External POP3 Fetcher - DELE without RETR - crashing frequently

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External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-04-29 19:31

Since version HMS 5.6.7-B2427 (x64) I have massive problems with refetching of old - already delivered emails - when fetcher tries to delete them during POP3fetch without getting new mails at the same time (like described here: https://www.hmailserver.com/forum/viewt ... 10&t=32493). And it continues with HMS 5.7.0-B2428 (x64), hoped that it will fix it for me. On some days there are 20-30 emails reappearing at some accounts and users get stressed abut that.
Not sure to which version I could switch safely or how to find a version in which it has already been fixed as it seems that a solution is already available (refering to the mentioned thread above).
Any advice?
Thank you very much in advance!
Any more info needed?

hmailserver_2019-04-29.log:

Code: Select all

"DEBUG"	64544	"2019-04-29 12:06:19.603"	"Adding task ExternalFetchTask to work queue External fetch queue"
"DEBUG"	54760	"2019-04-29 12:06:19.603"	"Executing task ExternalFetchTask in work queue External fetch queue"
"DEBUG"	54760	"2019-04-29 12:06:19.603"	"Retrieving messages from external account info@XXXXXX.de"
"DEBUG"	54760	"2019-04-29 12:06:19.603"	"Pre-creating session 9294"
"DEBUG"	60648	"2019-04-29 12:06:19.634"	"TCP connection started for session 9294"
"DEBUG"	60648	"2019-04-29 12:06:19.634"	"Performing SSL/TLS handshake for session 9294. Verify certificate: True, Expected remote host name: pop.XXXXXX.de"
"DEBUG"	45628	"2019-04-29 12:06:19.806"	"Certificate verification succeeded for session 9294."
"POP3C"	45628	9294	"2019-04-29 12:06:19.915"	"XX.XXX.XX.X"	"RECEIVED: +OK Hello there."
"POP3C"	45628	9294	"2019-04-29 12:06:19.915"	"XX.XXX.XX.X"	"SENT: USER info@XXXXXXX.de"
"POP3C"	52092	9294	"2019-04-29 12:06:19.931"	"XX.XXX.XX.X"	"RECEIVED: +OK Password required."
"POP3C"	52092	9294	"2019-04-29 12:06:19.931"	"XX.XXX.XX.X"	"SENT: ***"
"POP3C"	52092	9294	"2019-04-29 12:06:20.009"	"XX.XXX.XX.X"	"RECEIVED: +OK logged in."
"DEBUG"	24076	"2019-04-29 12:06:20.009"	"Completed retrieval of messages from external account."
"POP3C"	52092	9294	"2019-04-29 12:06:20.009"	"XX.XXX.XX.X"	"SENT: UIDL"
"DEBUG"	6444	"2019-04-29 12:06:20.024"	"Completed retrieval of messages from external account."
"POP3C"	9724	9294	"2019-04-29 12:06:20.149"	"XX.XXX.XX.X"	"SENT: DELE 159"
"POP3C"	50260	9294	"2019-04-29 12:06:20.181"	"XX.XXX.XX.X"	"RECEIVED: +OK Deleted."
"ERROR"	50260	"2019-04-29 12:06:20.181"	"Severity: 3 (Medium), Code: HM5136, Source: TCPConnection::AsyncReadCompleted, Description: An error occured while parsing data. Data size: 0 Remote IP: XX.XXX.XX.X"
"DEBUG"	50260	"2019-04-29 12:06:20.181"	"Ending session 9294"
"DEBUG"	54760	"2019-04-29 12:06:20.181"	"Completed retrieval of messages from external account."
"ERROR"	50260	"2019-04-29 12:06:20.181"	"Severity: 2 (High), Code: HM4208, Source: ExceptionHandler::Run, Description: An error occured while executing 'IOCPQueueWorkerTask'"
"DEBUG"	50260	"2019-04-29 12:06:20.181"	"Logging exception.."
"ERROR"	50260	"2019-04-29 12:06:20.633"	"Severity: 1 (Critical), Code: HM5519, Source: StackLogger::Log, Description: An error has been detected. A mini dump has been written to C:\Program Files (x86)\hMailServer\Logs\minidump_2019-04-29 120620_{072557AB-7A3F-44FB-899A-0EAB902857DE}.dmp"
"DEBUG"	50260	"2019-04-29 12:06:20.633"	"Completed logging of exception..."
ERROR_hmailserver_2019-04-29.log:

