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Description of problem:
dsync panics when syncing a mailbox deletion. It was fixed up stream in 2.22.11 https://github.com/dovecot/core/commit/aea7f72aa97f0f3c2e181ab3ae432f2e22148f3b
Version-Release number of selected component (if applicable): 2.22.10-7
How reproducible: On an affected mailbox dsync will panic everytime
Actual results:
dsync(******): Panic: file dsync-brain-mailbox-tree-sync.c: line 111 (dsync_brain_mailbox_tree_sync_change): assertion failed: (brain->no_backup_overwrite)
dsync(******): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0x6a06e) [0x7f47a81cc06e] -> /usr/lib64/dovecot/libdovecot.so.0(default_fatal_handler+0x2a) [0x7f47a81cc0da] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f47a818452c] -> doveadm(dsync_brain_mailbox_tree_sync_change+0x442) [0x7f47a8df9262] -> doveadm(dsync_brain_recv_mailbox_tree_deletes+0x13b) [0x7f47a8df8d6b] -> doveadm(dsync_brain_run+0x4e3) [0x7f47a8df60a3] -> doveadm(+0x2e894) [0x7f47a8df3894] -> doveadm(+0x15b7b) [0x7f47a8ddab7b] -> doveadm(doveadm_mail_try_run+0x26c) [0x7f47a8ddb92c] -> doveadm(main+0x414) [0x7f47a8dda6d4] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f47a7dc2b35] -> doveadm(+0x15925) [0x7f47a8dda925]
Expected results: Backup of mailbox would complete cleanly
Additional info:
The fix upstream in 2.22.11 can be seen here: https://github.com/dovecot/core/commit/aea7f72aa97f0f3c2e181ab3ae432f2e22148f3b
Thanks for reporting this. Could you describe configuration and procedure how to reproduce this, so our QA team can create a test for this to make sure the fix is correct and it won't happen in the future?
Also, did you test the linked commit or it was just suggested to you that it should fix this problem?
Thanks
I backported 2.22.11 here: https://copr.fedorainfracloud.org/coprs/rgarth/
The bug is fixed in this version. But I cannot confirm that this particular commit was the fix.
We have a nightly backup of all of our mailboxes on one system. It is hard to trace where the actual problem is happening, but it looks like if a user deletes an mbox, that night the dovadm dsync will crash on that user.
I will setup another dovecot box, not in production and recreate the problem next week.
But I believe it should be as simple as running a dovadm backup of a MAILDIR, deleting a folder in that MAILDIR and then trying to run a second backup.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:3182