Entries that belong to the base index should not be freed. Mark
CE_REMOVE to track them.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 read-cache.c  | 14 ++++++++------
 split-index.c | 12 ++++++++++++
 split-index.h |  1 +
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 52a27b3..c437585 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -39,7 +39,7 @@ static struct cache_entry *refresh_cache_entry(struct 
cache_entry *ce,
 
 /* changes that can be kept in $GIT_DIR/index (basically all extensions) */
 #define EXTMASK (RESOLVE_UNDO_CHANGED | CACHE_TREE_CHANGED | \
-                CE_ENTRY_ADDED)
+                CE_ENTRY_ADDED | CE_ENTRY_REMOVED)
 
 struct index_state the_index;
 static const char *alternate_index_output;
@@ -488,7 +488,7 @@ int remove_index_entry_at(struct index_state *istate, int 
pos)
 
        record_resolve_undo(istate, ce);
        remove_name_hash(istate, ce);
-       free(ce);
+       save_or_free_index_entry(istate, ce);
        istate->cache_changed |= CE_ENTRY_REMOVED;
        istate->cache_nr--;
        if (pos >= istate->cache_nr)
@@ -512,7 +512,7 @@ void remove_marked_cache_entries(struct index_state *istate)
        for (i = j = 0; i < istate->cache_nr; i++) {
                if (ce_array[i]->ce_flags & CE_REMOVE) {
                        remove_name_hash(istate, ce_array[i]);
-                       free(ce_array[i]);
+                       save_or_free_index_entry(istate, ce_array[i]);
                }
                else
                        ce_array[j++] = ce_array[i];
@@ -577,7 +577,9 @@ static int different_name(struct cache_entry *ce, struct 
cache_entry *alias)
  * So we use the CE_ADDED flag to verify that the alias was an old
  * one before we accept it as
  */
-static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct 
cache_entry *alias)
+static struct cache_entry *create_alias_ce(struct index_state *istate,
+                                          struct cache_entry *ce,
+                                          struct cache_entry *alias)
 {
        int len;
        struct cache_entry *new;
@@ -590,7 +592,7 @@ static struct cache_entry *create_alias_ce(struct 
cache_entry *ce, struct cache_
        new = xcalloc(1, cache_entry_size(len));
        memcpy(new->name, alias->name, len);
        copy_cache_entry(new, ce);
-       free(ce);
+       save_or_free_index_entry(istate, ce);
        return new;
 }
 
@@ -683,7 +685,7 @@ int add_to_index(struct index_state *istate, const char 
*path, struct stat *st,
                set_object_name_for_intent_to_add_entry(ce);
 
        if (ignore_case && alias && different_name(ce, alias))
-               ce = create_alias_ce(ce, alias);
+               ce = create_alias_ce(istate, ce, alias);
        ce->ce_flags |= CE_ADDED;
 
        /* It was suspected to be racily clean, but it turns out to be Ok */
diff --git a/split-index.c b/split-index.c
index 63b52bb..2bb5d55 100644
--- a/split-index.c
+++ b/split-index.c
@@ -88,3 +88,15 @@ void discard_split_index(struct index_state *istate)
        }
        free(si);
 }
+
+void save_or_free_index_entry(struct index_state *istate, struct cache_entry 
*ce)
+{
+       if (ce->index &&
+           istate->split_index &&
+           istate->split_index->base &&
+           ce->index <= istate->split_index->base->cache_nr &&
+           ce == istate->split_index->base->cache[ce->index - 1])
+               ce->ce_flags |= CE_REMOVE;
+       else
+               free(ce);
+}
diff --git a/split-index.h b/split-index.h
index 8d74041..5302118 100644
--- a/split-index.h
+++ b/split-index.h
@@ -12,6 +12,7 @@ struct split_index {
 };
 
 struct split_index *init_split_index(struct index_state *istate);
+void save_or_free_index_entry(struct index_state *istate, struct cache_entry 
*ce);
 int read_link_extension(struct index_state *istate,
                        const void *data, unsigned long sz);
 int write_link_extension(struct strbuf *sb,
-- 
1.9.1.346.ga2b5940

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