> On 27 Sep 2018, at 21.52, Evan Klitzke <e...@eklitzke.org> wrote: > > I am using Dovecot 2.2.36 and I am trying to use doveadm backup to migrate > email from Gmail to Dovecot. When I run doveadm backup, it goes for a while > and then eventually hits an assertion error (I've tried this a few times now > and it happens reliably). > > The assertion failure looks like this: > > dsync(e...@eklitzke.org): Panic: file imapc-client.c: line 179 > (imapc_client_run_pre): assertion failed: (client->ioloop == NULL) > > The last few lines of log output before the crash look like this: > https://gist.github.com/eklitzke/9a0dd77c44a6ee33e812f85d5773c24c > > The GDB backtrace when the program panics looks like this: > https://gist.github.com/eklitzke/6b311474b08b546c462e0444c5cf479b
Looks like it crashes when: - you have multiple folders - dsync takes over 1 second between folders - a new mail arrives during dsync - you have imapc_features=gmail-migration A simple workaround should be to comment out "list->refreshed_mailboxes_recently = FALSE" in imapc-sync.c. A better fix would probably be to remember an opened folder's mailbox_info_flags so it doesn't try to re-get them.
