Panic: file mail-index-sync-update.c: line 250 (sync_expunge_range): assertion failed: (count > 0)

[Ralf Hildebrandt]

We're seeing this:

% doveadm force-resync -u USERNAME INBOX

doveadm(USERNAME): Panic: file mail-index-sync-update.c: line 250 (sync_expunge_range): assertion failed: (count > 0)
doveadm(USERNAME): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0x817ad) [0x33ab08317ad] -> /usr/lib64/dovecot/libdovecot.so.0(default_fatal_handler+0x3a)
[0x33ab08318ba] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0)
[0x33ab07d7570] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0xced79) 
[0x33ab0b7ad79] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_record+0xc67)
[0x33ab0b7ba07] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_map+0x1a4)
[0x33ab0b7bdf4] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_map+0x15c)
[0x33ab0b6b70c] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0xba44a) 
[0x33ab0b6644a] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0xba5e8)
[0x33ab0b665e8] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_open+0x88)
[0x33ab0b666f8] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0x45762)
[0x33ab0af1762] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mdbox_map_open_or_create+0x42)
[0x33ab0af1a92] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mdbox_storage_rebuild_in_context+0x10b)
[0x33ab0af839b] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mdbox_sync_begin+0x222)
[0x33ab0af61f2] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mdbox_sync+0x45)
[0x33ab0af67d5] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mdbox_storage_sync_init+0xa8)
[0x33ab0af68e8] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x3d)
[0x33ab0b2490d] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37)
[0x33ab0b24a87] -> doveadm(+0x1c0dc) [0x5a1f7f90dc] -> doveadm(+0x1bd1b) [0x5a1f7f8d1b] ->
doveadm(doveadm_mail_try_run+0x267) [0x5a1f7f9d37] -> doveadm(main+0x404) [0x5a1f7f5a64] ->
/lib64/libc.so.6(__libc_start_main+0xf5) [0x33ab042cd55] -> doveadm(+0x18cb9) [0x5a1f7f5cb9]


# doveadm quota get -u USERNAME
Quota name Type    Value   Limit         %
user       STORAGE  4587 3145728         0
user       MESSAGE     3       -         0
			   
The user has an EMPTY mailbox with 3 folders (when connecting via IMAP)

But looking in $HOME, I'm seeing:
# du -sh .
1.6G.

The user cannot receive mail:
Dec 10 14:09:57 lmtp(86133, USERNAME): Fatal: master: service(lmtp): child 86133 killed with signal 6 (core dumps disabled)
Dec 10 14:09:57 lmtp(106153, USERNAME): Fatal: master: service(lmtp): child 106153 killed with signal 6 (core dumps disabled)

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