At a minimum, all lmdb files need to be re-created with LMDB 1.0 (either
with mdb_dump | mdb_load, or in case of Postfix with postmap), but the
API changed as well. Arch Linux applied the following preliminary patch:
https://gitlab.archlinux.org/archlinux/packaging/packages/postfix/-/raw/e681aefda7f52d21c46d1768bd07c925eae30991/postfix-3.11.4-lmdb-1.0-compat.patch
... but may still end up rolling back to LMDB 0.9 due to other packages
(other than postfix) being broken as well.
Geert
On Sun, Jul 05, 2026 at 09:40:24 +0200, Michael Grimm via Postfix-users wrote:
> Hi,
>
> tl;dr this is not a postfix issue.
>
> I do want to point out: http://www.lmdb.tech/doc/upgrading.html
>
> I got bitten by this on FreeBSD and had had to fall back to lmdb 0.93.5
>
> I have been in the naive assumption that this shouldn't be an issue at
> all by just rebuilding my lmdb databases with 'postmap lmdb:TEST'
>
> But there are other issues with lmdb 1.0:
>
> test> ldd /usr/local/lib/postfix/* | grep lmdb
> /usr/local/lib/postfix/postfix-lmdb.so:
> liblmdb.so.1 => /usr/local/lib/liblmdb.so.1 (0x90234ff3000)
>
> test> la /usr/local/lib/liblmdb*
> -rw-r--r-- 1 root wheel uarch 137992 Jul 5 08:51 /usr/local/lib/liblmdb.a
> lrwxr-xr-x 1 root wheel uarch 14 Jul 5 08:51 /usr/local/lib/liblmdb.so
> -> liblmdb.so.1.0
> lrwxr-xr-x 1 root wheel uarch 14 Jul 5 08:51
> /usr/local/lib/liblmdb.so.1 -> liblmdb.so.1.0
> -rw-r--r-- 1 root wheel uarch 114040 Jul 5 08:51
> /usr/local/lib/liblmdb.so.1.0
>
> test> postmap lmdb:TEST
> postmap: fatal: error updating lmdb:TEST: MDB_BAD_TXN: Transaction must
> abort, has a child, or is invalid
>
> Well, I will stick with lmdb 0.9.35 for the time being or migrate to
> other database formats, instead.
>
> Regards,
> Michael
>
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