Hello.
I seem to have found a race condition, when setting flags on multiple emails
rapidly. 5 commands including login to reproduce. Problem found using mutt in
real world usage.
Seems to happen both with UID STORE 1:3 and UID STORE 1,2,3 ..
I have tried with the following packages, with a minimized config in a
throwaway vm:
https://packages.debian.org/stretch/dovecot-core
Package: dovecot-core (1:2.2.27-3+deb9u2)
https://packages.debian.org/stretch-backports/dovecot-core
Package: dovecot-core (1:2.2.34-2~bpo9+1)
Also tested pristine:
https://dovecot.org/releases/2.3/dovecot-2.3.0.1.tar.gz
https://dovecot.org/releases/2.2/dovecot-2.2.34.tar.gz
https://dovecot.org/releases/2.2/dovecot-2.2.35.tar.gz
.. built on Debian9 with:
# apt-get build-dep dovecot-core
# bash configure --prefix=/scratch/dovecot-test
Tried with both mailbox over NFS (backed by ext4), and also mailbox on ext4.
On my test systems, I am only able to reproduce it with mbox_lazy_writes=no,
but with production settings on a Ubuntu 14.04 with 1:2.2.9-1ubuntu2.4 that has
mbox_lazy_writes=yes it is still reproducable with mutt.
I have found two different ways to reproduce it with netcat + cut'n'paste,
below is done with 2.2.34/35.
All servers are VMs in Ganeti/kvm clusters (Debian hosts in one
cluster&organization, Ubuntu host in another cluster&organization).
Debian minimized config:
> doveconf -n
# 2.2.34 (874deae): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.22 (22940fb7)
# OS: Linux 4.9.0-6-amd64 x86_64 Debian 9.4
# Hostname: mail2-vm.cs.umu.se
auth_mechanisms = plain login
auth_verbose = yes
debug_log_path = syslog
info_log_path = syslog
mail_location = mbox:~/Mail:INBOX=/var/mail/%u
mail_privileged_group = mail
mbox_lazy_writes = no
namespace inbox {
inbox = yes
location =
prefix =
}
passdb {
driver = pam
}
protocols = imap
service auth {
client_limit = 2500
unix_listener auth-client {
group = postfix
mode = 0660
}
}
service imap-login {
inet_listener imap {
port = 143
}
}
service imap {
executable = imap
}
ssl = no
syslog_facility = local1
userdb {
driver = passwd
}
Attached is a mailbox that can be used to reproduce the problem, called
"error-box", anonymized with mbox-anonymize.pl. It was created by sending test
messages with mutt 1.7.2 through Dovecot/Postfix/Amavis.
**** Method 1, with IDLE:
Setup a local account, MY-USER / MY-PASSWORD (replace below).
> mkdir Mail
> cp error-box Mail/error1
> nc -v localhost 143
Paste the following 3 lines in a go:
a0000 LOGIN "MY-USER" "MY-PASSWORD"
a0010 SELECT "error1"
a0020 IDLE
then wait a second.. then paste the following 3 in a go:
DONE
a0030 UID STORE 1:3 +FLAGS (\Deleted)
a0040 EXPUNGE
Notice that the results from UID STORE + EXPUNGE gives:
* 2 FETCH (UID 2 FLAGS (\Recent))
* 3 FETCH (UID 3 FLAGS (\Recent))
* 1 EXPUNGE
* 3 RECENT
a0030 OK Store completed (0.004 + 0.000 + 0.003 secs).
a0040 OK Expunge completed (0.004 + 0.000 + 0.003 secs).
Verify what's left in the mailbox with:
a0050 UID FETCH 1:4 FLAGS
* 1 FETCH (UID 2 FLAGS (\Recent))
* 2 FETCH (UID 3 FLAGS (\Recent))
* 3 FETCH (UID 4 FLAGS (\Recent))
a0050 OK Fetch completed (0.001 + 0.000 secs).
Since 1 to 3 should be \Deleted and then EXPUNGEd, we should only have UID 4
left, not uid 2-4 without Deleted flag.
