Hi, I was trying to configure a namespace like this: 10-mail.conf namespace inbox { prefix = "iNBox." inbox = yes } And when a client connected, I got the panic below. Dovecot version is 2.3.4.1 (f79e8e7e4) on Debian 10. Aug 25 16:18:27 kman dovecot: imap(kman at ...)<20082><XOXiibOtpq2y2nhZ>: Panic: file mailbox-list-maildir-iter.c: line 511 (maildir_list_iter_next ): assertion failed: ((ctx->info.flags & MAILBOX_NOCHILDREN) != 0) Aug 25 16:18:27 kman dovecot: imap(kman at ...)<20082><XOXiibOtpq2y2nhZ>: Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0xdb62b) [0x7f659 9d9962b] -> /usr/lib/dovecot/libdovecot.so.0(+0xdb6c1) [0x7f6599d996c1] -> /usr/lib/dovecot/libdovecot.so.0(+0x4a149) [0x7f6599d08149] -> /usr/lib/dov ecot/libdovecot-storage.so.0(+0x45b6e) [0x7f6599e92b6e] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_list_index_sync+0x1dc) [0x7f6599f08c6c] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_list_index_refresh_force+0xfb) [0x7f6599f0ac3b] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xb9274 ) [0x7f6599f06274] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xb9467) [0x7f6599f06467] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_exists+0 x68) [0x7f6599ea70e8] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_list_mailbox+0x1f6) [0x7f6599eb6126] -> /usr/lib/dovecot/libdovecot-storage. so.0(mailbox_list_iter_init_namespaces+0x208) [0x7f6599f0be08] -> dovecot/imap(cmd_list_full+0x60e) [0x5654c07d02de] -> dovecot/imap(command_exec+0x70 ) [0x5654c07d9d80] -> dovecot/imap(+0x1e3f2) [0x5654c07d83f2] -> dovecot/imap(+0x1e494) [0x5654c07d8494] -> dovecot/imap(client_handle_input+0x1b5) [0 x5654c07d8845] -> dovecot/imap(client_input+0x7e) [0x5654c07d8d6e] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x6f) [0x7f6599dafadf] -> /usr/ lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x136) [0x7f6599db10d6] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c) [0x7f65 99dafb7c] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x40) [0x7f6599dafce0] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f659 9d300d3] -> dovecot/imap(main+0x325) [0x5654c07cabf5] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f6599b1b09b] -> dovecot/imap(_sta rt+0x2a) [0x5654c07cad8a] -- K -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200825/7c4713fd/attachment.html>