Using the branch 'develop.'

I'm implementing a custom filesystem and catch this problem using code similar to ex_file_sytem.c. I'm wondering why there is 1 missing fs_directory_list_free?

When running ex_file_system, demo_fs_directory_list_free is not called because demo_fs_directory_list calls don't match the prefix so they all returned NULL. Not a problem there.

However, in order to see the problem, you need to change the code in demo_fs_directory_list() to always allocate entries even when there is no matching entries and count stay 0 (i.e. just so to see the missing free call), e.g.:

allocated = 10;
entries = calloc(allocated, sizeof(char*));
count = 0;

And put some printf statements in both demo_fs_directory_list() and demo_fs_directory_list_free(), you will find that there is a missing demo_fs_directory_list_free() call.

Here's the output with my printf statements showing the second WiredTigerPrepLog 0x1f26ef0 is not being freed.

demo_fs_directory_list WT_HOME/. WiredTigerTmplog 0x1f26260
demo_fs_directory_list_free 0x1f26260
demo_fs_directory_list WT_HOME/. WiredTigerPreplog 0x1f25a10
demo_fs_directory_list_free 0x1f25a10
demo_fs_directory_list WT_HOME/. WiredTigerLog 0x1f25a10
demo_fs_directory_list WT_HOME/. WiredTigerPreplog 0x1f26ef0
demo_fs_directory_list_free 0x1f25a10
demo_fs_directory_list WT_HOME/. WiredTigerPreplog 0x7f02180008e0
demo_fs_directory_list_free 0x7f02180008e0
demo_fs_directory_list WT_HOME/. WiredTigerLog 0x7f02180008e0
demo_fs_directory_list_free 0x7f02180008e0