I'm trying this:

doveadm import -u restore@backup.invalid mdbox:/home/copymail2/mdbox ""
mailbox INBOX header X-Spam Yes

nd I'm getting:

doveadm(restore@backup.invalid): Panic: file mail-index-util.c: line 10 (mail_index_uint32_to_offset): assertion failed: (offset < 0x40000000) doveadm(restore@backup.invalid): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x42) [0x7f598de6cac2] -> /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e) [0x7f598de6cbde] -> /usr/lib/dovecot/libdovecot.so.0(+0xe989e) [0x7f598de7789e] -> /usr/lib/dovecot/libdovecot.so.0(+0xe98e1) [0x7f598de778e1] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f598ddced04] -> /usr/lib/dovecot/libdovecot-storage.so.0(mail_index_uint32_to_offset+0x78) [0x7f598e227de8] -> /usr/lib/dovecot/libdovecot-storage.so.0(mail_cache_add+0x83b) [0x7f598e2103ab] -> /usr/lib/dovecot/libdovecot-storage.so.0(index_mail_parse_header+0x449) [0x7f598e1f2139] -> /usr/lib/dovecot/libdovecot.so.0(+0xc10a9) [0x7f598de4f0a9] -> /usr/lib/dovecot/libdovecot.so.0(i_stream_read_memarea+0x7a) [0x7f598de852ea] -> /usr/lib/dovecot/libdovecot.so.0(i_stream_read+0x2f) [0x7f598de8562f] -> /usr/lib/dovecot/libdovecot.so.0(i_stream_read_data+0x3d) [0x7f598de8600d] -> /usr/lib/dovecot/libdovecot.so.0(message_parse_header_next+0x68) [0x7f598de55a58] -> /usr/lib/dovecot/libdovecot.so.0(message_parse_header+0x52) [0x7f598de56432] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xcc561) [0x7f598e1fc561] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xcd85c) [0x7f598e1fd85c] -> /usr/lib/dovecot/libdovecot-storage.so.0(index_storage_search_next_nonblock+0x11d) [0x7f598e1fe04d] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_search_next_nonblock+0x28) [0x7f598e17df38] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_search_next+0x3d) [0x7f598e17df9d] -> doveadm(+0x31b13) [0x557f5d487b13] -> doveadm(+0x2c441) [0x557f5d482441] -> doveadm(+0x2d1c9) [0x557f5d4831c9] -> doveadm(doveadm_cmd_ver2_to_mail_cmd_wrapper+0x20e) [0x557f5d48409e] -> doveadm(doveadm_cmd_run_ver2+0x55e) [0x557f5d4953ee] -> doveadm(doveadm_cmd_try_run_ver2+0x37) [0x557f5d495447] -> doveadm(main+0x1d1) [0x557f5d472211] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f598d3cfb97] -> doveadm(_start+0x2a) [0x557f5d47272a] Aborted (core dumped)

I'm using ii dovecot-core 2:2.3.9.2-1+ubuntu18.04 amd64 secure POP3/IMAP server - core files ii dovecot-dbg 2:2.3.9.2-1+ubuntu18.04 amd64 secure POP3/IMAP server - debug symbols ii dovecot-imapd 2:2.3.9.2-1+ubuntu18.04 amd64 secure POP3/IMAP server - IMAP daemon ii dovecot-lmtpd 2:2.3.9.2-1+ubuntu18.04 amd64 secure POP3/IMAP server - LMTP server ii dovecot-lucene 2:2.3.9.2-1+ubuntu18.04 amd64 secure POP3/IMAP server - Lucene support Running in gdb results in this backtrace:

Program received signal SIGABRT, Aborted. __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 51../sysdeps/unix/sysv/linux/raise.c: No such file or directory. (gdb) bt #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 #1 0x00007ffff68e4801 in __GI_abort () at abort.c:79 #2 0x00007ffff736d851 in default_fatal_finish (status=0, type=LOG_TYPE_PANIC) at failures.c:459 #3 fatal_handler_real (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at failures.c:471 #4 0x00007ffff736d8e1 in default_fatal_handler (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at failures.c:479 #5 0x00007ffff72c4d04 in i_panic (format=format@entry=0x7ffff772dd00 "file %s: line %d (%s): assertion failed: (%s)") at failures.c:523 #6 0x00007ffff771dde8 in mail_index_uint32_to_offset (offset=<optimized out>) at mail-index-util.c:10 #7 0x00007ffff77063ab in mail_cache_header_fields_write (ctx=0x555555855330, buffer=<optimized out>, buffer=<optimized out>) at mail-cache-transaction.c:609 #8 mail_cache_header_add_field (field_idx=15, ctx=0x555555855330) at mail-cache-transaction.c:690 #9 mail_cache_add (ctx=0x555555855330, seq=1, field_idx=field_idx@entry=15, data=0x7ffff773b6d6, data_size=0) at mail-cache-transaction.c:739 #10 0x00007ffff76ea82c in index_mail_cache_add_idx (mail=mail@entry=0x555555869f18, field_idx=field_idx@entry=15, data=data@entry=0x7ffff773b6d6, data_size=data_size@entry=0) at index-mail.c:631 #11 0x00007ffff76e8139 in index_mail_parse_header_finish (mail=<optimized out>) at index-mail-headers.c:132 #12 index_mail_parse_header (part=<optimized out>, hdr=<optimized out>, mail=<optimized out>) at index-mail-headers.c:312 #13 0x00007ffff73450a9 in read_header (mstream=0x555555874740) at istream-header-filter.c:356 #14 i_stream_header_filter_read (stream=0x555555874740) at istream-header-filter.c:446 #15 0x00007ffff737b2ea in i_stream_read_memarea (stream=stream@entry=0x5555558747c0) at istream.c:313 #16 0x00007ffff737b62f in i_stream_read (stream=stream@entry=0x5555558747c0) at istream.c:271 #17 0x00007ffff737c00d in i_stream_read_data (stream=0x5555558747c0, data_r=data_r@entry=0x7fffffffdc08, size_r=size_r@entry=0x7fffffffdc10, threshold=threshold@entry=1) at istream.c:745 #18 0x00007ffff734ba58 in i_stream_read_bytes (wanted=2, size_r=0x7fffffffdc10, data_r=0x7fffffffdc08, stream=<optimized out>) at ../../src/lib/istream.h:217 #19 message_parse_header_next (ctx=0x555555869db0, hdr_r=hdr_r@entry=0x7fffffffdc70) at message-header-parser.c:85 #20 0x00007ffff734c432 in message_parse_header (input=<optimized out>, hdr_size=hdr_size@entry=0x0, flags=flags@entry=MESSAGE_HEADER_PARSER_FLAG_CLEAN_ONELINE, callback=callback@entry=0x7ffff76f1aa0 , context=context@entry=0x7fffffffdce0) at message-header-parser.c:392 #21 0x00007ffff76f2561 in search_arg_match_text (ctx=0x555555856fa0, args=0x5555558216d0) at index-search.c:759 #22 search_match_once (ctx=0x555555856fa0) at index-search.c:1399 #23 0x00007ffff76f385c in search_match_next (ctx=0x555555856fa0) at index-search.c:1506 #24 search_more_with_mail (mail=<optimized out>, ctx=0x555555856fa0) at index-search.c:1623 #25 search_more_with_prefetching (mail_r=<optimized out>, ctx=<optimized out>) at index-search.c:1705 #26 search_more (ctx=ctx@entry=0x555555856fa0, mail_r=mail_r@entry=0x7fffffffde10) at index-search.c:1779 #27 0x00007ffff76f404d in index_storage_search_next_nonblock (_ctx=0x555555856fa0, mail_r=0x7fffffffdee0, tryagain_r=0x7fffffffde77) at index-search.c:1807 #28 0x00007ffff7673f38 in mailbox_search_next_nonblock (ctx=0x555555856fa0, mail_r=0x7fffffffdee0, tryagain_r=<optimized out>) at mail-storage.c:2307 #29 0x00007ffff7673f9d in mailbox_search_next (ctx=0x555555856fa0, mail_r=mail_r@entry=0x7fffffffdee0) at mail-storage.c:2292 #30 0x0000555555586d52 in doveadm_mail_iter_next (iter=<optimized out>, mail_r=mail_r@entry=0x7fffffffdee0) at doveadm-mail-iter.c:160 #31 0x0000555555585b13 in cmd_import_box (search_args=<optimized out>, info=0x55555584e7b8, dest_user=<optimized out>, ctx=0x55555581fdb8) at doveadm-mail-import.c:142 #32 cmd_import_run (_ctx=0x55555581fdb8, user=0x5555558374b8) at doveadm-mail-import.c:202 #33 0x0000555555580441 in doveadm_mail_next_user (ctx=ctx@entry=0x55555581fdb8, error_r=error_r@entry=0x7fffffffe0c0) at doveadm-mail.c:462 #34 0x00005555555810db in doveadm_mail_single_user (ctx=ctx@entry=0x55555581fdb8, error_r=error_r@entry=0x7fffffffe0c0) at doveadm-mail.c:492 #35 0x00005555555811c9 in doveadm_mail_cmd_exec (ctx=ctx@entry=0x55555581fdb8, wildcard_user=wildcard_user@entry=0x0) at doveadm-mail.c:653 #36 0x000055555558209e in doveadm_cmd_ver2_to_mail_cmd_wrapper (cctx=<optimized out>) at doveadm-mail.c:1144 #37 0x00005555555933ee in doveadm_cmd_run_ver2 (argc=10, argv=0x5555557f6bb8, cctx=cctx@entry=0x7fffffffe2b0) at doveadm-cmd.c:575 #38 0x0000555555593447 in doveadm_cmd_try_run_ver2 (cmd_name=<optimized out>, argc=<optimized out>, argv=<optimized out>, cctx=0x7fffffffe2b0) at doveadm-cmd.c:497 #39 0x0000555555570211 in main (argc=<optimized out>, argv=<optimized out>) at doveadm.c:395 (gdb)

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