[Dovecot] Dovecot Director Doveadm fails when there are a lot of output information

[Ramon Frontera]

Hi,
we are running dovecot 2.1.13
We have 2 proxies with director and 4 mail servers. we use LDAP

when we execute doveadm-quota -A and doveadm with few output lines, its works fine. 
When we use doveadm-search or doveadm-mailbox with a lot of output information the command stops the execution and the command no ends.
The connection to one of the 4 mailserver has finished at this moment.

I have made some tests and i have found that if we use only one mailserver the commands works fine.

I put the gdm bt output hope it help you. (the proxy thats executes the command)

(gdb) bt full
#0  0x0000003872ee86f3 in __epoll_wait_nocancel () from /lib64/libc.so.6
No symbol table info available.
#1  0x0000003873a534b8 in io_loop_handler_run (ioloop=0x2364120)
   at ioloop-epoll.c:181
       ctx = 0x236b080
       events = <value optimized out>
       event = <value optimized out>
       list = <value optimized out>
       io = <value optimized out>
       tv = {tv_sec = 59, tv_usec = 389208}
       msecs = 59390
       ret = <value optimized out>
       i = <value optimized out>
       call = <value optimized out>
#2  0x0000003873a52488 in io_loop_run (ioloop=0x2364120) at ioloop.c:398
No locals.
#3  0x0000003873a3de43 in master_service_run (service=0x2363fd0,
   callback=<value optimized out>) at master-service.c:544
No locals.
#4  0x0000000000413d6e in doveadm_server_flush_one ()
No symbol table info available.
#5  0x0000000000414741 in doveadm_mail_server_user ()
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#6  0x000000000040e6bc in doveadm_mail_next_user ()
No symbol table info available.
#7  0x000000000040ed7c in doveadm_mail_cmd ()
No symbol table info available.
#8  0x000000000040f00c in doveadm_mail_try_run ()
No symbol table info available.
#9  0x00000000004162b1 in main ()
No symbol table info available.

Thanks in advance!
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  Ramon Frontera
  Universitat de les Illes Balears