The Wed, 13 Jan 2016 01:33:42 +0100, "D[r]eadlock M" m.dreadlock@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=) 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@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@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@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 , 0x0} login_set = {auth_socket_path = 0x7f5b75c75048 "\001", postlogin_socket_path = 0x0, postlogin_timeout_secs = 60, callback = 0x7f5b73f371f0 , failure_callback = 0x7f5b73f36ed0 , 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 =

Thanks,

Marc

Hum, should be fixed by https://github.com/dovecot/core/commit/f136b0050b3125b466af73984177250b7ed1a...

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.