Panic: IMAP(user): file mail-index-sync-update.c: line 843 (mail_index_sync_map): assertion failed: (map->hdr.indexid == index- >indexid || map->hdr.indexid == 0)

Can you get the values of map->hdr.indexid and index->indexid?

Core dumps are now enabled so if it happens again I'll try to retrieve these values.

looks like dovecot.index file was recreated by another Dovecot that
didn't know about the existing index files (which shouldn't really be
happening normally)

Even clustered over NFS? Is this assertion a symptom of not tuning for a shared mailstore properly ala http://wiki.dovecot.org/MailLocation/SharedDisk ?

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