(gdb) bt full
#0  __restore_sigs (set=set@entry=0x7ffd7f9c2940) at ./arch/x86_64/syscall_arch.h:40
No locals.
#1  0x00007fb0889d20fb in raise (sig=sig@entry=6) at src/signal/raise.c:11
        set = {__bits = {0, 140396180477096, 145, 140396180498654, 140396178186776, 140726744394112, 2615157800, 0, 140396179935822, 4670227817392320798, 513, 513, 140396179935822, 140396180487243,
            140396179935822, 140396180476460}}
        ret = 0
#2  0x00007fb0889aa60e in abort () at src/exit/abort.c:14
No locals.
#3  0x00007fb0886e657b in ?? () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#4  0x00007fb088777601 in ?? () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#5  0x00007fb0886e621c in i_panic () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#6  0x00007fb08853f880 in ?? () from /usr/lib/dovecot/lib95_imap_sieve_plugin.so
No symbol table info available.
#7  0x00007fb08853fb3f in ?? () from /usr/lib/dovecot/lib95_imap_sieve_plugin.so
No symbol table info available.
#8  0x00007fb088668f48 in ?? () from /usr/lib/dovecot/lib20_zlib_plugin.so
No symbol table info available.
#9  0x00007fb088886087 in mailbox_save_alloc () from /usr/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#10 0x0000558d9a675a35 in ?? ()
No symbol table info available.
#11 0x0000558d9a682c90 in command_exec ()
No symbol table info available.
#12 0x0000558d9a681312 in ?? ()
No symbol table info available.
#13 0x0000558d9a6813ac in ?? ()
No symbol table info available.
#14 0x0000558d9a681765 in client_handle_input ()
No symbol table info available.
#15 0x0000558d9a681c7e in client_input ()
No symbol table info available.
#16 0x00007fb08878dc6f in io_loop_call_io () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#17 0x00007fb08878f2a6 in io_loop_handler_run_internal () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#18 0x00007fb08878dd0c in io_loop_handler_run () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#19 0x00007fb08878de70 in io_loop_run () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#20 0x00007fb08870e2f3 in master_service_run () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#21 0x0000558d9a673c44 in main ()
No symbol table info available.
(gdb)