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IMAP IDLE push dies intermittently

See original GitHub issue

Checklist

I have used the search function to see if someone else has already submitted the same bug report.
I will describe the problem with as much detail as possible.

App version

6.000

Where did you get the app from?

Google Play

Android version

Device model

No response

Steps to reproduce

I’m connected to the imap server
With IDLE refresh set to 24 minutes (default)
And “Max folders to check with push” set to 5
k9 works fine for days on end with push notifications to my Inbox working great
Then all of a sudden, I stop receiving new mail unless I manually refresh my Inbox.

Expected behavior

Expect to keep getting messages pushed to my Inbox

Actual behavior

Stop receiving emails

Logs

I’d like some help with understanding how to capture useful info since it takes days for this problem to manifest. However, this is what I see when I refresh my inbox manually after emails stop getting pushed. Killing k9 on my phone and restarting, fixes the problem for a few days until it happens again. I’ve tried playing around with IDLE refresh times but that doesn’t seem to help. Reducing # of max push folders to 5 seems to increase the time between failures.

Not sure it has anything to do with this, but for completeness, I access the same mailbox from a different client on the desktop that also uses IMAP IDLE (refresh set to 15 minutes) and it continues to work fine, pushing emails.

04-25 12:09:41.972  6735  6775 V RealImapConnection: conn189706754<<<#45# [OK, UID FETCH completed]
04-25 12:09:42.579  6735  6775 D ImapSync: SYNC: Synced remote messages for folder INBOX, 1 new messages
04-25 12:09:42.613  6735  6775 D ImapSync: Done synchronizing folder Work:INBOX @ Mon Apr 25 12:09:42 CDT 2022
04-25 12:09:42.616  6735  6775 I ImapSync: Done synchronizing folder Work:INBOX
04-25 12:09:42.616  6735  6775 V ImapSync: Saving new highest known UID: 1120117
04-25 12:09:42.623  6735  6775 I MessagingController:  Command 'synchronizeMailbox' completed
04-25 12:09:42.623  6735  6775 I MessagingController: Running command 'sendPendingMessages', seq = 219 (background priority)
04-25 12:09:42.625  6735  6775 I MessagingController:  Command 'sendPendingMessages' completed

Just before the above, everything seems ok, but I don’t get any emails showing up in k9:

