xramtsov@gmail.com wrote:

Full_Name: Evgeny Khramtsov Version: LMDB 0.9.10 OS: Debian Linux 3.10-3-amd64 SMP URL: http://kuku.jabber.ru/~xram/lmdb_bug.tar.gz Submission from: (NULL) (198.211.126.52)

The way to reproduce the crash:

1. Write lots of key/vals such as "0", "1", "2", ..., "5000000" (all are "", but

this is irrelevant). 2) Delete them in the same order. 3) Get: mdb.c:4682: mdb_page_search_root: Assertion `(((mp)->mp_pb.pb.pb_lower - ((unsigned) __builtin_offsetof (MDB_page, mp_ptrs))) >> 1) > 1' failed.

On the url there is an example program reproducing the bug. Unpack the tarball: $ tar -xzf lmdb_bug.tar.gz $ cd lmdb_bug $ make $ ./bug /path/to/some/non_existent/dir

Thanks for the report. This is now fixed in git mdb.master.