[hybrid] [devel at sumpfralle.de: Bug#932774: ircd-hybrid: Segfault in libgmp.so.10.3.2]

[Dominic Hargreaves]

Hello,

Does this ring a bell with anyone? Afraid I won't be able to dig
into this for a few days.

Thanks,
Dominic.

----- Forwarded message from devel at sumpfralle.de -----

Date: Tue, 23 Jul 2019 01:16:09 +0200
From: devel at sumpfralle.de
To: submit at bugs.debian.org
Subject: Bug#932774: ircd-hybrid: Segfault in libgmp.so.10.3.2
Reply-To: devel at sumpfralle.de, 932774 at bugs.debian.org

Source: ircd-hybrid
Version: 1:8.2.24+dfsg.1-1
Severity: normal

Dear Maintainer,

after upgrading a host from Stretch to Buster, ircd-hybrid fails to
start:

  irc at example:~$ ircd-hybrid -foreground
  ircd: version hybrid-1:8.2.24+dfsg.1-1(20180404_8492)
  ircd: pid 32127
  ircd: running in foreground mode from /usr
  Segmentation fault


gdb shows the following output:

  irc at example:~$ gdb --args ircd-hybrid -foreground
  GNU gdb (Debian 8.2.1-2) 8.2.1
  Copyright (C) 2018 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-linux-gnu".
  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 ircd-hybrid...(no debugging symbols found)...done.
  (gdb) run
  Starting program: /usr/sbin/ircd-hybrid -foreground
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  ircd: version hybrid-1:8.2.24+dfsg.1-1(20180404_8492)
  ircd: pid 28120
  ircd: running in foreground mode from /usr

  Program received signal SIGSEGV, Segmentation fault.
  0x00007ffff765a5f0 in __gmpz_sizeinbase () from /usr/lib/x86_64-linux-gnu/libgmp.so.10
  (gdb) bt
  #0  0x00007ffff765a5f0 in __gmpz_sizeinbase () from /usr/lib/x86_64-linux-gnu/libgmp.so.10
  #1  0x00007ffff7f3acce in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.30
  #2  0x00007ffff7e6e1b4 in gnutls_certificate_set_dh_params () from /usr/lib/x86_64-linux-gnu/libgnutls.so.30
  #3  0x00005555555778f3 in tls_new_cred ()
  #4  0x0000555555566bfd in read_conf_files ()
  #5  0x000055555555efc4 in main ()


ltrace shows the following at the end of its run:

  calloc(1, 32)                                                                                     = 0x558d1fc9f3a0
  gnutls_global_init(0, 1265, 40, 0)                                                                = 0
  gnutls_certificate_allocate_credentials(0x558d1fc9f3a0, 0, 0x7f3c4f66a620, 0)                     = 0
  gnutls_priority_init(0x558d1fc9f3a8, 0x558d1dbc7748, 0, 0x558d1fca8a00)                           = 0
  gnutls_certificate_set_x509_key_file(0x558d1fc9f3d0, 0x558d1fca0490, 0x558d1fca0450, 1)           = 0
  gnutls_dh_params_init(0x558d1fc9f3b0, 0, 0, 0)                                                    = 0
  gnutls_certificate_set_dh_params(0x558d1fc9f3d0, 0x558d1fc897c0, 24, 0 <no return ...>
  --- SIGSEGV (Segmentation fault) ---
  +++ killed by SIGSEGV +++


The kernel log contains the following:

  ircd-hybrid[32122]: segfault at 4 ip 00007f5548d1b5f0 sp 00007ffc4241e6a8 error 4 in libgmp.so.10.3.2[7f5548d02000+5e000]


I took a quick look at "gnutls_certificate_set_dh_params".  Its manpage
[1] describes this function as deprecated for quite some time.  I do not
know, whether this is relevant.

Thank you for your time!

Cheers,
Lars


[1] https://manpages.debian.org/buster/gnutls-doc/gnutls_certificate_set_dh_params.3.en.html


----- End forwarded message -----