04-25 12:09:41.859  6735  6775 V RealImapConnection: conn189706754<<<#44# [OK, UID FETCH completed]
04-25 12:09:41.860  6735  6775 V RealImapConnection: conn189706754>>> 45 UID FETCH 1113984,1113981,1113980,1113976,1113974,1113973,1113972,1113969,1113965,1113963,1113961,1113957,1113953,1113946,1113944,1113943,1113942,1113940,1113939,1113937,1113936,1113935,1113934,1113933,1113928,1113927,1113925,1113924,1113923,1113921,1113920,1113919,1113916,1113915,1113913,1113912,1113911,1113909,1113906,1113903,1113901,1113898,1113897,1113895,1113894,1113892,1113891,1113889,1113888 (UID FLAGS)
04-25 12:09:41.905  6735  6775 V RealImapConnection: conn189706754<<<#null# [24120, FETCH, [UID, 1113888, FLAGS, [\Seen]]]
04-25 12:09:41.907  6735  6775 V RealImapConnection: conn189706754<<<#null# [24121, FETCH, [UID, 1113889, FLAGS, [\Seen]]]
04-25 12:09:41.908  6735  6775 V RealImapConnection: conn189706754<<<#null# [24122, FETCH, [UID, 1113891, FLAGS, [\Seen]]]
04-25 12:09:41.908  6735  6775 V RealImapConnection: conn189706754<<<#null# [24123, FETCH, [UID, 1113892, FLAGS, [\Seen]]]
04-25 12:09:41.909  6735  6775 V RealImapConnection: conn189706754<<<#null# [24124, FETCH, [UID, 1113894, FLAGS, [\Seen]]]
04-25 12:09:41.910  6735  6775 V RealImapConnection: conn189706754<<<#null# [24125, FETCH, [UID, 1113895, FLAGS, [\Seen]]]
04-25 12:09:41.910  6735  6775 V RealImapConnection: conn189706754<<<#null# [24126, FETCH, [UID, 1113897, FLAGS, [\Seen]]]
04-25 12:09:41.911  6735  6775 V RealImapConnection: conn189706754<<<#null# [24127, FETCH, [UID, 1113898, FLAGS, [\Seen]]]
04-25 12:09:41.912  6735  6775 V RealImapConnection: conn189706754<<<#null# [24128, FETCH, [UID, 1113901, FLAGS, [\Seen]]]
04-25 12:09:41.912  6735  6775 V RealImapConnection: conn189706754<<<#null# [24129, FETCH, [UID, 1113903, FLAGS, [\Seen]]]
04-25 12:09:41.913  6735  6775 V RealImapConnection: conn189706754<<<#null# [24130, FETCH, [UID, 1113906, FLAGS, [\Seen]]]
04-25 12:09:41.914  6735  6775 V RealImapConnection: conn189706754<<<#null# [24131, FETCH, [UID, 1113909, FLAGS, [\Answered, \Seen]]]
04-25 12:09:41.914  6735  6775 V RealImapConnection: conn189706754<<<#null# [24132, FETCH, [UID, 1113911, FLAGS, [\Seen]]]
04-25 12:09:41.915  6735  6775 V RealImapConnection: conn189706754<<<#null# [24133, FETCH, [UID, 1113912, FLAGS, [\Seen]]]
04-25 12:09:41.915  6735  6775 V RealImapConnection: conn189706754<<<#null# [24134, FETCH, [UID, 1113913, FLAGS, [\Seen]]]
04-25 12:09:41.916  6735  6775 V RealImapConnection: conn189706754<<<#null# [24135, FETCH, [UID, 1113915, FLAGS, [\Seen]]]
04-25 12:09:41.917  6735  6775 V RealImapConnection: conn189706754<<<#null# [24136, FETCH, [UID, 1113916, FLAGS, [\Seen]]]
04-25 12:09:41.918  6735  6775 V RealImapConnection: conn189706754<<<#null# [24137, FETCH, [UID, 1113919, FLAGS, [\Seen]]]
04-25 12:09:41.919  6735  6775 V RealImapConnection: conn189706754<<<#null# [24138, FETCH, [UID, 1113920, FLAGS, [\Seen]]]
04-25 12:09:41.920  6735  6775 V RealImapConnection: conn189706754<<<#null# [24139, FETCH, [UID, 1113921, FLAGS, [\Seen]]]
04-25 12:09:41.921  6735  6775 V RealImapConnection: conn189706754<<<#null# [24140, FETCH, [UID, 1113923, FLAGS, [\Seen]]]
04-25 12:09:41.921  6735  6775 V RealImapConnection: conn189706754<<<#null# [24141, FETCH, [UID, 1113924, FLAGS, [\Answered, \Seen]]]
04-25 12:09:41.922  6735  6775 V RealImapConnection: conn189706754<<<#null# [24142, FETCH, [UID, 1113925, FLAGS, [\Seen]]]
04-25 12:09:41.954  6735  6775 V RealImapConnection: conn189706754<<<#null# [24143, FETCH, [UID, 1113927, FLAGS, [\Seen]]]
04-25 12:09:41.955  6735  6775 V RealImapConnection: conn189706754<<<#null# [24144, FETCH, [UID, 1113928, FLAGS, [\Answered, \Seen]]]
04-25 12:09:41.955  6735  6775 V RealImapConnection: conn189706754<<<#null# [24145, FETCH, [UID, 1113933, FLAGS, [\Seen]]]
04-25 12:09:41.956  6735  6775 V RealImapConnection: conn189706754<<<#null# [24146, FETCH, [UID, 1113934, FLAGS, [\Seen]]]
04-25 12:09:41.956  6735  6775 V RealImapConnection: conn189706754<<<#null# [24147, FETCH, [UID, 1113935, FLAGS, [\Seen]]]
04-25 12:09:41.957  6735  6775 V RealImapConnection: conn189706754<<<#null# [24148, FETCH, [UID, 1113936, FLAGS, [\Answered, \Seen]]]
04-25 12:09:41.958  6735  6775 V RealImapConnection: conn189706754<<<#null# [24149, FETCH, [UID, 1113937, FLAGS, [\Seen]]]
04-25 12:09:41.958  6735  6775 V RealImapConnection: conn189706754<<<#null# [24150, FETCH, [UID, 1113939, FLAGS, [\Answered, \Seen]]]
04-25 12:09:41.959  6735  6775 V RealImapConnection: conn189706754<<<#null# [24151, FETCH, [UID, 1113940, FLAGS, [\Seen]]]
04-25 12:09:41.960  6735  6775 V RealImapConnection: conn189706754<<<#null# [24152, FETCH, [UID, 1113942, FLAGS, [\Seen]]]
04-25 12:09:41.961  6735  6775 V RealImapConnection: conn189706754<<<#null# [24153, FETCH, [UID, 1113943, FLAGS, [\Seen]]]
04-25 12:09:41.961  6735  6775 V RealImapConnection: conn189706754<<<#null# [24154, FETCH, [UID, 1113944, FLAGS, [\Seen]]]
04-25 12:09:41.962  6735  6775 V RealImapConnection: conn189706754<<<#null# [24155, FETCH, [UID, 1113946, FLAGS, [\Seen]]]
04-25 12:09:41.962  6735  6775 V RealImapConnection: conn189706754<<<#null# [24156, FETCH, [UID, 1113953, FLAGS, [\Seen]]]
04-25 12:09:41.963  6735  6775 V RealImapConnection: conn189706754<<<#null# [24157, FETCH, [UID, 1113957, FLAGS, [\Seen]]]
04-25 12:09:41.964  6735  6775 V RealImapConnection: conn189706754<<<#null# [24158, FETCH, [UID, 1113961, FLAGS, [\Seen]]]
04-25 12:09:41.964  6735  6775 V RealImapConnection: conn189706754<<<#null# [24159, FETCH, [UID, 1113963, FLAGS, [\Seen]]]
04-25 12:09:41.965  6735  6775 V RealImapConnection: conn189706754<<<#null# [24160, FETCH, [UID, 1113965, FLAGS, [\Seen]]]
04-25 12:09:41.965  6735  6775 V RealImapConnection: conn189706754<<<#null# [24161, FETCH, [UID, 1113969, FLAGS, [\Seen]]]
04-25 12:09:41.966  6735  6775 V RealImapConnection: conn189706754<<<#null# [24162, FETCH, [UID, 1113972, FLAGS, [\Seen]]]
04-25 12:09:41.967  6735  6775 V RealImapConnection: conn189706754<<<#null# [24163, FETCH, [UID, 1113973, FLAGS, [\Seen]]]
04-25 12:09:41.968  6735  6775 V RealImapConnection: conn189706754<<<#null# [24164, FETCH, [UID, 1113974, FLAGS, [\Seen]]]
04-25 12:09:41.968  6735  6775 V RealImapConnection: conn189706754<<<#null# [24165, FETCH, [UID, 1113976, FLAGS, [\Seen]]]
04-25 12:09:41.969  6735  6775 V RealImapConnection: conn189706754<<<#null# [24166, FETCH, [UID, 1113980, FLAGS, [\Seen]]]
04-25 12:09:41.970  6735  6775 V RealImapConnection: conn189706754<<<#null# [24167, FETCH, [UID, 1113981, FLAGS, [\Seen]]]