Code: Select all

"ERROR"	50260	"2019-04-29 12:06:20.181"	"Severity: 3 (Medium), Code: HM5136, Source: TCPConnection::AsyncReadCompleted, Description: An error occured while parsing data. Data size: 0 Remote IP: XX.XXX.XX.X"
"ERROR"	50260	"2019-04-29 12:06:20.181"	"Severity: 2 (High), Code: HM4208, Source: ExceptionHandler::Run, Description: An error occured while executing 'IOCPQueueWorkerTask'"
"ERROR"	50260	"2019-04-29 12:06:20.633"	"Severity: 1 (Critical), Code: HM5519, Source: StackLogger::Log, Description: An error has been detected. A mini dump has been written to C:\Program Files (x86)\hMailServer\Logs\minidump_2019-04-29 120620_{072557AB-7A3F-44FB-899A-0EAB902857DE}.dmp"
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minidump_2019-04-29 120620_{072557AB-7A3F-44FB-899A-0EAB902857DE}.dmp.zip
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-05-25 13:30

@Dravion:
It seems that there even already exists a fix for this issue:
https://github.com/Dravion/hMailServer/issues/1
https://github.com/hmailserver/hmailser ... n:DELE_fix

Any chance to get this solved in your version? I was not able to create a pull request from sprintman repo.

For us it is even getting worse: we have a forward configured in hms to an external address and when the error happens and old emails reappear and get back to delivery they also are forwarded again. And this leads to an error replay to the initial sender. So some customers now get failure emails on very old emails about message already exists.

I would extremly happy for any help on this :-)
Thank you so much in advance!
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by Dravion » 2019-05-25 17:31

Hi,
Can you first try this version

https://github.com/Dravion/hMailServer/ ... SL-x64.exe

In some cases the LibreSSL version works more robust on the 64-Bit version.

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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-05-25 18:28

Hi Dravion,

thank you for your reply and the hint. I downloaded and installed the LibreSSL x64 version and installed it (btw. it shows 5.7.0-B2429 in Status dialogue ;-) ).
I will check for errors and let you know.

Thanks again and best regards
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-05-25 18:52

Sorry, no luck :(
Set external pop3 fetcher to "delete after 30 days" (before it was "delete after 31 days") to get a result immediately and it just crashed again on the next try without new mails to fetch from pop3 server:

