The Wed, 13 Jan 2016 01:33:42 +0100, "D[r]eadlock M"
<m.dreadlock at gmail.com> wrote
> Hello,
>
> I've being trying to play with shared mailboxes but experienced a
> segfault: [New LWP 9611]
> Core was generated by `dovecot/imap'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> (gdb) bt f
> #0 0x00007f5b72f429b2 in acl_mailbox_get_aclobj (box=<optimized
> #out>) at
> acl-mailbox.c:31
> abox = 0x0
> #1 0x00007f5b72d30fcc in cmd_myrights (cmd=0x7f5b75c97480) at
> imap-acl-plugin.c:331
> ns = <optimized out>
> box = 0x7f5b75ca4520
> mailbox = 0x7f5b75c752a8 "shared"
> orig_mailbox = 0x7f5b75c80be0 "shared"
> rights = 0x7f5b75c75108
> str = <optimized out>
> #2 0x00007f5b73f2e09c in command_exec
> #(cmd=cmd at entry=0x7f5b75c97480) at
> imap-commands.c:158
> hook = 0x7f5b75c7e0f0
> ret = <optimized out>
> #3 0x00007f5b73f2cfb2 in client_command_input (cmd=0x7f5b75c97480)
> #at
> imap-client.c:778
> client = 0x7f5b75c96880
> command = <optimized out>
> __FUNCTION__ = "client_command_input"
> #4 0x00007f5b73f2d066 in client_command_input (cmd=0x7f5b75c97480)
> #at
> imap-client.c:839
> client = 0x7f5b75c96880
> command = <optimized out>
> __FUNCTION__ = "client_command_input"
> #5 0x00007f5b73f2d39d in client_handle_next_command
> (remove_io_r=<synthetic pointer>, client=0x7f5b75c96880) at
> imap-client.c:877
> No locals.
> #6 client_handle_input (client=0x7f5b75c96880) at imap-client.c:889
> _data_stack_cur_id = 3
> remove_io = false
> handled_commands = true
> client = 0x7f5b75c96880
> #7 0x00007f5b73f2d745 in client_input (client=0x7f5b75c96880) at
> imap-client.c:931
> cmd = 0x9f3f2
> output = 0x7f5b75c972c0
> bytes = 95
> __FUNCTION__ = "client_input"
> #8 0x00007f5b73773d0f in io_loop_call_io (io=0x7f5b75c97390) at
> ioloop.c:441
> ioloop = 0x7f5b75c7d740
> t_id = 2
> __FUNCTION__ = "io_loop_call_io"
> #9 0x00007f5b73774d09 in io_loop_handler_run_internal
> (ioloop=ioloop at entry=0x7f5b75c7d740)
> at ioloop-epoll.c:220
> ctx = 0x7f5b75c7e3d0
> io = <optimized out>
> tv = {tv_sec = 1799, tv_usec = 999014}
> events_count = <optimized out>
> msecs = <optimized out>
> ret = 1
> i = 0
> j = <optimized out>
> call = <optimized out>
> __FUNCTION__ = "io_loop_handler_run_internal"
> #10 0x00007f5b73773d79 in io_loop_handler_run
> (ioloop=ioloop at entry=0x7f5b75c7d740)
> at ioloop.c:488
> No locals.
> #11 0x00007f5b73773df8 in io_loop_run (ioloop=0x7f5b75c7d740) at
> ioloop.c:465
> __FUNCTION__ = "io_loop_run"
> #12 0x00007f5b7371edc3 in master_service_run
> #(service=0x7f5b75c7d5d0,
> callback=<optimized out>) at master-service.c:566
> No locals.
> #13 0x00007f5b73f21254 in main (argc=1, argv=0x7f5b75c7d390) at
> #main.c:400
> set_roots = {0x7f5b74145980 <imap_setting_parser_info>, 0x0}
> login_set = {auth_socket_path = 0x7f5b75c75048 "\001",
> postlogin_socket_path = 0x0, postlogin_timeout_secs = 60, callback >
0x7f5b73f371f0 <login_client_connected>, failure_callback >
0x7f5b73f36ed0 <login_client_failed>,
> request_auth_token = 1}
> service_flags = <optimized out>
> storage_service_flags = <optimized out>
> username = 0x0
> c = <optimized out>
>
>
> It happens when my client (mutt) tries to enter the shared/ folder.
