Hi I'm reposting this patch, which I have been applying locally since I originally posted it. Hopefully it can be considered for inclusion in the official release. It was tested on dovecot 2.3.16 but applies against the latest version 2.3.17.1. This is the "assertion failed" that it addresses doveadm fts lookup -u john@voipsupport.it body "text to look for" doveadm(john@voipsupport.it): Panic: file mail-storage.c: line 2108 (mailbox_get_open_status): assertion failed: (box->opened) doveadm(john@voipsupport.it): Error: Raw backtrace: /usr/local/lib/dovecot/libdovecot.so.0(backtrace_append+0x42) [0x7ff624fa7072] -> /usr/local/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e) [0x7ff624fa718e] -> /usr/local/lib/dovecot/libdovecot.so.0(+0xffc3b) [0x7ff624fb3c3b] -> /usr/local/lib/dovecot/libdovecot.so.0(+0xffc71) [0x7ff624fb3c71] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x5536f) [0x7ff624f0936f] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0x3fc31) [0x7ff6250bcc31] -> /usr/local/lib/dovecot/lib21_fts_solr_plugin.so(+0x540d) [0x7ff62244f40d] -> /usr/local/lib/dovecot/lib20_fts_plugin.so(fts_backend_lookup+0x4d) [0x7ff6246b624d] -> /usr/local/lib/dovecot/doveadm/lib20_doveadm_fts_plugin.so(+0x2e8c) [0x7ff62240ce8c] -> doveadm(+0x31ded) [0x55f0c7f3aded] -> doveadm(+0x32862) [0x55f0c7f3b862] -> doveadm(doveadm_cmd_ver2_to_mail_cmd_wrapper+0x22d) [0x55f0c7f3c6fd] -> doveadm(doveadm_cmd_run_ver2+0x4d8) [0x55f0c7f4d158] -> doveadm(doveadm_cmd_try_run_ver2+0x3a) [0x55f0c7f4d1aa] -> doveadm(main+0x1f6) [0x55f0c7f2b606] -> /lib64/libc.so.6(__libc_start_main+0xd5) [0x7ff624bc8b75] -> doveadm(_start+0x2e) [0x55f0c7f2ba0e] Aborted (core dumped) Here's the patch: diff -ur dovecot-2.3.17.1-orig/src/plugins/fts/doveadm-fts.c dovecot-2.3.17.1-new/src/plugins/fts/doveadm-fts.c --- dovecot-2.3.17.1-orig/src/plugins/fts/doveadm-fts.c 2021-12-03 12:48:47.000000000 +0100 +++ dovecot-2.3.17.1-new/src/plugins/fts/doveadm-fts.c 2022-01-09 01:33:23.396342025 +0100 @@ -47,6 +47,14 @@ i_array_init(&result.scores, 16); box = mailbox_alloc(info->ns->list, info->vname, 0); + mailbox_set_reason(box,"fts search"); + if (mailbox_open(box) < 0) { + i_error("Couldn't open mailbox: %s", + mailbox_get_last_internal_error(box, NULL)); + doveadm_mail_failed_error(ctx, MAIL_ERROR_TEMP); + return -1; + } + if (fts_backend_lookup(backend, box, ctx->search_args->args, FTS_LOOKUP_FLAG_AND_ARGS, &result) < 0) { i_error("fts lookup failed"); John