dovecot - Nov 2013 - BUG: Authentication client sent unknown handshake command

Hi

After upgrading the kernel, everything is fine, except dovecot authentication.
I get this trange thing (data after REQUEST? changed just in case it 
contains anything sensitive):

Nov 29 16:56:01 volanges dovecot: auth: Error: BUG: Authentication client sent
unknown handshake command:
REQUEST?6970356762?616?6?235264ef69dbd1665538af54d12fdaea?session_pid=453?req...
Nov 29 16:56:01 volanges dovecot: imap: Error: Authentication server didn't
send valid SPID as expected: MECH   PLAIN   plaintext
Nov 29 16:56:01 volanges dovecot: imap: Error: Disconnected from auth server,
aborting (client-pid=161 client-id=1)
Nov 29 16:56:01 volanges dovecot: imap-login: Internal login failure (pid=161
id=1) (internal failure, 1 successful auths): user=<jdoe>, method=PLAIN,
rip=192.0.2.251, lip=192.0.2.10, mpid=453, TLS, TLSv1 with cipher AES128-SHA
(128/128 bits)

Reverting to the previous kernel fixed the problem, but I have not been 
able to spot what the problem was. Any idea?

-- 
Emmanuel Dreyfus
manu at netbsd.org

Emmanuel Dreyfus <manu at netbsd.org> wrote:
> Nov 29 16:56:01 volanges dovecot: auth: Error: BUG: Authentication client
> sent unknown handshake command:
> REQUEST?6970356762?616?6?235264ef69dbd1665538af54...
I have real trouble to debug that one. I had a look at
wiki2.dovecot.org/Design/AuthProtocol, and if I understand correctly,
the auth server receives data from the master where it awaits data from
the auth client.

That suggests some confusion with file descriptors somewhere. Where are
the pipe() invocation to create these two pipe sets?

-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu at netbsd.org

On 29.11.2013, at 18.54, Emmanuel Dreyfus <manu at netbsd.org> wrote:
> After upgrading the kernel, everything is fine, except dovecot
authentication.
> I get this trange thing (data after REQUEST? changed just in case it 
> contains anything sensitive):
> 
> Nov 29 16:56:01 volanges dovecot: auth: Error: BUG: Authentication client
sent unknown handshake command:
REQUEST?6970356762?616?6?235264ef69dbd1665538af54d12fdaea?session_pid=453?req...
I think net_getunixname() no longer works correctly. src/auth/main.c uses it to
figure out what each socket is.