Code: Select all

"TCPIP"	85412	"2019-05-25 18:36:44.579"	"TCPConnection - TLS/SSL handshake completed. Session Id: 172, Remote IP: xx.xxx.xx.x, Version: TLSv1.2, Cipher: AES128-GCM-SHA256, Bits: 128"
"POP3C"	85412	172	"2019-05-25 18:36:44.635"	"xx.xxx.xx.x"	"RECEIVED: +OK Hello there."
"POP3C"	85412	172	"2019-05-25 18:36:44.636"	"xx.xxx.xx.x"	"SENT: USER xxx@xxx.de"
"POP3C"	85452	172	"2019-05-25 18:36:44.643"	"xx.xxx.xx.x"	"RECEIVED: +OK Password required."
"POP3C"	85452	172	"2019-05-25 18:36:44.645"	"xx.xxx.xx.x"	"SENT: ***"
"POP3C"	85412	172	"2019-05-25 18:36:44.689"	"xx.xxx.xx.x"	"RECEIVED: +OK logged in."
"POP3C"	85412	172	"2019-05-25 18:36:44.690"	"xx.xxx.xx.x"	"SENT: UIDL"
"POP3C"	72656	172	"2019-05-25 18:36:44.776"	"xx.xxx.xx.x"	"SENT: DELE 839"
"POP3C"	85456	172	"2019-05-25 18:36:44.787"	"xx.xxx.xx.x"	"RECEIVED: +OK Deleted."
"ERROR"	85456	"2019-05-25 18:36:44.789"	"Severity: 3 (Medium), Code: HM5136, Source: TCPConnection::AsyncReadCompleted, Description: An error occured while parsing data. Data size: 0 Remote IP: xx.xxx.xx.x"
"DEBUG"	85456	"2019-05-25 18:36:44.795"	"Ending session 172"
"DEBUG"	85564	"2019-05-25 18:36:44.795"	"Completed retrieval of messages from external account."
"ERROR"	85456	"2019-05-25 18:36:44.796"	"Severity: 2 (High), Code: HM4208, Source: ExceptionHandler::Run, Description: An error occured while executing 'IOCPQueueWorkerTask'"
"DEBUG"	85456	"2019-05-25 18:36:44.798"	"Logging exception.."
"ERROR"	85456	"2019-05-25 18:36:45.505"	"Severity: 1 (Critical), Code: HM5519, Source: StackLogger::Log, Description: An error has been detected. A mini dump has been written to C:\Program Files (x86)\hMailServer\Logs\minidump_2019-05-25 183644_{DBD6DC5D-F9F4-4077-A01F-2C232211FC2E}.dmp"
"DEBUG"	85456	"2019-05-25 18:36:45.507"	"Completed logging of exception..."
Any other ideas?
Once I delete these old messages (here it says a total number of 839) from the pop3 server directly in webmail the error does not happen!
But as this server has no option to do an automatic deletion after a period of time within webmail it is no solution. I am only able to use the option in HMS.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-08-09 07:57

Hi there,
any other hints on how to find the root cause or how to fix this problem?
Many thanks in advance for every response.
@martin: maybe it is just a simple oneliner like described here? https://github.com/hmailserver/hmailserver/issues/253
Best regards
Daniel
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by Dravion » 2019-08-09 08:57

Please be patient.
The LTS version is retiring. There is an official 64-Bit Release underway.

Meanwhile dont use POP3 if not absolutely necessary
to avoid this Problem.

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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-09 13:10

I will check this the next couple of days.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-08-12 18:56

Thanks very much to both of you!
Sorry for having asked again but I was waiting for a very long time now (at least felt) and tried out several things on my own without success.
And of course for the affected users it is really annoying to get old emails again and again every day ;-) I would really like to get them out of this - especially as it seems that it already exist an "easy" fix for this.
So sorry again for maybe being a little bit impatient ;-)
I apologize for that.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-13 11:38

There will be an updated version of hMailServer 5.6.8 today with the fix included.

Not really clear what version you're using though. Are you currently using the experimental 5.7-build created by Dravion in production? If so I could create a new 5.7-build as well. But I wouldn't use 5.7 in production yet...
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-13 12:24

The new 5.6.8 build with the fix applied is included here:
https://build.hmailserver.com/viewLog.h ... =artifacts

But if you're already using a newer experimental build, you can't install this one. So need to know what you're currently running.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by RvdH » 2019-08-13 12:25

martin wrote:
2019-08-13 12:24
The new 5.6.8 build with the fix applied is included here:
https://build.hmailserver.com/viewLog.h ... =artifacts

But if you're already using a newer experimental build, you can't install this one. So need to know what you're currently running.
Check his signature ;)
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-13 12:32

Yea, I saw his signature but that doesn't tell me for sure that he's using that version on the server where he's seeing the issue in production. If he is using that build, he's technically using a fork of hMailServer (and not hMailServer), but he wants a fix for hMailServer so that's what's confusing me. :)

I have put up a 5.7-build here. But this is still in alpha (has passed regression tests though)...
https://build.hmailserver.com/viewLog.h ... =artifacts
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by RvdH » 2019-08-13 13:00

BTW, was that fix even necessary for the 5.6.x branch?
I believe that issue was introduced with the Handling of long UIDL response lists was too slow that is only part of the 5.7 branch code

And as you're updating the 5.7.x build instructions/readme, https://github.com/hmailserver/hmailser ... 6#comments
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-13 14:06

Ah, you're right. The fix was not necessary for 5.6.x-branch - I reverted it. This experimental 5.7.0-build has made me a bit confused.

