thr3ads.net - dovecot - doveadm-server hangs with 100% cpu usage [Apr 2015]

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Dennis Kuhn

2015-Apr-20 16:10 UTC

doveadm-server hangs with 100% cpu usage

we have some replication issues. From time to time a doveadm-server
process takes 100% cpu in the state recv_mailbox_tree_deletes on the
replica. The process runs forever until it is manually killed. Strace on
this process doesn't show anything.
Sometimes we have several doveadm-server processes in this state, all
for the same account, all with 100% CPU Load.


The logfile on the master says:
 Error: Timeout during state=recv_mailbox_tree
 Error: dsync(dobby5.heinlein-support.de): I/O has stalled, no activity
for 600 seconds


My workaround is to delete the user directory on the replica  so that
the whole account is replicated again. This solves the problem for this
specific account.

The dovecot version is 2.2.15 on the master and 2.2.16 on the replica.



Dennis Kuhn
-- 
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin

http://www.heinlein-support.de

Tel: 030 / 405051-57
Fax: 030 / 405051-19

Zwangsangaben lt. ?35a GmbHG:
HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
Gesch?ftsf?hrer: Peer Heinlein -- Sitz: Berlin

Dennis Kuhn

2015-Apr-20 16:19 UTC

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doveadm-server hangs with 100% cpu usage

On 20.04.2015 18:10, Dennis Kuhn wrote:> 
> The dovecot version is 2.2.15 on the master and 2.2.16 on the replica.
> 
we had the same problems when both servers were on version 2.2.15.

Timo Sirainen

2015-Apr-21 19:50 UTC

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doveadm-server hangs with 100% cpu usage

On 20 Apr 2015, at 19:10, Dennis Kuhn <d.kuhn at heinlein-support.de>
wrote:> 
> we have some replication issues. From time to time a doveadm-server
> process takes 100% cpu in the state recv_mailbox_tree_deletes on the
> replica. The process runs forever until it is manually killed. Strace on
> this process doesn't show anything.
> Sometimes we have several doveadm-server processes in this state, all
> for the same account, all with 100% CPU Load.
Some bug, but there would need to be a way to reproduce it or otherwise it's
pretty much impossible to find what the bug is and get it fixed.
> My workaround is to delete the user directory on the replica  so that
> the whole account is replicated again. This solves the problem for this
> specific account.
So killing the doveadm-server process will cause it to hang again for the same
user? That's good, since it means it can be reproduced by taking a copy of
the mailboxes and trying to run "doveadm sync" manually on them
locally, e.g.:

doveadm -D -o mail=mdbox:/tmp/mdbox1 sync mdbox:/tmp/mdbox2

Does that hang? If yes, we can get further with it. The -D parameter is also
helpful here - v2.2.16 logs much more useful debug logging with dsync that can
also help catch these kind of hangs. Even if you can't reproduce the hang
the above way, having mail_debug=yes for dsync and getting the debug logs from a
hanging session would be useful. (But it may also mean that a hang might start
flooding your logs with debug messages and eat up all the disk space.)

Dennis Kuhn

2015-Apr-23 15:32 UTC

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doveadm-server hangs with 100% cpu usage

On 21.04.2015 21:50, Timo Sirainen wrote:> On 20 Apr 2015, at 19:10, Dennis Kuhn <d.kuhn at heinlein-support.de>
wrote:
>> My workaround is to delete the user directory on the replica  so that
>> the whole account is replicated again. This solves the problem for this
>> specific account.
> 
> So killing the doveadm-server process will cause it to hang again for the
same user? That's good, since it means it can be reproduced by taking a copy
of the mailboxes and trying to run "doveadm sync" manually on them
locally, e.g.:
> 
> doveadm -D -o mail=mdbox:/tmp/mdbox1 sync mdbox:/tmp/mdbox2
> 
> Does that hang? If yes, we can get further with it. The -D parameter is
also helpful here - v2.2.16 logs much more useful debug logging with dsync that
can also help catch these kind of hangs. Even if you can't reproduce the
hang the above way, having mail_debug=yes for dsync and getting the debug logs
from a hanging session would be useful. (But it may also mean that a hang might
start flooding your logs with debug messages and eat up all the disk space.)
> 
i will produce a debug log when the problem occurs next time. For the
last few days everything is working fine.

