c6e1b433a3e 100644
--- a/vsprojects/build_vs2015.bat
+++ b/vsprojects/build_vs2015.bat
@@ -1,5 +1,5 @@
 @rem Convenience wrapper that runs specified gRPC target using msbuild
-@rem Usage: build.bat TARGET_NAME
+@rem Usage: build_vs2015.bat TARGET_NAME
 
 setlocal
 @rem Set VS variables (uses Visual Studio 2015)