diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 01858f2f..d150e609 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,24 +1,6 @@
 name: build
 on: [push, pull_request]
 jobs:
-  linux-capture:
-    runs-on: ubuntu-latest
-    name: linux capture
-    steps:
-    - uses: actions/checkout@v3
-    - name: Start tcpdump
-      run: |
-        sudo tcpdump -nn -i any port 123 or port 53 -w sntp.cap &
-        sleep 1
-    - name: test
-      run: make clean test IPV6=0 SSL= OPTS= V=4 TFLAGS=-DMG_ENABLE_POLL=1
-    - name: Upload capture
-      if: always()
-      run: |
-        sleep 1
-        sudo kill -2 $(pgrep tcpdump)
-        sleep 1
-        sudo curl -F "file=@sntp.cap" https://file.io/?expires=1w
   linux:
     runs-on: ubuntu-latest
     strategy:
@@ -55,7 +37,7 @@ jobs:
     - name: Install packages
       run: HOMEBREW_NO_AUTO_UPDATE=1 brew install jq mbedtls openssl
     - name: make
-      run: make test++ upload-coverage IPV6=0 ASAN_OPTIONS=
+      run: make test++ upload-coverage IPV6=0 ASAN_OPTIONS= TFLAGS=-DMG_ENABLE_POLL=1
     - name: openssl
       run: make test SSL=OPENSSL IPV6=0 ASAN_OPTIONS= OPENSSL=`echo /usr/local/Cellar/openssl*/*`
     - name: exports
diff --git a/Makefile b/Makefile
index 61c48ff7..ecfccaee 100644
--- a/Makefile
+++ b/Makefile
@@ -55,7 +55,7 @@ mg_prefix: mongoose.c mongoose.h
 
 # C++ build
 test++: CC = g++
-test++: C_WARN = -std=c++2a -Wno-shadow -Wno-missing-field-initializers -Wno-deprecated
+test++: C_WARN = -std=c++2a -Wno-vla -Wno-shadow -Wno-missing-field-initializers -Wno-deprecated
 test++: test
 
 musl: test
diff --git a/mongoose.c b/mongoose.c
index a4a7b304..967e8254 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -3875,7 +3875,6 @@ int64_t mg_sntp_parse(const unsigned char *buf, size_t len) {
   } else {
     MG_ERROR(("unexpected version: %d", version));
   }
-  if (res == -1) mg_hexdump(buf, len);
   return res;
 }
 
@@ -4415,9 +4414,7 @@ static void mg_iotest(struct mg_mgr *mgr, int ms) {
     }
   }
 
-  int res = poll(fds, n, ms);
-  MG_DEBUG(("n=%d ms=%d res=%d errno=%d", n, ms, res, errno));
-  if (res < 0) {
+  if (poll(fds, n, ms) < 0) {
     MG_ERROR(("poll failed, errno: %d", MG_SOCK_ERRNO));
   } else {
     n = 0;
@@ -4428,8 +4425,6 @@ static void mg_iotest(struct mg_mgr *mgr, int ms) {
         c->is_readable = (unsigned) (fds[n].revents & POLLIN ? 1 : 0);
         c->is_writable = (unsigned) (fds[n].revents & POLLOUT ? 1 : 0);
         if (mg_tls_pending(c) > 0) c->is_readable = 1;
-        MG_DEBUG(("  fd=%d events=%d revents=%d", fds[n].fd, fds[n].events,
-                  fds[n].revents));
         fds[n].revents = 0;
         n++;
       }
diff --git a/src/sntp.c b/src/sntp.c
index e0c801b5..f46682e8 100644
--- a/src/sntp.c
+++ b/src/sntp.c
@@ -25,7 +25,6 @@ int64_t mg_sntp_parse(const unsigned char *buf, size_t len) {
   } else {
     MG_ERROR(("unexpected version: %d", version));
   }
-  if (res == -1) mg_hexdump(buf, len);
   return res;
 }
 
diff --git a/src/sock.c b/src/sock.c
index b71e0841..f3ba793d 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -496,9 +496,7 @@ static void mg_iotest(struct mg_mgr *mgr, int ms) {
     }
   }
 
-  int res = poll(fds, n, ms);
-  MG_DEBUG(("n=%d ms=%d res=%d errno=%d", n, ms, res, errno));
-  if (res < 0) {
+  if (poll(fds, n, ms) < 0) {
     MG_ERROR(("poll failed, errno: %d", MG_SOCK_ERRNO));
   } else {
     n = 0;
@@ -509,8 +507,6 @@ static void mg_iotest(struct mg_mgr *mgr, int ms) {
         c->is_readable = (unsigned) (fds[n].revents & POLLIN ? 1 : 0);
         c->is_writable = (unsigned) (fds[n].revents & POLLOUT ? 1 : 0);
         if (mg_tls_pending(c) > 0) c->is_readable = 1;
-        MG_DEBUG(("  fd=%d events=%d revents=%d", fds[n].fd, fds[n].events,
-                  fds[n].revents));
         fds[n].revents = 0;
         n++;
       }
diff --git a/test/unit_test.c b/test/unit_test.c
index 54867eef..00dd1798 100644
--- a/test/unit_test.c
+++ b/test/unit_test.c
@@ -296,12 +296,13 @@ static void test_sntp_server(const char *url) {
   int64_t ms = 0;
   struct mg_mgr mgr;
   struct mg_connection *c = NULL;
+  int i;
 
   mg_mgr_init(&mgr);
   c = mg_sntp_connect(&mgr, url, sntp_cb, &ms);
   ASSERT(c != NULL);
   ASSERT(c->is_udp == 1);
-  for (int i = 0; i < 60 && ms == 0; i++) mg_mgr_poll(&mgr, 50);
+  for (i = 0; i < 60 && ms == 0; i++) mg_mgr_poll(&mgr, 50);
   MG_DEBUG(("server: %s, ms: %lld", url ? url : "(default)", ms));
   ASSERT(ms > 0);
   mg_mgr_free(&mgr);