Peer Heinlein

2015-Sep-02 11:12 UTC

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doveadm-server hangs with 100% cpu usage

Am 21.04.2015 um 21:50 schrieb Timo Sirainen:
> So killing the doveadm-server process will cause it to hang again for the
same user? That's good, since it means it can be reproduced by taking a copy
of the mailboxes and trying to run "doveadm sync" manually on them
locally, e.g.:
> 
> doveadm -D -o mail=mdbox:/tmp/mdbox1 sync mdbox:/tmp/mdbox2
> 
> Does that hang? 
It's not hanging -- doveadm terminates. But at the end the destination
folder is empty:

root at dobby5:/tmp# doveadm -D -o mail_debug=yes -o mail=mdbox:/tmp/test1
sync mdbox:/tmp/test2


Debug: Loading modules from directory: /usr/lib/dovecot/modules



Debug: Module loaded: /usr/lib/dovecot/modules/lib01_acl_plugin.so



Debug: Module loaded: /usr/lib/dovecot/modules/lib10_quota_plugin.so



Debug: Module loaded: /usr/lib/dovecot/modules/lib15_notify_plugin.so



Debug: Module loaded: /usr/lib/dovecot/modules/lib20_mail_log_plugin.so



Debug: Module loaded:
/usr/lib/dovecot/modules/lib20_replication_plugin.so



Debug: Module loaded: /usr/lib/dovecot/modules/lib20_zlib_plugin.so



Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm



Debug: Module loaded:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so



Debug: Skipping module doveadm_expire_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so:
undefined symbol: expire_set_deinit (this is usually intentional, so
just ignore this message)
Debug: Module loaded:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so



Debug: Module loaded:
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_sieve_plugin.so



Debug: Skipping module doveadm_fts_plugin, because dlopen() failed:
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined
symbol: fts_backend_rescan (this is usually intentional, so just ignore
this message)
doveadm(root): Debug: Effective uid=0, gid=0, home=/root



doveadm(root): Debug: Quota root: name=User quota backend=dict
args=:noenforcing:file:/root/dovecot-quota


doveadm(root): Debug: Quota rule: root=User quota mailbox=* bytes=0
messages=500000


doveadm(root): Debug: Quota grace: root=User quota bytes=0 (10%)



doveadm(root): Debug: dict quota: user=root,
uri=file:/root/dovecot-quota, noenforcing=1



doveadm(root): Debug: Namespace inbox: type=private, prefix=INBOX/,
sep=/, inbox=yes, hidden=no, list=yes, subscriptions=yes
location=mdbox:/tmp/test1

doveadm(root): Debug: fs: root=/tmp/test1, index=, indexpvt=, control=,
inbox=, alt

