diff --git a/test/libc/intrin/pthread_mutex_lock_test.c b/test/libc/intrin/pthread_mutex_lock_test.c
index ffecfe9f7b4..0a5514a983e 100644
--- a/test/libc/intrin/pthread_mutex_lock_test.c
+++ b/test/libc/intrin/pthread_mutex_lock_test.c
@@ -197,28 +197,27 @@ TEST(pthread_mutex_lock, rcontention) {
   EXPECT_EQ(0, pthread_mutex_destroy(&mylock));
 }
 
-/* TEST(pthread_mutex_lock, econtention) { */
-/*   int i; */
-/*   pthread_mutexattr_t attr; */
-/*   pthread_mutexattr_init(&attr); */
-/*   pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK); */
-/*   pthread_mutex_init(&mylock, &attr); */
-/*   pthread_mutexattr_destroy(&attr); */
-/*   count = 0; */
-/*   started = 0; */
-/*   finished = 0; */
-/*   for (i = 0; i < THREADS; ++i) { */
-/*     ASSERT_NE(-1, pthread_create(th + i, 0, MutexWorker, (void
- * *)(intptr_t)i)); */
-/*   } */
-/*   for (i = 0; i < THREADS; ++i) { */
-/*     pthread_join(th[i], 0); */
-/*   } */
-/*   EXPECT_EQ(THREADS, started); */
-/*   EXPECT_EQ(THREADS, finished); */
-/*   EXPECT_EQ(THREADS * ITERATIONS, count); */
-/*   EXPECT_EQ(0, pthread_mutex_destroy(&mylock)); */
-/* } */
+TEST(pthread_mutex_lock, econtention) {
+  int i;
+  pthread_mutexattr_t attr;
+  pthread_mutexattr_init(&attr);
+  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
+  pthread_mutex_init(&mylock, &attr);
+  pthread_mutexattr_destroy(&attr);
+  count = 0;
+  started = 0;
+  finished = 0;
+  for (i = 0; i < THREADS; ++i) {
+    ASSERT_NE(-1, pthread_create(th + i, 0, MutexWorker, (void *)(intptr_t)i));
+  }
+  for (i = 0; i < THREADS; ++i) {
+    pthread_join(th[i], 0);
+  }
+  EXPECT_EQ(THREADS, started);
+  EXPECT_EQ(THREADS, finished);
+  EXPECT_EQ(THREADS * ITERATIONS, count);
+  EXPECT_EQ(0, pthread_mutex_destroy(&mylock));
+}
 
 void *SpinlockWorker(void *p) {
   int i;
diff --git a/test/libc/system/popen_test.c b/test/libc/system/popen_test.c
index ef37402b9a0..cf9a5d048c6 100644
--- a/test/libc/system/popen_test.c
+++ b/test/libc/system/popen_test.c
@@ -159,7 +159,7 @@ void *Worker(void *arg) {
 }
 
 TEST(popen, torture) {
-  int i, n = 40;
+  int i, n = 4;
   pthread_t *t = gc(malloc(sizeof(pthread_t) * n));
   testlib_extract("/zip/echo", "echo", 0755);
   for (i = 0; i < n; ++i)
diff --git a/test/libc/thread/pthread_cancel_deferred_cond_test.c b/test/libc/thread/pthread_cancel_deferred_cond_test.c
index 90d00b02964..4bba81a1838 100644
--- a/test/libc/thread/pthread_cancel_deferred_cond_test.c
+++ b/test/libc/thread/pthread_cancel_deferred_cond_test.c
@@ -13,7 +13,6 @@
 // TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 // PERFORMANCE OF THIS SOFTWARE.
 
-#include <cosmo.h>
 #include <errno.h>
 #include <pthread.h>
 #include <stdio.h>
@@ -38,7 +37,6 @@ void* worker(void* arg) {
 }
 
 int main(int argc, char* argv[]) {
-  ShowCrashReports();
   void* rc;
   pthread_t th;
   pthread_mutexattr_t at;
diff --git a/test/posix/file_offset_exec_test.c b/test/posix/file_offset_exec_test.c
index adbe1f6173a..aafc9061ae7 100644
--- a/test/posix/file_offset_exec_test.c
+++ b/test/posix/file_offset_exec_test.c
@@ -13,7 +13,6 @@
 // TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 // PERFORMANCE OF THIS SOFTWARE.
 
-#include <cosmo.h>
 #include <signal.h>
 #include <stdatomic.h>
 #include <stdio.h>
@@ -37,8 +36,6 @@ void on_unexpected_death(int sig) {
 }
 
 int main() {
-  GetSymbolTable();
-  ShowCrashReports();
   signal(SIGCHLD, on_unexpected_death);
 
   // extract test program
diff --git a/test/posix/interprocess_signaling_test.c b/test/posix/interprocess_signaling_test.c
index 08176da90df..d6372492e4a 100644
--- a/test/posix/interprocess_signaling_test.c
+++ b/test/posix/interprocess_signaling_test.c
@@ -13,7 +13,6 @@
 // TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 // PERFORMANCE OF THIS SOFTWARE.
 
-#include <cosmo.h>
 #include <signal.h>
 #include <stdatomic.h>
 #include <sys/mman.h>
@@ -27,8 +26,6 @@ void onsig(int sig) {
 
 int main(int argc, char *argv[]) {
 
-  ShowCrashReports();
-
   // create process shared memory
   got = mmap(0, 4, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
   if (got == MAP_FAILED)