Issue Analytics

State:
Created a year ago
Comments:8 (3 by maintainers)

Top GitHub Comments

1reaction

cketticommented, Apr 25, 2022

Most servers have a limit of how many connections per user they allow. Usually this manifests as an error during authentication. After an authentication error, K-9 Mail’s Push code will back off and only retry an hour later.

“Too many open connections” is a condition that could happen if the Android device frequently loses and regains connectivity. From the point of view of the server the old connections will remain open until the server’s IDLE timeout is reached, even if there’s nobody on the other side of the connection anymore.

0reactions

J0nnyMak0commented, May 17, 2022

I suspect that the original reporter of this problem and I both just see the results of our cellphones trying to save some energy.

Nope. Sorry, not in my case. Should have mentioned it, I took K-9 off battery optimization. From the log above it looks like there actually is some sort of an abort? Not sure if “Software caused connection abort” is server side or client side.

04-26 15:34:37.127 19644 19694 V AndroidPowerManager$AndroidWakeLock: AndroidWakeLock for tag ImapFolderPusher-Work-Deleted Messages / id 9: acquired with no timeout.
04-26 15:34:37.134 19644 19694 V ImapFolderPusher: Exception in ImapFolderPusher
04-26 15:34:37.134 19644 19694 V ImapFolderPusher: javax.net.ssl.SSLException: Read error: ssl=0x77724fd388: I/O error during system call, Software caused connection abort
04-26 15:34:37.134 19644 19694 V ImapFolderPusher:      at com.android.org.conscrypt.NativeCrypto.SSL_read(Native Method)
04-26 15:34:37.134 19644 19694 V ImapFolderPusher:      at com.android.org.conscrypt.NativeSsl.read(NativeSsl.java:411)
04-26 15:34:37.134 19644 19694 V ImapFolderPusher:      at com.android.org.conscrypt.ConscryptFileDescriptorSocket$SSLInputStream.read(ConscryptFileDescriptorSocket.java:549)