doveadm(root): Debug: acl: initializing backend with data: vfile



doveadm(root): Debug: acl: acl username = root



doveadm(root): Debug: acl: owner = 1
doveadm(root): Debug: acl vfile: Global ACLs disabled
doveadm(root): Debug: Namespace : type=shared, prefix=shared/%u/, sep=/,
inbox=no, hidden=no, list=children, subscriptions=yes
location=mdbox:%h/mdbox
doveadm(root): Debug: shared: root=/var/run/dovecot/, index=, indexpvt=,
control=, inbox=, altdoveadm(root): Debug: acl: initializing backend with data:
vfile
doveadm(root): Debug: acl: acl username = root
doveadm(root): Debug: acl: owner = 0
doveadm(root): Debug: acl vfile: Global ACLs disabled
doveadm(root): Debug: Namespace : type=private, prefix=, sep=, inbox=no,
hidden=yes, list=no, subscriptions=no location=fail::LAYOUT=none
doveadm(root): Debug: none: root=, index=, indexpvt=, control=, inbox=,
altdoveadm(root): Debug: acl vfile: file /tmp/test1/mailboxes/dovecot-acl
not found
doveadm(root): Debug: acl vfile: file
/tmp/test1/mailboxes/INBOX/dbox-Mails/dovecot-acl not found
doveadm(root): Debug: Namespace INBOX/: Using permissions from
/tmp/test1: mode=0700 gid=default
dsync(root): Debug: Effective uid=0, gid=0, home=/root
dsync(root): Debug: Quota root: name=User quota backend=dict
args=:noenforcing:file:/root/dovecot-quota
dsync(root): Debug: Quota rule: root=User quota mailbox=* bytes=0
messages=500000
dsync(root): Debug: Quota grace: root=User quota bytes=0 (10%)
dsync(root): Debug: dict quota: user=root, uri=file:/root/dovecot-quota,
noenforcing=1
dsync(root): Debug: Namespace inbox: type=private, prefix=INBOX/, sep=/,
inbox=yes, hidden=no, list=yes, subscriptions=yes location=mdbox:/tmp/test2
dsync(root): Debug: fs: root=/tmp/test2, index=, indexpvt=, control=,
inbox=, altdsync(root): Debug: Namespace INBOX/: /tmp/test2 doesn't exist
yet,
using default permissions
dsync(root): Debug: Namespace INBOX/: Using permissions from /tmp/test2:
mode=0700 gid=default
dsync(root): Debug: acl: initializing backend with data: vfile
dsync(root): Debug: acl: acl username = root
dsync(root): Debug: acl: owner = 1
dsync(root): Debug: acl vfile: Global ACLs disabled
dsync(root): Debug: Namespace : type=shared, prefix=shared/%u/, sep=/,
inbox=no, hidden=no, list=children, subscriptions=yes
location=mdbox:%h/mdbox
dsync(root): Debug: shared: root=/var/run/dovecot/, index=, indexpvt=,
control=, inbox=, altdsync(root): Debug: acl: initializing backend with data:
vfile
dsync(root): Debug: acl: acl username = root
dsync(root): Debug: acl: owner = 0
dsync(root): Debug: acl vfile: Global ACLs disabled
dsync(root): Debug: Namespace : type=private, prefix=, sep=, inbox=no,
hidden=yes, list=no, subscriptions=no location=fail::LAYOUT=none
dsync(root): Debug: none: root=, index=, indexpvt=, control=, inbox=,
altdsync(root): Debug: acl vfile: file /tmp/test2/mailboxes/dovecot-acl not
found
dsync(root): Debug: acl vfile: file
/tmp/test2/mailboxes/INBOX/dbox-Mails/dovecot-acl not found
dsync(root): Debug: acl vfile: file
/tmp/test2/mailboxes/INBOX/dbox-Mails/dovecot-acl not found
dsync(root): Debug: brain M: Local mailbox tree: INBOX
guid=00000000000000000000000000000000 uid_validity=0 uid_next=0 subs=no
last_change=0 last_subs=0
dsync(root): Debug: brain S: Local mailbox tree: INBOX
guid=00000000000000000000000000000000 uid_validity=0 uid_next=0 subs=no
last_change=0 last_subs=0
dsync(root): Debug: brain M: Remote mailbox tree: INBOX
guid=00000000000000000000000000000000 uid_validity=0 uid_next=0 subs=no
last_change=0 last_subs=0
dsync(root): Debug: brain S: Remote mailbox tree: INBOX
guid=00000000000000000000000000000000 uid_validity=0 uid_next=0 subs=no
last_change=0 last_subs=0
dsync(root): Debug: brain M: Mailbox INBOX:
local=00000000000000000000000000000000/0/0,
remote=00000000000000000000000000000000/0/0: Directory rename branch not
found
dsync(root): Debug: brain S: Mailbox INBOX:
local=00000000000000000000000000000000/0/0,
remote=00000000000000000000000000000000/0/0: Directory rename branch not
found

Peer



-- 
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin

http://www.heinlein-support.de

Tel: 030 / 405051-42
Fax: 030 / 405051-19

Zwangsangaben lt. ?35a GmbHG: HRB 93818 B / Amtsgericht
Berlin-Charlottenburg,
Gesch?ftsf?hrer: Peer Heinlein -- Sitz: Berlin

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