Fix profile_flush_to_file() state corruption

In write_data_to_file(), do not clear the profile data object's flags.
If the call to this function resulted from profile_flush_to_file(), we
do not want to clear the DIRTY flag, and we especially do not want to
clear the SHARED flag for a data object which is part of
g_shared_trees.  Instead, clear the DIRTY flag in
profile_flush_file_data().

Add a test case to prof_test1 to exercise the bug in unfixed code.
Also modify test1 to abandon the altered profile after flushing it to
a file, to preserve the external behavior of the script before this
fix.

(cherry picked from commit 32a0599)

ticket: 8431
version_fixed: 1.14.3

src/util/profile/prof_file.c

@@ -473,7 +473,6 @@ static errcode_t write_data_to_file(prf_data_t data, const char *outfile,
         }
     }
 
-    data->flags = 0;
     retval = 0;
 
 errout:
@@ -509,6 +508,7 @@ errcode_t profile_flush_file_data(prf_data_t data)
     }
 
     retval = write_data_to_file(data, data->filespec, 0);
+    data->flags &= ~PROFILE_FILE_DIRTY;
     k5_mutex_unlock(&data->lock);
     return retval;
 }

src/util/profile/prof_test1

@@ -40,7 +40,7 @@ proc test1 {} {
     #profile_iterator_free $iter
     catch {file delete $wd/test3.ini}
     profile_flush_to_file $p $wd/test3.ini
-    profile_release $p
+    profile_abandon $p
 
     if $verbose { puts "Reloading new profile" }
     set p [profile_init_path $wd/test3.ini]
@@ -315,6 +315,25 @@ proc test8 {} {
     puts "OK: test8: relation order in the presence of deletions"
 }
 
+proc test9 {} {
+    global wd verbose
+
+    # Regression test for #8431: profile_flush_to_file erroneously
+    # cleared the DIRTY and SHARED flags from the data object, which
+    # could lead to a dangling reference in g_shared_trees on release.
+    set p [profile_init_path $wd/test2.ini]
+    catch {file delete $wd/test3.ini}
+    profile_flush_to_file $p $wd/test3.ini
+    profile_release $p
+
+    # If a dangling reference was created in g_shared_trees, the next
+    # profile open will trigger an assertion failure.
+    set p [profile_init_path $wd/test2.ini]
+    profile_release $p
+
+    puts "OK: test9: profile_flush_to_file with no changes"
+}
+
 test1
 test2
 test3
@@ -323,5 +342,6 @@ test5
 test6
 test7
 test8
+test9
 
 exit 0