Dear Aki, I switched to "gz" now, since "zstd" also gave some errors on writing to files. I dont know if "xz" compression or "zstd" shreddered my MDBOX Files, but I lost 4 days of mail. (a couple of thousand mails). After restoring the backup (what was made after switching to version 2.3.11.3) I still have some broken mdfiles, but not too many. Interestingly always in the "Sent" Mailbox on a number of Users. I just can not go back to 20.08.2020 before I updated to 2.3.11.3 - too many emails would have been lost. So - the current status is 2.3.11.3, with "gz" compression. I force-synced and re-indexed all the mdbox files (250 GB), but still have some broken - please how can I fix those ? You stated : (In theory you could leave the existing mails xz-compressed, but best would be to re-compress everything via dsync so old mails can be read when we eventually remove xz support.) what is the optimal way to do that, expecially not loosing the index (?) for outlook/thunderbird, for third party tools that rely on some index/hash (dunno how exactly that works) ? Sep 3 08:33:25 lxc-imap dovecot: imap(mpaul)<48684><2/9E5mKuAezAqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 08:35:26 lxc-imap dovecot: imap(mpaul)<48089><YRio1GKuEdHAqKi3>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 08:35:26 lxc-imap dovecot: imap(mpaul)<49228><p/0g9WKuVdHAqKi3>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 08:35:26 lxc-imap dovecot: imap(mpaul)<49229><GMAm9WKuVtHAqKi3>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 08:35:27 lxc-imap dovecot: imap(mpaul)<49230><YYot9WKuV9HAqKi3>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) ... Sep 3 09:04:44 lxc-imap dovecot: imap(cpotzinger)<49040></X+P72KuUNHAqKi3>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:04:51 lxc-imap dovecot: imap(cpotzinger)<54382><eYT1XWOux9HAqKi3>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:04:59 lxc-imap dovecot: imap(cpotzinger)<54396><nKllXmOuyNHAqKi3>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:05:06 lxc-imap dovecot: imap(cpotzinger)<54409><m2TOXmOuydHAqKi3>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:05:12 lxc-imap dovecot: imap(cpotzinger)<54422><IP86X2OuytHAqKi3>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) ... Sep 3 09:08:58 lxc-imap dovecot: imap(cpotzinger)<54867><BtGtbGOu49HAqKi3>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:19:15 lxc-imap dovecot: imap(mpaul)<56030></kHNkWOuAO3AqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 09:29:41 lxc-imap dovecot: imap(cpotzinger)<57274><c4rCtWOuKuzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:29:47 lxc-imap dovecot: imap(cpotzinger)<57320><K3Uqt2OuLOzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:29:54 lxc-imap dovecot: imap(cpotzinger)<57333><e4aMt2OuLezAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:30:01 lxc-imap dovecot: imap(cpotzinger)<57346><JEfzt2OuLuzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:30:08 lxc-imap dovecot: imap(cpotzinger)<57360><mH1YuGOuMOzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:30:14 lxc-imap dovecot: imap(cpotzinger)<57382><IzLBuGOuMezAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:30:21 lxc-imap dovecot: imap(cpotzinger)<57397><q10kuWOuM+zAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:30:27 lxc-imap dovecot: imap(cpotzinger)<57410><CSuJuWOuNOzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:31:22 lxc-imap dovecot: imap(mpaul)<57525><TfoOvWOuWO3AqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 09:31:49 lxc-imap dovecot: imap(cpotzinger)<57423><Be/ruWOuNuzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:31:55 lxc-imap dovecot: imap(cpotzinger)<57584><yvXOvmOuQuzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:32:02 lxc-imap dovecot: imap(cpotzinger)<57597><e/8tv2OuQ+zAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:32:08 lxc-imap dovecot: imap(cpotzinger)<57611><BLSOv2OuROzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:32:19 lxc-imap dovecot: imap(cpotzinger)<57633><Ky0twGOuR+zAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:32:26 lxc-imap