Tomas Forsman
2018-Mar-20 14:56 UTC
Race condition when setting flags (\Deleted) + expunge quickly, leaving mails not deleted
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 143Paste 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 143Paste 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, stric at cs.umu.se, http://people.cs.umu.se/stric/ `- SysAdmin at Computing Science, University of Ume? -------------- next part -------------->From xxxxx at xx.xxx.xx Mon Mar 12 11:59:57 2018Return-Path: <xxxxx at xx.xxx.xx> X-Original-To: xxxxx at xx.xxx.xx Delivered-To: xxxxx at xx.xxx.xx Received: xxxx xxxxxxxxx (xxxxxxxxx [xxx.x.x.x]) xx xxxxxxx-xxx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) X-Virus-Scanned: xxxxxx xxxxxxx-xxx xx xx.xxx.xx Received: xxxx xxxx.xx.xxx.xx ([xxx.x.x.x]) xx xxxxxxxxx (xxxx-xx.xx.xxx.xx [xxx.x.x.x]) (xxxxxxx-xxx, xxxx xxxxx) xxxx xxxx xx xxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xxxx xxxxxxxxxxx.xx.xxx.xx (xxxxxxxxxxx.xx.xxx.xx [xxx.xxx.xx.xx]) xx xxxx.xx.xxx.xx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xx xxxxxxxxxxx.xx.xxx.xx (xxxxxxx, xxxx xxxxxx xxxxxx) xx xxxxxxx; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Date: Mon, 12 Mar 2018 11:59:56 +0100 From: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> To: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> Subject: xxxxx Message-ID: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> MIME-Version: x.x Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: xxxxxxx/xxxxxxxx (x.x.x) Content-Length: 134 Lines: x xxxxx /xxxxx -- xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx?>From xxxxx at xx.xxx.xx Mon Mar 12 12:00:10 2018Return-Path: <xxxxx at xx.xxx.xx> X-Original-To: xxxxx at xx.xxx.xx Delivered-To: xxxxx at xx.xxx.xx Received: xxxx xxxxxxxxx (xxxxxxxxx [xxx.x.x.x]) xx xxxxxxx-xxx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) X-Virus-Scanned: xxxxxx xxxxxxx-xxx xx xx.xxx.xx Received: xxxx xxxx.xx.xxx.xx ([xxx.x.x.x]) xx xxxxxxxxx (xxxx-xx.xx.xxx.xx [xxx.x.x.x]) (xxxxxxx-xxx, xxxx xxxxx) xxxx xxxx xx xxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xxxx xxxxxxxxxxx.xx.xxx.xx (xxxxxxxxxxx.xx.xxx.xx [xxx.xxx.xx.xx]) xx xxxx.xx.xxx.xx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xx xxxxxxxxxxx.xx.xxx.xx (xxxxxxx, xxxx xxxxxx xxxxxx) xx xxxxxxx; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Date: Mon, 12 Mar 2018 12:00:08 +0100 From: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> To: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> Subject: xx: xxxxx Message-ID: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> References: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> MIME-Version: x.x Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> User-Agent: xxxxxxx/xxxxxxxx (x.x.x) Content-Length: 324 Lines: xx xxxxxx xx xx xxxxx, xxxx - xxxxx xxxxxxx xxxxx:> xxxxx > > /xxxxx > -- > xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ > `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx?/xxxxx -- xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx?>From xxxxx at xx.xxx.xx Mon Mar 12 12:00:20 2018Return-Path: <xxxxx at xx.xxx.xx> X-Original-To: xxxxx at xx.xxx.xx Delivered-To: xxxxx at xx.xxx.xx Received: xxxx xxxxxxxxx (xxxxxxxxx [xxx.x.x.x]) xx xxxxxxx-xxx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) X-Virus-Scanned: xxxxxx xxxxxxx-xxx xx xx.xxx.xx Received: xxxx xxxx.xx.xxx.xx ([xxx.x.x.x]) xx xxxxxxxxx (xxxx-xx.xx.xxx.xx [xxx.x.x.x]) (xxxxxxx-xxx, xxxx xxxxx) xxxx xxxx xx xxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xxxx xxxxxxxxxxx.xx.xxx.xx (xxxxxxxxxxx.xx.xxx.xx [xxx.xxx.xx.xx]) xx xxxx.xx.xxx.xx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xx