[2.2.25 auth issue] auth-request.c: line 1049 (auth_request_lookup_credentials): assertion failed: (request->credentials_scheme == scheme)

[Alexey Asemov (Alex/AT)]

Hello,

Since updating to 2.2.25, we do have the following issue (seems to be 
related to the new auth policy code):

Jul  9 00:00:14 LXmail01 dovecot: auth-worker(6558): 
sql(user at domain.org,*.*.*.*,<wjpa7SY3nNFR8yTo>): unknown user
Jul  9 00:00:14 LXmail01 dovecot: auth: Panic: file auth-request.c: line 
1049 (auth_request_lookup_credentials): assertion failed: 
(request->credentials_scheme == scheme)
Jul  9 00:00:14 LXmail01 dovecot: auth: Error: Raw backtrace: 
/usr/lib64/dovecot/libdovecot.so.0(+0x8d57e) [0x7f197bd8157e] -> 
/usr/lib64/dovecot/libdovecot.so.0(+0x8d65e) [0x7f197bd8165e] ->
  /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f197bd201f6] -> 
dovecot/auth [1 wait, 0 passdb, 0 userdb](+0x1a15a) [0x7f197c44715a] -> 
dovecot/auth [1 wait, 0 passdb, 0 userdb](+0x26f8f)
[0x7f197c453f8f] -> dovecot/auth [1 wait, 0 passdb, 0 userdb](+0x19d2b) 
[0x7f197c446d2b] -> dovecot/auth [1 wait, 0 passdb, 0 
userdb](auth_request_lookup_credentials_callback+0x68) [0x7f197c4
46e28] -> dovecot/auth [1 wait, 0 passdb, 0 
userdb](passdb_handle_credentials+0x92) [0x7f197c457742] -> dovecot/auth 
[1 wait, 0 passdb, 0 userdb](+0x2af06) [0x7f197c457f06] -> dovecot/auth [1
  wait, 0 passdb, 0 userdb](+0x2065a) [0x7f197c44d65a] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x4c) 
[0x7f197bd94edc] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_in
ternal+0xff) [0x7f197bd9633f] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x25) 
[0x7f197bd94f65] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) 
[0x7f197bd95118] -> /usr
/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f197bd26663] 
-> dovecot/auth [1 wait, 0 passdb, 0 userdb](main+0x3a1) 
[0x7f197c43cbe1] -> /lib64/libc.so.6(__libc_start_main+0xf5)
[0x7f197b30ab15] -> dovecot/auth [1 wait, 0 passdb, 0 userdb](+0xfdd1) 
[0x7f197c43cdd1]
Jul  9 00:00:14 LXmail01 dovecot: auth: Fatal: master: service(auth): 
child 6555 killed with signal 6 (core dumps disabled)
Jul  9 00:00:14 LXmail01 dovecot: pop3-login: Warning: Auth connection 
closed with 1 pending requests (max 1 secs, pid=8133, EOF)

Environment is MySQL passdb/userdb, we are using plain scheme as default 
and password_noscheme field. In 2.2.24 and below auth worked without 
scratch. Reverting all policy-related commits in 2.2.25 fixes this, but 
I have not dug the details.

KR,

Alex