resolved the conflict in glibc_build.sh

added a reference to background section
logged freeing the third large chunk

glibc_2.25/large_bin_attack.c

@@ -22,6 +22,9 @@
     fwd->bk = victim;
     bck->fd = victim;
 
+    For more details on how large-bins are handled and sorted by ptmalloc,
+    please check the Background section in the aforementioned link.
+
     [...]
 
  */
@@ -66,15 +69,17 @@ int main()
     free(p1);
     free(p2);
     fprintf(stderr, "We free the first and second large chunks now and they will be inserted in the unsorted bin:"
-           " %p --> %p\n\n", (void *)(p2 - 2), (void *)(p1 - 2));
+           " [ %p <--> %p ]\n\n", (void *)(p2 - 2), (void *)(p2[0]));
 
     malloc(0x90);
     fprintf(stderr, "Now, we allocate a chunk with a size smaller than the freed first large chunk. This will move the"
             " freed second large chunk into the large bin freelist, use parts of the freed first large chunk for allocation"
             ", and reinsert the remaining of the freed first large chunk into the unsorted bin:"
-            " %p\n\n", (void *)((char *)p1 + 0x90));
+            " [ %p ]\n\n", (void *)((char *)p1 + 0x90));
 
     free(p3);
+    fprintf(stderr, "Now, we free the third large chunk and it will be inserted in the unsorted bin:"
+           " [ %p <--> %p ]\n\n", (void *)(p3 - 2), (void *)(p3[0]));
 
     //------------VULNERABILITY-----------
 

glibc_2.26/large_bin_attack.c

@@ -22,6 +22,9 @@
     fwd->bk = victim;
     bck->fd = victim;
 
+    For more details on how large-bins are handled and sorted by ptmalloc,
+    please check the Background section in the aforementioned link.
+
     [...]
 
  */
@@ -67,15 +70,17 @@ int main()
     free(p1);
     free(p2);
     fprintf(stderr, "We free the first and second large chunks now and they will be inserted in the unsorted bin:"
-           " %p --> %p\n\n", (void *)(p2 - 2), (void *)(p1 - 2));
+           " [ %p <--> %p ]\n\n", (void *)(p2 - 2), (void *)(p2[0]));
 
     malloc(0x90);
     fprintf(stderr, "Now, we allocate a chunk with a size smaller than the freed first large chunk. This will move the"
             " freed second large chunk into the large bin freelist, use parts of the freed first large chunk for allocation"
             ", and reinsert the remaining of the freed first large chunk into the unsorted bin:"
-            " %p\n\n", (void *)((char *)p1 + 0x90));
+            " [ %p ]\n\n", (void *)((char *)p1 + 0x90));
 
     free(p3);
+    fprintf(stderr, "Now, we free the third large chunk and it will be inserted in the unsorted bin:"
+           " [ %p <--> %p ]\n\n", (void *)(p3 - 2), (void *)(p3[0]));
 
     //------------VULNERABILITY-----------
 

glibc_build.sh

@@ -20,7 +20,7 @@ else
 fi
 
 # Checkout release
-git rev-parse --verify --quiet "origin/release/$1/master"
+git rev-parse --verify --quiet "refs/remotes/origin/release/$1/master"
 if [[ $? != 0 ]]; then
     echo "Error: Glibc version does not seem to exists"
     exit 1