Folks:

I've been running Dovecot 2.0.7 on a Qmail / Vpopmail installation built on Debian Squeeze, with no problems for about a year. Dovecot is used for IMAP/S auth only.

Dovecot is built from source. I just upgraded to 2.0.15 but it segfaults whenever an IMAP auth is attempted, regardless of the user who tries to login, whether by webmail (Roundmail) Android phone (K-9 Mail) or iPad (Roundmail)

I downgraded to 2.0.13 but the segfault persisted. Re-installed 2.0.7 and that cleared it right up.

Here's the pertinent details from 2.0.15.

Anything else I can provide?

root@XXX:/# uname -a Linux XXX 2.6.32-5-686 #1 SMP Wed Jan 12 04:01:41 UTC 2011 i686 GNU/Linux

root@XXX:/# dovecot -n # 2.0.15: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 2.6.32-5-686 i686 Debian 6.0.3 auth_debug = yes auth_debug_passwords = yes auth_verbose = yes auth_verbose_passwords = plain disable_plaintext_auth = no first_valid_uid = XXXX last_valid_uid = XXXX log_path = /var/log/dovecot.log mail_debug = yes passdb { driver = vpopmail } protocols = imap service imap-login { inet_listener imap { address = * port = 143 } inet_listener imaps { address = * port = 993 } process_limit = 128 vsz_limit = 64 M } ssl_cert =

Here's a failed login transaction from /var/log/dovecot

[snip -- 10 lines or so. The SSL handshake completes OK] Nov 15 14:08:43 auth: Debug: client in: AUTH 1 PLAIN
service=imap secured lip=192.xxx.xxx.xxx
rip=174.79.xxx.xxxlport=143 rport=55437
resp=XYXYXYXYXYXXYXYXYXYXYXYXYXYX== Nov 15 14:08:43 auth-worker: Debug: Loading modules from directory: /usr/local/lib/dovecot/auth Nov 15 14:08:43 auth-worker: Debug: vpopmail(user@mydomain.net,174.79.xxx.xxx): lookup user=user domain=domain.net Nov 15 14:08:43 auth: Debug: client out: OK 1 user=user@mydomain.net Nov 15 14:08:43 auth: Debug: master in: REQUEST 2710831105 686
1 XYXYXYXYXYXXYYXYXYX Nov 15 14:08:43 auth-worker: Debug: vpopmail(user@domain.net,174.79.xxx.xxx): lookup user=user domain=domain.net Nov 15 14:08:43 auth: Error: auth worker: Aborted request: Worker process died unexpectedly Nov 15 14:08:43 master: Error: service(auth-worker): child 690 killed with signal 11 (core dumped) Nov 15 14:08:43 auth: Debug: master out: FAIL 2710831105 Nov 15 14:08:43 imap: Error: Internal auth failure (client-pid=686 client-id=1) Nov 15 14:08:43 imap-login: Info: Internal login failure (pid=686 id=1) (auth failed, 1 attempts): user=user@domain.net, method=PLAIN, rip=174.79.xxx.xxx, lip=192.xxx.xxx.xxx, mpid=691, TLS Nov 15 14:08:43 imap-login: Warning: SSL alert: where=0x4008, ret=256: warning close notify [174.79.xxx.xxx] Nov 15 14:08:43 auth-worker: Debug: Loading modules from directory: /usr/local/lib/dovecot/auth

I ought to mention that /usr/local/lib/dovecot/auth is empty.

Here's the backtrace:

root@XXX:/# gdb /usr/local/libexec/dovecot/auth /usr/local/var/run/dovecot/core GNU gdb (GDB) 7.0.1-debian [snip] Reading symbols from /usr/local/libexec/dovecot/auth...done.

warning: Can't read pathname for load map: Input/output error. Reading symbols from /usr/local/lib/dovecot/libdovecot.so.0...done. Loaded symbols for /usr/local/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 /home/vpopmail/lib/libvpopmail.so...(no debugging symbols found)...done. Loaded symbols for /home/vpopmail/lib/libvpopmail.so 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/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/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/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 /home/vpopmail/etc/vpopmail.authmodule...(no debugging symbols found)...done. Loaded symbols for /home/vpopmail/etc/vpopmail.authmodule Core was generated by `dovecot/auth -w'. Program terminated with signal 11, Segmentation fault. #0 0x00000000 in ?? ()

(gdb) bt full #0 0x00000000 in ?? () No symbol table info available. #1 0x08059890 in auth_worker_handle_user (client=0x82b34d0) at auth-worker-client.c:405 auth_request = 0x82b56e8 userdb_id = 1 #2 auth_worker_handle_line (client=0x82b34d0) at auth-worker-client.c:534 id = 2 #3 auth_worker_input (client=0x82b34d0) at auth-worker-client.c:614 _data_stack_cur_id = 3 line = <value optimized out> ret = 232 #4 0xb785f021 in io_loop_call_io (io=0x82b3688) at ioloop.c:384 ioloop = 0x82a6398 t_id = 2 #5 0xb78600d3 in io_loop_handler_run (ioloop=0x82a6398) at ioloop-epoll.c:213 ctx = 0x82b1f38 event = 0x82b1f78 list = 0x82b36b0 io = 0x829e2b0 tv = {tv_sec = 2147483, tv_usec = 0} msecs = 1 ret = 1 i = 0 j = 0 call = 192 #6 0xb785efa0 in io_loop_run (ioloop=0x82a6398) at ioloop.c:405 No locals. #7 0xb784abaa in master_service_run (service=0x82a62e8, callback=0x805c470 ) at master-service.c:481 No locals. #8 0x0805c828 in main (argc=2, argv=0x82a61c0) at main.c:298 c = <value optimized out> (gdb)

--mhg