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krb5-18.2: MDB_BAD_RSLOT: Invalid reuse of reader locktable slot

daemon@ATHENA.MIT.EDU (rachit chokshi)
Thu Jun 18 04:56:19 2020

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From: rachit chokshi <rachitchokshi@gmail.com>
Date: Thu, 18 Jun 2020 01:53:36 -0700
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Hello,
I was trying out the latest release hoping to reap the benefits of LMDB for
our systems. However each time I start krb5kdc and kadmin processes
separately (one after another/at a different point in time) I see below in
krb5kdc logs.

*LMDB read failure (path: /var/kerberos/krb5kdc/principal.mdb):
MDB_BAD_RSLOT: Invalid reuse of reader locktable slot*

This problem goes away when i restart both services at the same time by
doing "*systemctl restart kadmin krb5kdc*". However if any of them is
individually restarted later, the above error starts showing up again.

i can post my conf files but this is a vanilla setup with only the "
*[dbmodules]"* section added to *kdc.conf*, rest all is default. The distro
I am using is fedora rawhide.

If anybody has seen this, pointers in the correct direction are greatly
appreciated. TIA :)

Regards,
Rachit
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