On Feb 5, 2015, at 10:39 PM, Casey Stone <tcst...@caseystone.com> wrote:
> Hello:
>
> I've been looking forward to getting my mail server up to Dovecot 2.2+ to be
> able to use the sync mechanism. I run my own mail server just for myself,
> with a few different accounts, and want to keep a master and backup server in
> sync.
>
> I'm running the Ubuntu server 14.04.1 mail stack which features Dovecot 2.2.9
> (and Postfix). My setup is to use system users (userdb passwd / passdb pam)
> with ~/Maildir. I'll post full sanitized output of dovecot -n if it seems
> necessary. I have not enabled any plugins (do I need the replicator plugin
> active?) I have in my conf a doveadm_password defined.
>
> Anyway, after setting up an ssl listener on the main machine and after
> considerable struggles with SSL, I was able to run doveadm sync from the
> backup server successfully for a small mailbox (around 78 MB) with this
> command:
>
> doveadm sync -R tcps:mainserver.example.com:12345
>
> Since I run this command as the system user on the backup server (same system
> users as main server) it 'just works' for the correct single user with no
> further options required. My plan is to run a daily cron job to sync once
> daily for each user.
>
> The problem is when I try to sync a larger mailbox, say 1 GB, dsync-server on
> the remote (master) machine throws fatal error 83 Out of Memory. I already
> raised vsz_limit to 512 MB. Problems probably arise with mailboxes around 200
> MB though I haven't tested specifically. So my question is, is this expected
> and I will need to give my VM much more memory to be able to use dovecot
> sync, or do I have something set wrong, or is it a bug?
>
> Thanks for your help.
No repsonses :-(
Here is what it looks like when it crashes with an out of memory error:
(start of the run)
Feb 13 14:02:38 thepost dovecot: doveadm(10.0.1.22,tcstone): Debug: Effective
uid=1002, gid=1002, home=/home/tcstone
Feb 13 14:02:38 thepost dovecot: doveadm(10.0.1.22,tcstone): Debug: Namespace
inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list$
Feb 13 14:02:38 thepost dovecot: doveadm(10.0.1.22,tcstone): Debug: maildir++:
root=/data/tcstone/Maildir, index=, indexpvt=, control=, inbo$
Feb 13 14:02:39 thepost dovecot: dsync-server(tcstone): Debug: Namespace :
Using permissions from /data/tcstone/Maildir: mode=0700 gid=defau$
Feb 13 14:02:39 thepost dovecot: dsync-server(tcstone): Debug: brain S: out
state=send_mailbox_tree changed=1
<<<many, many more brain messages>>>
(end of the run)
Feb 13 14:02:52 thepost dovecot: dsync-server(tcstone): Fatal:
pool_system_realloc(536870912): Out of memory
Feb 13 14:02:52 thepost dovecot: dsync-server(tcstone): Error: Raw backtrace:
/usr/lib/dovecot/libdovecot.so.0(+0x5e271) [0x7f9d2056b271] ->
/usr/lib/dovecot/libdovecot.so.0(+0x5e34e) [0x7f9d2056b34e] ->
/usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7f9d20526bf8] ->
/usr/lib/dovecot/libdovecot.so.0(+0x72d53) [0x7f9d2057fd53] ->
/usr/lib/dovecot/libdovecot.so.0(+0x7792a) [0x7f9d2058492a] ->
/usr/lib/dovecot/libdovecot.so.0(+0x77be6) [0x7f9d20584be6] ->
/usr/lib/dovecot/libdovecot.so.0(+0x78748) [0x7f9d20585748] ->
/usr/lib/dovecot/libdovecot.so.0(o_stream_sendv+0x8d) [0x7f9d20583d7d] ->
/usr/lib/dovecot/libdovecot.so.0(o_stream_send+0x1a) [0x7f9d20583e1a] ->
/usr/lib/dovecot/modules/libssl_iostream_openssl.so(+0x4c05) [0x7f9d1f6a0c05]
->
/usr/lib/dovecot/modules/libssl_iostream_openssl.so(openssl_iostream_bio_sync+0x21)
[0x7f9d1f6a1881] ->
/usr/lib/dovecot/modules/libssl_iostream_openssl.so(+0x7a4d) [0x7f9d1f6a3a4d]
-> /usr/lib/dovecot/modules/libssl_iostream_openssl.so(+0x7d69)
[0x7f9d1f6a3d69] -> /usr/lib/dovecot/libdovecot.so.0(o_stream_sendv+0x8d)
[0x7f9d20583d7d] -> /usr/lib/dovecot/libdovecot.so.0(o_stream_nsendv+0xf)
[0x7f9d20583e5f] -> /usr/lib/dovecot/libdovecot.so.0(o_stream_nsend+0x1a)
[0x7f9d20583e8a] -> dovecot/doveadm-server(+0x2b03f) [0x7f9d20d3003f] ->
dovecot/doveadm-server(+0x2c768) [0x7f9d20d31768] ->
dovecot/doveadm-server(dsync_ibc_send_mail+0x29) [0x7f9d20d2f309] ->
dovecot/doveadm-server(dsync_brain_sync_mails+0x5fc) [0x7f9d20d24a1c] ->
dovecot/doveadm-server(dsync_brain_run+0x523) [0x7f9d20d20f93] ->
dovecot/doveadm-server(+0x1c270) [0x7f9d20d21270] ->
dovecot/doveadm-server(+0x2de60) [0x7f9d20d32e60] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x27) [0x7f9d2057b247] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0xd7) [0x7f9d2057bfd7] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f9d2057ade8] ->
dovecot/doveadm-server(+0x1a189) [0x7f9d20d1f189] ->
dovecot/doveadm-server(+0xebeb) [0x7f9d20d13beb]
Feb 13 14:02:52 thepost dovecot: dsync-server(tcstone): Fatal: master:
service(doveadm): child 13232 returned error 83 (Out of memory (service doveadm
{ vsz_limit=512 MB }, you may need to increase it) - set DEBUG_OUTOFMEM=1
environment to get core dump)
I haven't tested whether it is simply the effect of having DEBUG active that
kills it... A run requiring moving just over 100 MB of mail is enough to cause
the error. I have tested manually copying the Maildir to the backup server,
then running the sync or backup command -- this works. Thus is seems related
not to the size of the mailbox but the size of the data that needs to be copied.