I'll check the build instructions.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by RvdH » 2019-08-13 14:19

Something is off...
you reverted that changes in 'master' branch as well it seems :?:
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-13 14:56

Wow, I think I should step away from the keyboard today. :)
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by RvdH » 2019-08-13 14:57

:lol:
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-08-13 17:58

Hey guys,
sorry for the confusion! I am very confused too :?
I switched to Dravions version (https://github.com/Dravion/hMailServer/ ... SL-x64.exe) at some time when trying to get rid of the error. Can't remember when and with which version I catched it.
So I am on 5.7 somehow now, meaning my database version says 5700 and I am not able to install 5.6.8 as you mentioned.
But as it is already a mess with the crashing I will simply try installing your 5.7 build from today and test it. Beside this everything seems to work very well ;-)
Or would you recommend another way?
Thanks to all of you taking care and spending your time :-)
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-08-15 07:55

Hi folks,
successfully switched to 5.7.0-B2468 now. But sadly after about 10 minutes again minidumps have been created and it keeps crashing.
Anyone interested in log entries or minidump(s)? ;-) :-(
Best regards
derelvis
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by RvdH » 2019-08-15 08:40

5.7.0-B2468 you say? Why did you pick that version?
That version did not contain the supposedly fix, as something went wrong reverting the unnecessary commit in the 5.6.8 branch

Try 5.7.0-B2469 (you could have picked 5.7.0-B2464, 5.7.0-B2466 or 5.7.0-B2469...anyone of those, except 5.7.0-B2468 you seem to have picked!)
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-08-15 10:12

Oh damn :?
Maybe because it was to early or I was too fast or I did not get the problem with this build or just because I use Team City for the first time :wink:
Sorry, backing up all again and installing build 2469 of 5.7.0 right now...
Thanks for the hint!! Will keep you updated.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by martin » 2019-08-15 21:30

Did it work better now? If you are still getting some minidumps please send to me on martin@hmailserver.com for analysis.
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently - SOLVED

Post by derelvis » 2019-08-15 22:23

Server is running for about 12 hours now on version 5.7.0-B2469 without any single issue :!: :-)
I had a very close look at the logfiles during this time period and all seems to be back to normal finally.
Will keep an eye on it but so having a really good feeling I already mark the thread as solved.

Again thank you so much for giving me the chance of testing the build/fix!
If I find anything else I will let you know ;-)

Best regards and wishes to all

====================

SOLVED with HMS 5.7.0-B2469
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by ap44 » 2019-08-15 22:59

I've tested the 64bit build 5.7.0-B2469 (on a Windows Server 2016 machine) and got problems with fetching from external pop3 accounts.
Also an error on Diagnostics in part 'Test outbound port', tls or so?
Switched fast to the latest 32bit build and all is fine again.
Sorry, but I deleted all logs an have no further informations. :(
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by derelvis » 2019-08-18 09:41

So as I can see in the other thread you now have successfully switched to 5.7.0. Was it some kind of configuration problem? Do you remember what fixed it?
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Re: External POP3 Fetcher - DELE without RETR - crashing frequently

Post by ap44 » 2019-08-18 14:17

I haven't found the cause yet. So far everything runs very stable and there are no problems to retrieve the mails.
After I had problems, I went back to version 5.6.8. Since Martin created new builds for 5.7, I dared to do it again.
What do you want me to say? It's on. :)

Probably it's really related to this: https://github.com/hmailserver/hmailserver/issues/217

But I really recommend to make a full backup/restore upgrade to 5.7 and not to move or copy the data or similar.
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