From bf5f1b659729dde0378a867ce21426c09490d518 Mon Sep 17 00:00:00 2001
From: Julian Büning <julian.buening@rwth-aachen.de>
Date: Sun, 30 Jul 2017 18:37:08 +0200
Subject: Fixed assert in BFSSearcher that does not hold as part of interleaved
 searcher

---
 lib/Core/Searcher.cpp                              |  5 ++-
 .../Feature/BFSSearcherAndDFSSearcherInterleaved.c | 49 ++++++++++++++++++++++
 2 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 test/Feature/BFSSearcherAndDFSSearcherInterleaved.c

diff --git a/lib/Core/Searcher.cpp b/lib/Core/Searcher.cpp
index fc61ab98..d5d35e8f 100644
--- a/lib/Core/Searcher.cpp
+++ b/lib/Core/Searcher.cpp
@@ -104,8 +104,9 @@ void BFSSearcher::update(ExecutionState *current,
   if (!addedStates.empty() && current &&
       std::find(removedStates.begin(), removedStates.end(), current) ==
           removedStates.end()) {
-    assert(states.front() == current);
-    states.pop_front();
+    auto pos = std::find(states.begin(), states.end(), current);
+    assert(pos != states.end());
+    states.erase(pos);
     states.push_back(current);
   }
 
diff --git a/test/Feature/BFSSearcherAndDFSSearcherInterleaved.c b/test/Feature/BFSSearcherAndDFSSearcherInterleaved.c
new file mode 100644
index 00000000..9cc11b70
--- /dev/null
+++ b/test/Feature/BFSSearcherAndDFSSearcherInterleaved.c
@@ -0,0 +1,49 @@
+// RUN: %llvmgcc %s -emit-llvm -g -c -o %t.bc
+// RUN: rm -rf %t-bfs.klee-out
+// RUN: rm -rf %t-dfs.klee-out
+// RUN: rm -rf %t-bfs-dfs.klee-out
+// RUN: rm -rf %t-dfs-bfs.klee-out
+// RUN: %klee -output-dir=%t-bfs.klee-out -search=bfs %t.bc >%t-bfs.out
+// RUN: %klee -output-dir=%t-dfs.klee-out -search=dfs %t.bc >%t-dfs.out
+// RUN: %klee -output-dir=%t-bfs-dfs.klee-out -search=bfs -search=dfs %t.bc >%t-bfs-dfs.out
+// RUN: %klee -output-dir=%t-dfs-bfs.klee-out -search=dfs -search=bfs %t.bc >%t-dfs-bfs.out
+// RUN: FileCheck -input-file=%t-bfs.out %s
+// RUN: FileCheck -input-file=%t-dfs.out %s
+// RUN: FileCheck -input-file=%t-bfs-dfs.out %s
+// RUN: FileCheck -input-file=%t-dfs-bfs.out %s
+
+#include "klee/klee.h"
+
+int main() {
+  int x, y, z;
+  klee_make_symbolic(&x, sizeof(x), "x");
+  klee_make_symbolic(&y, sizeof(y), "y");
+  klee_make_symbolic(&z, sizeof(z), "z");
+
+  if (x == 1) {
+    if (y == 1) {
+      if (z == 1) {
+        printf("A");
+      } else {
+        printf("B");
+      }
+    }
+  } else {
+    if (y == 1) {
+      if (z == 1) {
+        printf("C");
+      } else {
+        printf("D");
+      }
+    }
+  }
+
+  // exactly 4 characters
+  // CHECK: {{^[A-D]{4}$}}
+
+  // for each of A, B, C and D: occurs exactly once
+  // CHECK-SAME: {{^[B-D]*A[B-D]*$}}
+  // CHECK-SAME: {{^[A,C-D]*B[A,C-D]*$}}
+  // CHECK-SAME: {{^[A-B,D]*C[A-B,D]*$}}
+  // CHECK-SAME: {{^[A-C]*D[A-C]*$}}
+}
-- 
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