> A filtered strace shows (note the 7 seconds between write and read,
> presumely the command sent by mutt):
> 8704 00:40:51.420843
> open("/var/vmail/domain.tld/marc/Maildir/.Sent/dovecot-acl",
> O_RDONLY) = -1 ENOENT (No such file or directory)
> 8704 00:40:51.420978
> stat("/var/vmail/domain.tld/marc/Maildir/dovecot-acl",
> 0x7fffc618dcb0) = -1 ENOENT (No such file or directory)
> 8704 00:40:51.421100
open("/var/vmail/domain.tld/shared-mailboxes",
> O_RDONLY) = 4
> 8704 00:40:51.421800 openat(AT_FDCWD,
> "/var/vmail/domain.tld/marc/Maildir",
> O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 12
> 8704 00:40:51.422217 write(7, "* LIST (\\HasNoChildren \\Sent)
> \"/\" Sent\r\n* LIST (\\Noselect \\HasNoChildren) \"/\"
shared\r\n*
> LIST (\\HasNoChildren) \"/\" INBOX\r\na0005 OK List completed.\r
> \n", 147) = 147 8704 00:40:58.235762 <... read resumed>
"a0006
> MYRIGHTS \"shared\"\r\na0007 STATUS \"Drafts\"
(MESSAGES)\r\na0008
> SELECT \"shared\"\r\n", 8137) = 82
>
> I admit I've played a little with directories in /var/vmail/ and
> got a few 'permission denied' but I think I fixed them correctly
> (move /var/mail/domain.tld/marc into .../Maildir, who ended being
> root:root)
>
> To finish, my dovecot -n:
> # 2.2.13: /etc/dovecot/dovecot.conf
> # OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.2
> mail_location = maildir:~/Maildir
> mail_plugins = acl
> namespace {
> location = maildir:%%h/Maildir:INDEXPVT=~/Maildir/shared/%%n
> prefix = shared/%%n/
> separator = /
> type = shared
> }
> namespace inbox {
> inbox = yes
> location > mailbox Drafts {
> special_use = \Drafts
> }
> mailbox Junk {
> special_use = \Junk
> }
> mailbox Sent { special_use = \Sent
> }
> mailbox "Sent Messages" {
> special_use = \Sent
> }
> mailbox Trash {
> special_use = \Trash
> }
> prefix > separator = /
> type = private
> }
> passdb {
> args = scheme=SHA512-CRYPT username_format=%u /etc/dovecot/users
> driver = passwd-file
> }
> plugin {
> acl = vfile
> acl_shared_dict = file:/var/vmail/%d/shared-mailboxes
> }
> protocols = " imap lmtp"
> service auth-worker {
> user = $default_internal_user
> }
> service auth {
> unix_listener /var/spool/postfix/private/auth {
> mode = 0666
> }
> }
> service lmtp {
> unix_listener /var/spool/postfix/private/dovecot-lmtp {
> group = postfix
> mode = 0666
> user = postfix
> }
> }
> ssl = required
> ssl_cert = </etc/letsencrypt/live/domain.tld/fullchain.pem
> ssl_key = </etc/letsencrypt/live/domain.tld/privkey.pem
> userdb {
> args = uid=vmail gid=vmail home=/var/vmail/%d/%n
> driver = static
> }
> userdb {
> args = uid=vmail gid=vmail home=/var/vmail/%d/shared/%n
> driver = static
> }
> protocol imap {
> mail_plugins = acl imap_acl
> }
>
> Thanks,
>
> Marc
Hum, should be fixed by
https://github.com/dovecot/core/commit/f136b0050b3125b466af73984177250b7ed1a3be
But I do not fully understand the commit message, especially the "it
probably should have been a type=public namespace instead". Could I
change my conf to no longer experience the segfault ?
Thanks,
Marc.