gdb backtrace

bt.txt

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007f3854f3a5b9 in __GI_abort () at abort.c:79
#2  0x00007f385531272b in default_fatal_finish (type=LOG_TYPE_PANIC, status=0) at failures.c:201
#3  0x00007f385538049a in default_fatal_handler (ctx=0x7fff4ad07de0, format=<optimized out>, args=<optimized out>)
    at failures.c:215
#4  0x00007f385531241a in i_panic (format=format@entry=0x7f3855715000 "file %s: line %d (%s): assertion failed: (%s)")
    at failures.c:275
#5  0x00007f3855659ce6 in imapc_client_run_pre (client=<optimized out>, client=<optimized out>) at imapc-client.c:179
#6  imapc_client_run (client=<optimized out>) at imapc-client.c:210
#7  0x00007f38556b709c in imapc_simple_run (sctx=sctx@entry=0x7fff4ad07f60) at imapc-storage.c:127
#8  0x00007f38556af97a in imapc_list_refresh () at imapc-list.c:573
#9  0x00007f38556b0110 in imapc_list_get_mailbox_flags () at imapc-list.c:936
#10 0x00007f38556b39c9 in imapc_mailbox_fetch_state (mbox=0x5580d501a168, first_uid=134695) at imapc-mailbox.c:250
#11 0x00007f38556b3ac6 in imapc_untagged_exists (reply=<optimized out>, mbox=0x5580d501a168) at imapc-mailbox.c:302
#12 0x00007f38556b6511 in imapc_storage_client_untagged_cb (reply=0x7fff4ad08080, context=0x5580d4f03610)
    at imapc-storage.c:204
#13 0x00007f38556bc9bb in imapc_connection_input_untagged (conn=conn@entry=0x5580d4f30bc0) at imapc-connection.c:1263
#14 0x00007f38556bec99 in imapc_connection_input_one (conn=0x5580d4f30bc0) at imapc-connection.c:1531
#15 imapc_connection_input_pending (conn=0x5580d4f30bc0) at imapc-connection.c:1927
#16 0x00007f38556becea in imapc_connection_input () at imapc-connection.c:1571
#17 0x00007f385539479a in io_loop_call_io () at ioloop.c:600
#18 0x00007f3855395c06 in io_loop_handler_run_internal () at ioloop-epoll.c:223
#19 0x00007f385539480a in io_loop_handler_run () at ioloop.c:649
#20 0x00007f3855394968 in io_loop_run () at ioloop.c:624
#21 0x00007f38556b9e4c in imapc_client_run_pre (client=0x5580d4f0e2a8, client=0x5580d4f0e2a8) at imapc-client.c:191
#22 imapc_client_run () at imapc-client.c:210
#23 0x00007f38556b6fa0 in imapc_mailbox_run_nofetch (mbox=0x5580d501a168) at imapc-storage.c:139
#24 0x00007f38556b1195 in imapc_mail_fetch () at imapc-mail-fetch.c:491
#25 0x00007f38556b28c5 in imapc_mail_get_stream () at imapc-mail.c:318
#26 0x00007f385566247f in mail_get_stream_because (mail=mail@entry=0x5580d505a198, hdr_size=hdr_size@entry=0x0, 
    body_size=body_size@entry=0x0, reason=reason@entry=0x7f3855719662 "access", stream_r=stream_r@entry=0x7fff4ad08350)
    at mail.c:276
#27 0x00007f38556daf32 in index_mail_update_access_parts_post (_mail=0x5580d505a198) at index-mail.c:1907
#28 0x00007f38556e1af0 in search_more_with_prefetching (mail_r=<optimized out>, ctx=<optimized out>) at index-search.c:1749
#29 search_more () at index-search.c:1780
#30 0x00007f38556e1d25 in index_storage_search_next_nonblock () at index-search.c:1808
#31 0x00007f385566eb06 in mailbox_search_next_nonblock (ctx=0x5580d50ce2f0, mail_r=0x7fff4ad084a8, 
    tryagain_r=<optimized out>) at mail-storage.c:2056
#32 0x00007f385566eb85 in mailbox_search_next (ctx=0x5580d50ce2f0, mail_r=mail_r@entry=0x7fff4ad084a8) at mail-storage.c:2042
#33 0x00005580d499a23b in dsync_mailbox_export_next_mail () at dsync-mailbox-export.c:884
#34 0x00005580d4992cb5 in dsync_brain_send_mail (brain=0x5580d500eac8) at dsync-brain-mails.c:331
#35 dsync_brain_sync_mails () at dsync-brain-mails.c:424
#36 0x00005580d498e8e8 in dsync_brain_run_real (changed_r=0x7fff4ad0865a, brain=0x5580d500eac8) at dsync-brain.c:711
#37 dsync_brain_run () at dsync-brain.c:744
#38 0x00005580d4976544 in cmd_dsync_run_local (mail_error_r=0x7fff4ad0865c, changes_during_sync_r=<synthetic pointer>, 
    ibc2=<optimized out>, brain=0x5580d4efd038, user=<optimized out>, ctx=0x5580d4ee4b28) at doveadm-dsync.c:419
#39 cmd_dsync_run () at doveadm-dsync.c:671
#40 0x00005580d4978104 in doveadm_mail_next_user () at doveadm-mail.c:429
#41 0x00005580d4978c17 in doveadm_mail_single_user () at doveadm-mail.c:460
#42 0x00005580d4978ccd in doveadm_mail_cmd_exec () at doveadm-mail.c:621
#43 0x00005580d497957f in doveadm_mail_cmd (argv=<optimized out>, argc=9, cmd=0x5580d4ee5348) at doveadm-mail.c:718
#44 doveadm_mail_try_run () at doveadm-mail.c:791
#45 0x00005580d4969c7a in main () at doveadm.c:401
#46 0x00007f3854f3c11b in __libc_start_main (main=0x5580d49697a0 <main>, argc=13, argv=0x7fff4ad08b58, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff4ad08b48) at ../csu/libc-start.c:308
#47 0x00005580d4969dba in _start ()