xxxxxxxxxxx.xx.xxx.xx (xxxxxxx, xxxx xxxxxx xxxxxx) xx xxxxxxx; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Date: Mon, 12 Mar 2018 12:00:14 +0100 From: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> To: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> Subject: xx: xxxxx Message-ID: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> References: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> MIME-Version: x.x Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> User-Agent: xxxxxxx/xxxxxxxx (x.x.x) Content-Length: 524 Lines: xx xx xx xxxxx, xxxx - xxxxx xxxxxxx xxxxx:> xxxxxx > > xx xx xxxxx, xxxx - xxxxx xxxxxxx xxxxx: > > > xxxxx > > > > /xxxxx > > -- > > xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ > > `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx? > > /xxxxx > -- > xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ > `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx?/xxxxx -- xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx?>From xxxxx at xx.xxx.xx Mon Mar 12 12:00:28 2018Return-Path: <xxxxx at xx.xxx.xx> X-Original-To: xxxxx at xx.xxx.xx Delivered-To: xxxxx at xx.xxx.xx Received: xxxx xxxxxxxxx (xxxxxxxxx [xxx.x.x.x]) xx xxxxxxx-xxx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) X-Virus-Scanned: xxxxxx xxxxxxx-xxx xx xx.xxx.xx Received: xxxx xxxx.xx.xxx.xx ([xxx.x.x.x]) xx xxxxxxxxx (xxxx-xx.xx.xxx.xx [xxx.x.x.x]) (xxxxxxx-xxx, xxxx xxxxx) xxxx xxxx xx xxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xxxx xxxxxxxxxxx.xx.xxx.xx (xxxxxxxxxxx.xx.xxx.xx [xxx.xxx.xx.xx]) xx xxxx.xx.xxx.xx (xxxxxxx) xxxx xxxxx xx xxxxxxxxxxxxx xxx <xxxxx at xx.xxx.xx>; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Received: xx xxxxxxxxxxx.xx.xxx.xx (xxxxxxx, xxxx xxxxxx xxxxxx) xx xxxxxxx; xxx, xx xxx xxxx xx:xx:xx +xxxx (xxx) Date: Mon, 12 Mar 2018 12:00:23 +0100 From: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> To: xxxxx xxxxxxx <xxxxx at xx.xxx.xx> Subject: xxxxx Message-ID: <xxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx at xx.xxx.xx> MIME-Version: x.x Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: xxxxxxx/xxxxxxxx (x.x.x) Content-Length: 134 Lines: x xxxxx /xxxxx -- xxxxx xxxxxxx, xxxxx at xx.xxx.xx, xxxx://xxxxxx.xx.xxx.xx/xxxxx/ `- xxxxxxxx xx xxxxxxxxx xxxxxxx, xxxxxxxxxx xx xxx?
Aki Tuomi
2018-Mar-21 06:50 UTC
Race condition when setting flags (\Deleted) + expunge quickly, leaving mails not deleted
Thank you for your thorough report, we'll look into it. Aki On 20.03.2018 16:56, Tomas Forsman wrote:> 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
2018-Apr-22 15:55 UTC
Race condition when setting flags (\Deleted) + expunge quickly, leaving mails not deleted
On 21 March, 2018 - Aki Tuomi wrote:> Thank you for your thorough report, we'll look into it.Has anyone managed to reproduce this (using my transcript for example)? With mutt, I get this problem.. If I set 'imap_pipeline_depth=0' in .muttrc, I can't seem to reproduce it anymore. /Tomas -- Tomas Forsman, stric at cs.umu.se, http://people.cs.umu.se/stric/ `- SysAdmin at Computing Science, University of Ume?> Aki > > > On 20.03.2018 16:56, Tomas Forsman wrote: > > 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 >
Reasonably Related Threads
- Race condition when setting flags (\Deleted) + expunge quickly, leaving mails not deleted
- Race condition when setting flags (\Deleted) + expunge quickly, leaving mails not deleted
- Bug#776094: dovecot-imapd: corrupts mailbox after trying to retrieve it (fwd)
- Bug#776094: dovecot-imapd: corrupts mailbox after trying to retrieve it (fwd)
- Bug#776094: dovecot-imapd: corrupts mailbox after trying to retrieve it (fwd)