dovecot: imap(cpotzinger)<57646><ljSRwGOuS+zAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:32:33 lxc-imap dovecot: imap(cpotzinger)<57659><rn75wGOuT+zAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:32:39 lxc-imap dovecot: imap(cpotzinger)<57672><GP9jwWOuUuzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:33:45 lxc-imap dovecot: imap(mpaul)<57795><2CEwxWOubu3AqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 09:38:29 lxc-imap dovecot: imap(mpaul)<58347><CKyX1mOuie3AqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 09:38:32 lxc-imap dovecot: imap(mpaul)<58352><osHU1mOuiu3AqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Sep 3 09:38:44 lxc-imap dovecot: imap(cpotzinger)<54527><5ZpiYmOuBOfAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:38:51 lxc-imap dovecot: imap(cpotzinger)<58378><kAuN12OumuzAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) Sep 3 09:38:57 lxc-imap dovecot: imap(cpotzinger)<58392><xJLx12Oum+zAqKiU>: Error: Mailbox Sent: UID=29534: read(zlib(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703)) failed: read(/home/vmail/virtualmailboxes/cpotzinger/storage/m.4703) failed: Broken pipe (FETCH BODY[]) ... Am 26.08.2020 um 09:42 schrieb Robert Nowotny: I had 4 broken mdbox files for 4 different users. After deleting them, dovecot re-indexed, now everything is ok again. I can try to update tonight again to 2.3.11.3 and see if some broken files will appear again tomorrow. Am 25.08.2020 um 14:51 schrieb Aki Tuomi: On 25/08/2020 14:35 Robert Nowotny <rnowotny at rotek.at> <rnowotny at rotek.at> wrote: I get ZLIB Errors after dovecot upgrade from 2.3.10.1 to 2.3.11.3 Aug 21 15:27:34 lxc-imap dovecot: imap(acsida)<63870><jZk...>: Error: Mailbox Sent: UID=40826: read(zlib(/home/vmail/virtualmailboxes/acsida/storage/m.2409)) failed: read(/home/vmail/virtualmailboxes/acsida/storage/m.2409) failed: Broken pipe (FETCH BODY[]).... many of those entries.... after installing2.3.10.1 those files are still broken - but new files are working again. anything I can tweak or do ? Hi! Is it possible your mdbox file is corrupted? Can you share doveconf -n? Aki -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200908/cef79786/attachment-0001.html>
On 8. Sep 2020, at 12.35, Robert Nowotny <rnowotny1966 at gmail.com> wrote:> > > Dear Aki, > I switched to "gz" now, since "zstd" also gave some errors on writing to files.What kind of errors?> I dont know if "xz" compression or "zstd" shreddered my MDBOX Files, but I lost 4 days of mail. (a couple of thousand mails). > After restoring the backup (what was made after switching to version 2.3.11.3) I still have some broken mdfiles, but not too many. > Interestingly always in the "Sent" Mailbox on a number of Users. > > I just can not go back to 20.08.2020 before I updated to 2.3.11.3 - too many emails would have been lost. > > So - the current status is 2.3.11.3, with "gz" compression. > > I force-synced and re-indexed all the mdbox files (250 GB), but still have some broken - please how can I fix those ?Note that force-resync doesn't read through the mails to verify whether they are readable. It just verifies that the indexes and metadata is ok. The only way to verify that all mails are readable is to actually try to read all of their text (e.g. doveadm fetch -u user text mailbox Sent > /dev/null).> You stated : > > (In theory you could leave the existing mails xz-compressed, but best > would be to re-compress everything via dsync so old mails can be read > when we eventually remove xz support.) > > what is the optimal way to do that, expecially not loosing the index (?) for outlook/thunderbird, for third party tools that rely on some index/hash (dunno how exactly that works) ?IMAP clients use the folder's UIDVALIDITY and message UID numbers to preserve caches. Using dsync preserves these. See doveadm-sync man page. It's also in https://wiki.dovecot.org/Tools/Doveadm/Sync <https://wiki.dovecot.org/Tools/Doveadm/Sync> From your previous mail:> sudo doveadm backup -D -u "${mailbox_username}" "mdbox:/home/vmail/virtualmailboxes/${mailbox_username}_backup" > sudo