Try same again, but with 1 inserted delay (use a new mailbox name for every
test, otherwise UID numbering will vary, indexes etc):
> cp error-box Mail/error2
> nc -v localhost 143
Paste the following 3 lines in a go:
a0000 LOGIN "MY-USER" "MY-PASSWORD"
a0010 SELECT "error2"
a0020 IDLE
then wait a second.. then paste 1 line:
DONE
then [newly introduced] wait a second.. then paste 2 lines:
a0030 UID STORE 1:3 +FLAGS (\Deleted)
a0040 EXPUNGE
Notice that the results from UID STORE + EXPUNGE gives:
* 1 FETCH (UID 1 FLAGS (\Deleted \Recent))
* 2 FETCH (UID 2 FLAGS (\Deleted \Recent))
* 3 FETCH (UID 3 FLAGS (\Deleted \Recent))
a0030 OK Store completed (0.003 + 0.000 + 0.002 secs).
* 3 EXPUNGE
* 2 EXPUNGE
* 1 EXPUNGE
* 1 RECENT
a0040 OK Expunge completed (0.003 + 0.000 + 0.002 secs).
Verify what's left in the mailbox with:
a0050 UID FETCH 1:4 FLAGS
* 1 FETCH (UID 4 FLAGS (\Recent))
a0050 OK Fetch completed (0.001 + 0.000 secs).
So if I wait some between DONE and UID STORE, it seems to be ok.
If I, in the problem-triggering method, change
a0030 UID STORE 1:3 +FLAGS (\Deleted)
a0040 EXPUNGE
to
a0030 UID STORE 1:3 +FLAGS (\Deleted)
a0035 UID FETCH 1:4 FLAGS
a0040 EXPUNGE
The untagged responses become:
* 1 FETCH (UID 1 FLAGS (\Deleted \Recent))
* 2 FETCH (UID 2 FLAGS (\Deleted \Recent))
* 3 FETCH (UID 3 FLAGS (\Deleted \Recent))
* 4 FETCH (UID 4 FLAGS (\Recent))
* 2 FETCH (UID 2 FLAGS (\Recent))
* 3 FETCH (UID 3 FLAGS (\Recent))
* 1 EXPUNGE
* 3 RECENT
Full transcript (in&out from screen) from first, failing, run:
localhost [127.0.0.1] 143 (imap2) open
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
AUTH=PLAIN AUTH=LOGIN] Dovecot (Debian) ready.
a0000 LOGIN "MY-USERNAME" "MY-PASSWORD"
a0010 SELECT "error1"
a0020 IDLE
a0000 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT
MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS
LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN
CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY] Logged in
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags
permitted.
* 4 EXISTS
* 4 RECENT
* OK [UNSEEN 1] First unseen.
* OK [UIDVALIDITY 1520944853] UIDs valid
* OK [UIDNEXT 5] Predicted next UID
a0010 OK [READ-WRITE] Select completed (0.003 + 0.000 + 0.004 secs).
+ idling
DONE
a0030 UID STORE 1:3 +FLAGS (\Deleted)
a0040 EXPUNGE
a0020 OK Idle completed (7.805 + 7.804 + 7.804 secs).
* 2 FETCH (UID 2 FLAGS (\Recent))
* 3 FETCH (UID 3 FLAGS (\Recent))
* 1 EXPUNGE
* 3 RECENT
a0030 OK Store completed (0.004 + 0.000 + 0.003 secs).
a0040 OK Expunge completed (0.004 + 0.000 + 0.003 secs).
a0050 UID FETCH 1:4 FLAGS
* 1 FETCH (UID 2 FLAGS (\Recent))
* 2 FETCH (UID 3 FLAGS (\Recent))
* 3 FETCH (UID 4 FLAGS (\Recent))
a0050 OK Fetch completed (0.001 + 0.000 secs).
Full transcript (in&out from screen) from the second, slower, run:
localhost [127.0.0.1] 143 (imap2) open
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
AUTH=PLAIN AUTH=LOGIN] Dovecot (Debian) ready.
a0000 LOGIN "MY-USERNAME" "MY-PASSWORD"
a0010 SELECT "error2"
a0020 IDLE
a0000 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT
MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS
LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN
CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY] Logged in
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags
permitted.
* 4 EXISTS
* 4 RECENT
* OK [UNSEEN 1] First unseen.
* OK [UIDVALIDITY 1520944957] UIDs valid
* OK [UIDNEXT 5] Predicted next UID
a0010 OK [READ-WRITE] Select completed (0.003 + 0.000 + 0.004 secs).
