On 18 Oct 2019, at 13.43, Tom Sommer via dovecot dovecot@dovecot.org wrote:
I am seeing a lot of errors since the upgrade, on multiple client accounts: Info: Connection closed: read(size=7902) failed: Connection reset by peer (UID FETCH running for 0.242 + waiting input/output for 108.816 secs, 60 B in + 24780576+8192 B out, state=wait-output) Using NFS storage (not running with the mail_nfs_index or mail_nfs_storage) Was something changed in terms of IO/Idle timeouts?
We are also seeing different I/O patterns since the upgrade, more I/O is being used than normal.
What was the previous version you were running?
This is mail_debug from one of the accounts in question:
Oct 18 13:39:37 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Debug: Mailbox INBOX: Mailbox opened because: SELECT Oct 18 13:39:37 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Debug: Mailbox INBOX: UID 17854: Opened mail because: prefetch Oct 18 13:39:37 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Debug: Mailbox INBOX: UID 17854: Opened mail because: full mail .. Oct 18 13:39:48 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Debug: Mailbox INBOX: UID 17947: Opened mail because: full mail
Quite a lot of mail downloads for a single session. I wonder if the user really had that many new mails or if they were being redownloaded for some reason?
Oct 18 13:40:56 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Debug: Mailbox Junk: Mailbox opened because: autoexpunge Oct 18 13:40:56 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Debug: Mailbox Junk E-mail: Mailbox opened because: autoexpunge Oct 18 13:40:56 imap(XXXX)<7552><ebbmyS2VPPFOxv4t>: Info: Connection closed: read(size=7902) failed: Connection reset by peer (UID FETCH running for 0.542 + waiting input/output for 78.357 secs, 60 B in + 39221480+8192 B out, state=wait-output) in=290 out=39401283 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=94 body_bytes=39210315
state=wait-output means Dovecot was waiting for client to read the data it is sending. In v2.3.7 there was some changes related to this, but were you previously successfully running v2.3.7? In v2.3.8 I can't really think of such changes.