service dovecot stop > sudo mv "/home/vmail/virtualmailboxes/${mailbox_username}" "/home/vmail/virtualmailboxes/${mailbox_username}_original" > sudo mv "/home/vmail/virtualmailboxes/${mailbox_username}_backup" "/home/vmail/virtualmailboxes/${mailbox_username}" > sudo service dovecot startThe problem is that in your config you have: mail_location = mdbox:/home/vmail/virtualmailboxes/%n:DIRNAME=dbox-Mails-nocollision-random-KOKxNmMJkEBeCitBhFwS You need to preserve the DIRNAME. So: sudo doveadm backup -D -u "${mailbox_username}" "mdbox:/home/vmail/virtualmailboxes/${mailbox_username}_backup:DIRNAME=dbox-Mails-nocollision-random-KOKxNmMJkEBeCitBhFwS" sudo service dovecot stop sudo mv "/home/vmail/virtualmailboxes/${mailbox_username}" "/home/vmail/virtualmailboxes/${mailbox_username}_original" sudo mv "/home/vmail/virtualmailboxes/${mailbox_username}_backup" "/home/vmail/virtualmailboxes/${mailbox_username}" sudo service dovecot start However, the dsync will likely fail as well because it can't read some of the mails. So you'll need to fix those in any case first. That's a bit trickier:> Sep 3 08:33:25 lxc-imap dovecot: imap(mpaul)<48684><2/9E5mKuAezAqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[])For example here the best fix would be to try to preserve the mail as best as possible: a) Preserve as much of the text as possible and expunge the broken mail: doveadm fetch -u mpaul text mailbox Sent uid 2171 > msg.broken doveadm expunge -u mpaul mailbox Sent uid 2171 doveadm save -u mpaul -m mailbox < msg.broken b) You could also see if the issue is that Dovecot just can't read a properly compressed email, or if the issue was that it wrote broken emails. You can extract the raw compressed mail with: doveadm -o mail_plugins=virtual fetch -u mpaul text mailbox Sent uid 2171 | tail -n +2 > msg.broken cat msg.broken | xz -d Also this way you can see if the broken mail is actually xz or zstd or zlib. It would be nice to know if there are any zstd or zlib compressed mails that have problems. We did a lot of stress testing with zstd and also with xz, but haven't been able to reproduce any problems. It's also strange that it says taht the error is "Broken pipe" - that doesn't indicate that the mail is corrupted but that there is something more strange going on. So perhaps you don't actually have any mails written as corrupted, but Dovecot is just somehow having trouble reading the mails. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200908/6e28b459/attachment.html>
> > On 8. Sep 2020, at 12.35, Robert Nowotny <rnowotny1966 at gmail.com <mailto:rnowotny1966 at gmail.com>> wrote: >> >> >> Dear Aki, >> I switched to "gz" now, since "zstd" also gave some errors on writing to files. > > What kind of errors?Probably this? : Panic: file ostream.c: line 287 (o_stream_sendv_int): assertion failed: (!stream->blocking)>> Sep 3 08:33:25 lxc-imap dovecot: imap(mpaul)<48684><2/9E5mKuAezAqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) > > Also this way you can see if the broken mail is actually xz or zstd or zlib. It would be nice to know if there are any zstd or zlib compressed mails that have problems. We did a lot of stress testing with zstd and also with xz, but haven't been able to reproduce any problems. It's also strange that it says taht the error is "Broken pipe" - that doesn't indicate that the mail is corrupted but that there is something more strange going on. So perhaps you don't actually have any mails written as corrupted, but Dovecot is just somehow having trouble reading the mails.I managed to reproduce this. The files aren't corrupted, it's just that reading is failing. The attached patch should fix the xz code and should make your files readable again. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200908/2e97e478/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: diff Type: application/octet-stream Size: 667 bytes Desc: not available URL: <https://dovecot.org/pipermail/dovecot/attachments/20200908/2e97e478/attachment.obj> -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200908/2e97e478/attachment-0001.html>