Hi Aki, Thanks for your response. Indeed, I don't know why the first 2 lines don't have debugging symbols, as my build of dovecot definitely has them. Any hints on how I can get them?
$ file /usr/local/libexec/dovecot/auth /usr/local/libexec/dovecot/auth: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically linked, interpreter /libexec/ld-elf.so.1, for FreeBSD 12.0 (1200054), FreeBSD-style, with debug_info, not stripped Regardless, it is not really necessary, as I was able to determine from /var/log/debug.log and aslo by attaching gdb to the running "auth -w" process that this all occurred during the pam_authenticate step in src/auth/passdb-pam.c (as per my DIAGNOSIS section in the previous email): https://github.com/dovecot/core/blob/188.8.131.52/src/auth/passdb-pam.c#L158 Regards, Ben -- From: Benjamin Woods woods...@gmail.com On 13 February 2018 at 00:44, Aki Tuomi <aki.tu...@dovecot.fi> wrote: > Hi! > > Can you attempt to get core dump with debugging symbols with dovecot too? > Currently it seems to only contain symbols from kerberos bit, which is not > very useful on it's own. > > Aki > > > On 12 February 2018 at 17:34 Ben Woods <woods...@gmail.com> wrote: > > GDB BACKTRACE OF COREDUMP: > > $ gdb /usr/local/libexec/dovecot/auth > > GNU gdb (GDB) 8.0.1 [GDB v8.0.1 for FreeBSD] > > Copyright (C) 2017 Free Software Foundation, Inc. > > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl. > html > > > > > This is free software: you are free to change and redistribute it. > > There is NO WARRANTY, to the extent permitted by law. Type "show > copying" > > and "show warranty" for details. > > This GDB was configured as "x86_64-portbld-freebsd12.0". > > Type "show configuration" for configuration details. > > For bug reporting instructions, please see: > > <http://www.gnu.org/software/gdb/bugs/>. > > Find the GDB manual and other documentation resources online at: > > <http://www.gnu.org/software/gdb/documentation/>. > > For help, type "help". > > Type "apropos word" to search for commands related to "word"... > > Reading symbols from /usr/local/libexec/dovecot/auth...done. > > (gdb) core /tmp/auth.core > > [New LWP 102627] > > warning: Can't read pathname for load map: Unknown error: -1. > > warning: Can't read pathname for load map: Unknown error: -1. > > warning: Can't read pathname for load map: Unknown error: -1. > > warning: Can't read pathname for load map: Unknown error: -1. > > Core was generated by `dovecot/auth -w'. > > Program terminated with signal SIGSEGV, Segmentation fault. > > #0 strlen (str=0x0) at /usr/src/lib/libc/string/strlen.c:100 > > warning: Source file is more recent than executable. > > 100 */ > > (gdb) bt > > #0 strlen (str=0x0) at /usr/src/lib/libc/string/strlen.c:100 > > #1 0x0000000012130022 in strdup (str=0x0) at > > /usr/src/lib/libc/string/strdup.c:46 > > #2 0x0000000011b65e9d in krb5_appdefault_string (context=0x10777000, > > appname=0x106f0018 "imap", realm=0x0, option=0x13b1f403 > "ticket_lifetime", > > default_value=0x0, ret_value=0x7fffffffe088) > > at appdefault.c:165 > > #3 0x0000000013af4a80 in krb5_appdefault_time (context=0x0, > > appname=0xffffffffaaca6003 <error: Cannot access memory at address > > 0xffffffffaaca6003>, > > realm=0x50 <error: Cannot access memory at address 0x50>, option=0x0, > > def_val=0, ret_val=0x7fffffffe0e0) at > > /usr/src/crypto/heimdal/lib/krb5/appdefault.c:130 > > #4 0x0000000013ae3e79 in krb5_get_init_creds_opt_set_default_flags > > (context=0x10777000, appname=0x106f0018 "imap", realm=0x0, > opt=0x1070f3c0) > > at /usr/src/crypto/heimdal/lib/krb5/init_creds.c:171 > > #5 0x00000000138b738f in ?? () > > #6 0x0000000000000000 in ?? () > > >