postfix / local: неправильный запуск команды (segfaults)

После обновления почтового ящика Gentoo с postfix 2.5.5 до 2.6.6 локальная доставка почты больше не работает. Виртуальные почтовые ящики по-прежнему работают.

Вот журнал:

Jul 14 13:07:05 weser postfix/master[15825]: warning: process /usr/lib/postfix/local pid 20065 killed by signal 11
Jul 14 13:07:05 weser postfix/master[15825]: warning: /usr/lib/postfix/local: bad command startup -- throttling
Jul 14 13:07:05 weser postfix/qmgr[15829]: warning: private/local socket: malformed response
Jul 14 13:07:05 weser postfix/qmgr[15829]: warning: transport local failure -- see a previous warning/fatal/panic logfile record for the problem description
Jul 14 13:07:05 weser postfix/error[20067]: 5D2A3466D56C: to=<oliver@weser.XXX.YY>, orig_to=<oliver@ZZZ.ZZ>, relay=none, delay=6.9, delays=6.7/0.05/0/0.08, dsn=4.3.0, status=deferred (unknown mail transport error)

куда weser.XXX.YY это локальная машина. Я попробовал -v включить local и qmgr но это мне не очень помогло.

Я совершенно не понимаю, как дальше отлаживать. Пытаюсь отследить процессы с debugger_command не генерировал никаких ожидаемых выходных файлов.

Вопросы:

1. Как мне отладить это дальше?
2. Есть ли какие-нибудь предостережения, о которых я должен был знать перед обновлением с 2.5 до 2.6?

Обновить: Мне удалось получить журнал strace, и похоже, что segfault немедленно возникает после чтения файла спула из активной очереди.

Обновление 2: Мне удалось получить дамп ядра и создать трассировку:

#0  0x138f9469 in vstring_strcpy (vp=0x13929630, src=0x0) at vstring.c:409
#1  0x138e66d9 in dict_db_lookup (dict=0x139295b0, name=0x0) at dict_db.c:200
#2  0x138bd83e in deliver_alias (state=
      {level = 1, msg_attr = {level = 0, fp = 0x1392f630, queue_name = 0x1392f520 "active", queue_id = 0x1392f248 "0658546584CA", offset = 218, encoding = 0x1390b018 "", sender = 0x1390b018 "", dsn_envid = 0x1390b018 "", dsn_ret = 0, rcpt = {offset = 191, dsn_orcpt = 0x1390b018 "", dsn_notify = 0, orig_addr = 0x1392f5e0 "root@weser.XXX.YY", address = 0x1392f608 "root@weser.XXX.YY", u = {status = 0, queue = 0x0, addr_type = 0x0}}, domain = 0x0, local = 0x0, user = 0x0, extension = 0x0, unmatched = 0x0, owner = 0x0, delivered = 0x0, relay = 0x5d8f4a53 "local", msg_stats = {incoming_arrival = {tv_sec = 1279051621, tv_usec = 25651}, active_arrival = {tv_sec = 1279121939, tv_usec = 42594}, agent_handoff = {tv_sec = 1279121939, tv_usec = 124639}, conn_setup_done = {tv_sec = 0, tv_usec = 0}, deliver_done = {tv_sec = 0, tv_usec = 0}, reuse_count = 0}, exp_type = 0, exp_from = 0x0, request = 0x1392eb88, why = 0x1392f700}, dup_filter = 0x13931360, loop_info = 0x1392fa18, request = 0x1392eb88}, usr_attr={uid = 0, gid = 0, home = 0x0, logname = 0x0, shell = 0x0}, name=0x0, statusp=0x5d8f3d58)
    at alias.c:199
#3  0x138c3df9 in deliver_switch (state=
      {level = 1, msg_attr = {level = 0, fp = 0x1392f630, queue_name = 0x1392f520 "active", queue_id = 0x1392f248 "0658546584CA", offset = 218, encoding = 0x1390b018 "", sender = 0x1390b018 "", dsn_envid = 0x1390b018 "", dsn_ret = 0, rcpt = {offset = 191, dsn_orcpt = 0x1390b018 "", dsn_notify = 0, orig_addr = 0x1392f5e0 "root@weser.XXX.YY", address = 0x1392f608 "root@weser.XXX.YY", u = {status = 0, queue = 0x0, addr_type = 0x0}}, domain = 0x0, local = 0x0, user = 0x0, extension = 0x0, unmatched = 0x0, owner = 0x0, delivered = 0x0, relay = 0x5d8f4a53 "local", msg_stats = {incoming_arrival = {tv_sec = 1279051621, tv_usec = 25651}, active_arrival = {tv_sec = 1279121939, tv_usec = 42594}, agent_handoff = {tv_sec = 1279121939, tv_usec = 124639}, conn_setup_done = {tv_sec = 0, tv_usec = 0}, deliver_done = {tv_sec = 0, tv_usec = 0}, reuse_count = 0}, exp_type = 0, exp_from = 0x0, request = 0x1392eb88, why = 0x1392f700}, dup_filter = 0x13931360, loop_info = 0x1392fa18, request = 0x1392eb88}, usr_attr={uid = 0, gid = 0, home = 0x0, logname = 0x0, shell = 0x0}) at recipient.c:135
#4  0x138c4af8 in deliver_recipient (state=
      {level = 1, msg_attr = {level = 0, fp = 0x1392f630, queue_name = 0x1392f520 "active", queue_id = 0x1392f248 "0658546584CA", offset = 218, encoding = 0x1390b018 "", sender = 0x1390b018 "", dsn_envid = 0x1390b018 "", dsn_ret = 0, rcpt = {offset = 191, dsn_orcpt = 0x1390b018 "", dsn_notify = 0, orig_addr = 0x1392f5e0 "root@weser.XXX.YY", address = 0x1392f608 "root@weser.XXX.YY", u = {status = 0, queue = 0x0, addr_type = 0x0}}, domain = 0x1393145d "weser.XXX.YY", local = 0x13931458 "root", user = 0x13931480 "root", extension = 0x0, unmatched = 0x0, owner = 0x0, delivered = 0x1392f608 "root@weser.XXX.YY", relay = 0x5d8f4a53 "local", msg_stats = {incoming_arrival = {tv_sec = 1279051621, tv_usec = 25651}, active_arrival = {tv_sec = 1279121939, tv_usec = 42594}, agent_handoff = {tv_sec = 1279121939, tv_usec = 124639}, conn_setup_done = {tv_sec = 0, tv_usec = 0}, deliver_done = {tv_sec = 0, tv_usec = 0}, reuse_count = 0}, exp_type = 0, exp_from = 0x0, request = 0x1392eb88, why = 0x1392f700}, dup_filter = 0x13931360, loop_info = 0x1392fa18, request = 0x1392eb88}, usr_attr=
      {uid = 0, gid = 0, home = 0x0, logname = 0x0, shell = 0x0}) at recipient.c:319
#5  0x138c2246 in local_deliver (rqst=0x1392eb88, service=0x5d8f4a53 "local") at local.c:718
#6  0x138c23c5 in local_service (stream=0x1392daa8, service=0x5d8f4a53 "local", argv=0x5d8f4990) at local.c:756
#7  0x138c7c53 in single_server_wakeup (fd=14) at single_server.c:262
#8  0x138c7e1d in single_server_accept_local (unused_event=1, context=0x6 <Address 0x6 out of bounds>) at single_server.c:304
#9  0x138ed896 in event_loop (delay=-1) at events.c:1086
#10 0x138c8bd6 in single_server_main (argc=3, argv=0x5d8f4984, service=0x138c2351 <local_service>) at single_server.c:732
#11 0x138c2892 in main (argc=3, argv=0x5d8f4984) at local.c:917