#790236 openssh-server: sshd segfaults afer many unsuccesfull login attempts

Package:
openssh-server
Source:
openssh
Description:
secure shell (SSH) server, for secure access from remote machines
Submitter:
Thomas Braun
Date:
2015-06-27 17:00:05 UTC
Severity:
normal
#790236#5
Date:
2015-06-27 16:57:13 UTC
From:
To:
Dear Maintainer,
yesterday my ssh server segfaulted with the following message:
[4868342.681831] sshd[3996]: segfault at 7fa8c721c6a0 ip
00007faac7259ddb sp 00007ffc696e59d0 error 4 in sshd[7faac7249000+7c000]

This happened never before and the machine is on 24/7 with a public
accessible ssh port.

Immediately before I have 10k entries in sshd.log which say
 Jun 26 23:04:30 localhost sshd[7994]: User root from XXX not allowed
because not listed in AllowUsers
 Jun 26 23:04:30 localhost sshd[7994]: input_userauth_request: invalid
user root [preauth]
 Jun 26 23:04:30 localhost sshd[7994]: Received disconnect from XXX: 11:
Bye Bye [preauth]

At that time neither the memory nor the disk was full.

My sshd.conf says
[...]
AllowUsers ... root@127.0.0.1 ...
PermitRootLogin without-password
[...]

Please tell me if I should provide more information.