dovecot - Oct 2010 - 2.0.5: dovecot/auth crash upon reload (with backtrace)

I can reproduce this by simply issuing:

doveadm reload

GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/dovecot-2/libexec/dovecot/auth...done.
Reading symbols from /usr/dovecot-2/lib/dovecot/libdovecot.so.0...done.
Loaded symbols for /usr/dovecot-2/lib/dovecot/libdovecot.so.0
Reading symbols from /lib/i686/cmov/libcrypt.so.1...Reading symbols from
/usr/lib/debug/lib/i686/cmov/libcrypt-2.11.2.so...done.
(no debugging symbols found)...done.
Loaded symbols for /lib/i686/cmov/libcrypt.so.1
Reading symbols from /lib/libpam.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libpam.so.0
Reading symbols from /lib/i686/cmov/libdl.so.2...Reading symbols from
/usr/lib/debug/lib/i686/cmov/libdl-2.11.2.so...done.
(no debugging symbols found)...done.
Loaded symbols for /lib/i686/cmov/libdl.so.2
Reading symbols from /lib/i686/cmov/libc.so.6...Reading symbols from
/usr/lib/debug/lib/i686/cmov/libc-2.11.2.so...done.
(no debugging symbols found)...done.
Loaded symbols for /lib/i686/cmov/libc.so.6
Reading symbols from /lib/i686/cmov/librt.so.1...Reading symbols from
/usr/lib/debug/lib/i686/cmov/librt-2.11.2.so...done.
(no debugging symbols found)...done.
Loaded symbols for /lib/i686/cmov/librt.so.1
Reading symbols from /lib/ld-linux.so.2...Reading symbols from
/usr/lib/debug/lib/ld-2.11.2.so...done.
(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/i686/cmov/libpthread.so.0...Reading symbols from
/usr/lib/debug/lib/i686/cmov/libpthread-2.11.2.so...done.
(no debugging symbols found)...done.
Loaded symbols for /lib/i686/cmov/libpthread.so.0
Reading symbols from /lib/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcc_s.so.1
Core was generated by `dovecot/auth'.
Program terminated with signal 6, Aborted.
#0  0xb772e430 in __kernel_vsyscall ()
#0  0xb772e430 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7556751 in *__GI_raise (sig=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = <value optimized out>
        pid = -1217994764
        selftid = 22112
#2  0xb7559b82 in *__GI_abort () at abort.c:92
        act = {__sigaction_handler = {sa_handler = 0xbfdc3ed0, 
            sa_sigaction = 0xbfdc3ed0}, sa_mask = {__val = {3077757632, 
              3218882212, 3077800674, 3218882196, 3077323828, 3218882184, 
              3077880404, 0, 3075510304, 1, 0, 1, 3077757192, 3218882108, 
              3218882104, 3077532336, 3077526747, 3077739624, 3218882188, 
              166684304, 0, 3218882256, 3218882184, 3218882196, 3077532029, 
              3077757192, 0, 725, 3218882216, 3077348830, 3218882188, 10}}, 
          sa_flags = -1076084988, sa_restorer = 0xb772a70c <pid.3601>}
        sigs = {__val = {32, 0 <repeats 31 times>}}
#3  0xb76f7695 in default_fatal_finish (type=<value optimized out>, 
    status=<value optimized out>) at failures.c:178
        backtrace = 0x9ef6280
"/usr/dovecot-2/lib/dovecot/libdovecot.so.0(+0x37681) [0xb76f7681] ->
/usr/dovecot-2/lib/dovecot/libdovecot.so.0(+0x376ef) [0xb76f76ef] ->
/usr/dovecot-2/lib/dovecot/libdovecot.so.0(i_error+0) [0xb76d1"...
#4  0xb76f76ef in i_internal_fatal_handler (type=LOG_TYPE_PANIC, status=0, 
    fmt=0x806bca4 "file %s: line %d (%s): assertion failed: (%s)", 
    args=0xbfdc3f84 "\017\314\006\bc") at failures.c:607
No locals.
#5  0xb76d15de in i_panic (
    format=0x806bca4 "file %s: line %d (%s): assertion failed: (%s)")
    at failures.c:244
No locals.
#6  0x080578e0 in auth_request_handler_unref (_handler=0xbfdc3fdc)
    at auth-request-handler.c:99
        handler = 0xa0384f8
        __FUNCTION__ = "auth_request_handler_unref"
#7  0x08058129 in auth_request_handler_destroy (_handler=0x6)
    at auth-request-handler.c:117
        handler = 0x0
        __FUNCTION__ = "auth_request_handler_destroy"
#8  0x080516f0 in auth_client_connection_destroy_full (
    _conn=<value optimized out>, abort_requests=<value optimized
out>)
    at auth-client-connection.c:355
        conn = 0x9fe3bf8
        clients = 0x9f82ba8
#9  0x080517b1 in auth_client_connections_deinit ()
    at auth-client-connection.c:407
        i = 2
#10 0x0805c1bf in main_deinit (argc=1, argv=0x9efe1c0) at main.c:166
No locals.
#11 main (argc=1, argv=0x9efe1c0) at main.c:284
        c = <value optimized out>

-- 
Ralf Hildebrandt
  Gesch?ftsbereich IT | Abteilung Netzwerk
  Charit? - Universit?tsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de