occasional "Warning: lost track of 460840 pulled message(s)"

[Uwe Kleine-K. <uwe...@kl...>]

Hello,

from time to time I experience mbsync (from the 1.3.0-2.2 Debian 
package) saying:

Aug 04 07:31:13 taurus syncmail-work[1553327]: Warning: lost track of 
460840 pulled message(s)
Aug 04 07:31:14 taurus syncmail-work[1553327]: Socket error: secure 
write to tunnel 'ssh -W imap:143 ptz.ptx': Broken pipe

which results into mbsync taking several hours to resync and then 
notmuch to reindex the messages.

My .mbsyncrc looks as follows:

	IMAPAccount work
	Host imap.pengutronix.de
	PassCmd "pass show ssh/uk...@pe..."
	User ukl
	Tunnel "ssh -W imap:143 ptz.ptx"
	SSLType STARTTLS
	
	IMAPStore work-remote
	Account work
	
	MaildirStore work-local
	#Path /home/uwe/Maildir-work/
	Inbox /home/uwe/Maildir-work
	SubFolders Maildir++
	
	Channel work-inbox
	Master :work-remote:
	Slave :work-local:
	Create Both
	Remove Slave
	Patterns *
	SyncState *
	CopyArrivalDate yes
	
	Group work
	Channel work-inbox

It there something obvious I'm doing wrong? Any hint how to debug that?

Best regards
Uwe