NFD » ndn-cxx

On a freshly installed FreeBSD 10.1 slave, I'm getting the following unit test failures:

vagrant@freebsd-10 /usr/home/vagrant/ndn-cxx]$ ./build/unit-tests
Running 615 test cases...
unknown location(0): fatal error in "EndToEnd": signal: subscript out of range; address of failing instruction: 0x087709cc
../tests/unit-tests/util/notification-subscriber.t.cpp(65): last checkpoint
unknown location(0): fatal error in "DeprecatedExpressInterestData": memory access violation at address: 0x00000017: no mapping at fault address
../tests/unit-tests/face.t.cpp(96): last checkpoint

*** 2 failures detected in test suite "ndn-cxx Unit Tests"```

I tracked down that both of these errors are related to Face::expressInterest(const Interest& interest, const OnData& onData, const OnTimeout& onTimeout). In particular, it seemed that onData callback (in the failed cases, a lambda is supplied) is not copied by value, even though it is requested...

If I apply the following patch, which per my understanding shouldn't change anything, the failure goes away:

diff --git a/src/face.cpp b/src/face.cpp
index 9d6b0dd..72dcdba 100644
--- a/src/face.cpp
+++ b/src/face.cpp
@@ -155,9 +155,10 @@ Face::expressInterest(const Interest& interest,

 const PendingInterestId*
 Face::expressInterest(const Interest& interest,
-                      const OnData& onData,
+                      const OnData& onData1,
                       const OnTimeout& onTimeout)
 {
+  OnData onData = onData1;
   return this->expressInterest(
     interest,
     [onData] (const Interest& interest, const Data& data) {

Is it a clang bug? Or something wrong with the way we use lambdas?

Few system parameters:

• FreeBSD 10.1 32bit:

  • FreeBSD freebsd-10.1-i386 10.1-RELEASE FreeBSD 10.1-RELEASE #0 r274401: Tue Nov 11 22:51:51 UTC 2014 [email protected]:/usr/obj/usr/src/sys/GENERIC i386
  • FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512

• FreeBSD 10.2 64bit:

  • FreeBSD 10.2-RELEASE-p7 FreeBSD 10.2-RELEASE-p7 #0: Mon Nov 2 14:19:39 UTC 2015 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64
  • FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512