diff --git a/tests/ifaddrs_test.cpp b/tests/ifaddrs_test.cpp
index 9f01619..4b9d4d8 100644
--- a/tests/ifaddrs_test.cpp
+++ b/tests/ifaddrs_test.cpp
@@ -19,6 +19,7 @@
 #include <ifaddrs.h>
 
 #include <dirent.h>
+#include <fcntl.h>
 #include <linux/if_packet.h>
 #include <net/ethernet.h>
 #include <net/if.h>
@@ -28,6 +29,7 @@
 
 #include <algorithm>
 #include <map>
+#include <thread>
 #include <vector>
 
 TEST(ifaddrs, freeifaddrs_null) {
@@ -267,3 +269,40 @@
 
   freeifaddrs(addrs);
 }
+
+TEST(ifaddrs, kernel_bug_31038971) {
+  // Some kernels had a bug that would lead to an NLMSG_ERROR response,
+  // but bionic wasn't setting errno based on the value in the message.
+  // This is the test for the kernel bug, but on a device with a bad
+  // kernel this test was also useful for testing the bionic errno fix.
+  std::vector<std::thread*> threads;
+  for (size_t i = 0; i < 128; ++i) {
+    threads.push_back(new std::thread([]() {
+      ifaddrs* addrs = nullptr;
+      ASSERT_EQ(0, getifaddrs(&addrs)) << strerror(errno);
+      freeifaddrs(addrs);
+    }));
+  }
+  for (auto& t : threads) {
+    t->join();
+    delete t;
+  }
+}
+
+TEST(ifaddrs, errno_EMFILE) {
+  std::vector<int> fds;
+  while (true) {
+    int fd = open("/dev/null", O_RDONLY|O_CLOEXEC);
+    if (fd == -1) {
+      ASSERT_EQ(EMFILE, errno);
+      break;
+    }
+    fds.push_back(fd);
+  }
+
+  ifaddrs* addrs;
+  EXPECT_EQ(-1, getifaddrs(&addrs));
+  EXPECT_EQ(EMFILE, errno);
+
+  for (int fd : fds) close(fd);
+}