1777912 - IMAP message downloads corrupted/partial

Status: RESOLVED DUPLICATE of bug 1777738

(Thunderbird :: Message Reader UI, defect, P1)

Description

[Adam Reece]

Attachment: tb102-message-headers-full.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0

Steps to reproduce:

Read a message from an IMAP account.

Actual results:

Some messages at random will not read entirely resulting in useless/corrupted display.

Screenshot shows a Gmail example, though the problem also occurs with other IMAP servers (e.g. Dovecot).

Interestingly if the message is moved to a different folder, not via Thunderbird (e.g. via Gmail, Roundcube, or other IMAP client), and then you view the same message in a different folder, it can sometimes resolve the issue. This probably forces another attempt to fully download the message again as Thunderbird won't have ever seen it in the new folder.

Expected results:

Message should have viewed without corruption.

Comment 1

[Adam Reece]

Attachment: tb102-message-headers-simple.png

Comment 2

[Adam Reece]

Attachment: tb102-message-source.png

Comment 3

[Adam Reece]

I should have mentioned: This started happening as of version 102 on both a personal and work Windows 10 computer.

Comment 4

[Adam Reece]

Interestingly this may not be a problem with IMAP specifically, but rather the message reader UI. (It's just that the majority of my mail accounts, particularly the busy ones, are IMAP based.) In the list of messages the grid columns (from, subject, ...) always seem to be showing correctly. When clicking into a message to see further into it then the view corruption happens in the headers section, body section, and when viewing the source.

Probably the key point here: Closing Thunderbird and deleting all MSF files for the account resolves this.
(Plucking a message that appears corrupted suddenly appears fine after an MSF purge.)

If it matters all my mailboxes are using mbox storage locally, though probably not as this is an index corruption issue.

Comment 5

[Adam Reece]

Possibly related in TB 102.0.1's release notes:

Mailbox MSF files could become corrupt in some circumstances

I will delete all my existing MSF files and watch out for this issue after.

Comment 6

[Adam Reece]

After a complete removal of MSFs since TB 102.0.1 I can safely say this is not resolved. I'd go as far to say it's got worse, more messages are appearing distorted than TB 102.

Comment 7

[Adam Reece]

This is possibly related to bug 1778353.

I hadn't tried manually compacting, but I did have the option enabled to automatically compact if it were to save at least 8 MB without prompting. I do see the status bar message about compacting regularly enough (most days).

Since 4 days ago I had turned off automatic compacting, and haven't seen the original issue occur so often for new emails. Existing emails that have the problem can also be resolved by moving them to a different folder, and optionally back to where it was before.

Comment 8

[Magnus Melin [:mkmelin]]

Looks like bug 1777738.