+ idling
DONE
a0020 OK Idle completed (2.830 + 2.829 + 2.829 secs).
a0030 UID STORE 1:3 +FLAGS (\Deleted)
a0040 EXPUNGE
* 1 FETCH (UID 1 FLAGS (\Deleted \Recent))
* 2 FETCH (UID 2 FLAGS (\Deleted \Recent))
* 3 FETCH (UID 3 FLAGS (\Deleted \Recent))
a0030 OK Store completed (0.003 + 0.000 + 0.002 secs).
* 3 EXPUNGE
* 2 EXPUNGE
* 1 EXPUNGE
* 1 RECENT
a0040 OK Expunge completed (0.003 + 0.000 + 0.002 secs).
a0050 UID FETCH 1:4 FLAGS
* 1 FETCH (UID 4 FLAGS (\Recent))
a0050 OK Fetch completed (0.001 + 0.000 secs).
Transcript from .muttdebug0 when using mutt 1.7.2 against the production server
with NFS backed storage, marking message 1-3 for deletion and hitting $ for
sync. This is how the problem was first found.
[2018-03-12 13:46:28] 5> a0020 IDLE^M
[2018-03-12 13:46:28] 5< + idling
...
[2018-03-12 13:46:29] Marking 3 messages deleted...
[2018-03-12 13:46:29] Expunging messages from server...
[2018-03-12 13:46:29] 5> DONE^M
a0021 UID STORE 1:3 +FLAGS.SILENT (\Deleted)^M
a0022 EXPUNGE^M
[2018-03-12 13:46:29] 5< a0020 OK Idle completed (0.001 + 1.634 + 1.633 secs).
[2018-03-12 13:46:29] 5< * 2 FETCH (FLAGS (\Recent))
[2018-03-12 13:46:29] Handling FETCH
[2018-03-12 13:46:29] FETCH response ignored for this message
[2018-03-12 13:46:29] 5< * 3 FETCH (FLAGS (\Recent))
[2018-03-12 13:46:29] Handling FETCH
[2018-03-12 13:46:29] FETCH response ignored for this message
[2018-03-12 13:46:29] 5< * 1 EXPUNGE
[2018-03-12 13:46:29] Handling EXPUNGE
[2018-03-12 13:46:29] 5< * 3 RECENT
[2018-03-12 13:46:29] 5< a0021 OK Store completed (0.001 + 0.000 + 0.001 secs).
[2018-03-12 13:46:29] 5< a0022 OK Expunge completed (0.001 + 0.000 secs).
[2018-03-12 13:46:29] IMAP queue drained
[2018-03-12 13:46:29] imap_cmd_finish: Expunging mailbox
*** Method 2, without IDLE (seems to require that I fetch flags before the
wait/store)
Copy'n'paste the following:
a0000 LOGIN "MY-USER" "MY-PASSWORD"
a0010 SELECT "error20"
a0015 FETCH 1:4 (UID FLAGS)
<wait a second, then paste the next two in one go>
a0020 UID STORE 1:3 +FLAGS (\Deleted)
a0025 EXPUNGE
Gives the following transcript:
mail3-vm:~/Mail> nc -v localhost 143
localhost [127.0.0.1] 143 (imap2) open
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
a0000 LOGIN "MY-USER" "MY-PASSWORD"
a0010 SELECT "error20"
a0015 FETCH 1:4 (UID FLAGS)
a0000 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT
MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS
LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN
CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY] Logged in
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags
permitted.
* 4 EXISTS
* 4 RECENT
* OK [UNSEEN 1] First unseen.
* OK [UIDVALIDITY 1521552107] UIDs valid
* OK [UIDNEXT 5] Predicted next UID
a0010 OK [READ-WRITE] Select completed (0.001 + 0.000 + 0.001 secs).
* 1 FETCH (UID 1 FLAGS (\Recent))
* 2 FETCH (UID 2 FLAGS (\Recent))
* 3 FETCH (UID 3 FLAGS (\Recent))
* 4 FETCH (UID 4 FLAGS (\Recent))
a0015 OK Fetch completed (0.001 + 0.000 secs).
a0020 UID STORE 1:3 +FLAGS (\Deleted)
a0025 EXPUNGE
* 2 FETCH (UID 2 FLAGS (\Recent))
* 3 FETCH (UID 3 FLAGS (\Recent))
* 1 EXPUNGE
* 3 RECENT
a0020 OK Store completed (0.001 + 0.000 secs).
a0025 OK Expunge completed (0.001 + 0.000 secs).
/Tomas
--
Tomas Forsman, st...@cs.umu.se, http://people.cs.umu.se/stric/
`- SysAdmin at Computing Science, University of Umeå
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