[Bug 921547] [NEW] Segmentation fault in libkrb5.so.25

Wed Jan 25 12:53:45 UTC 2012

Public bug reported:

While trying to reproduce Ubuntu Bug #921489 I can repeatedly generate a
Segmentation Fault in another code path.

The test I setup was one single client doing repeated searches against
slapd using GSSAPI auth

while true; do ldapsearch -Y GSSAPI -H ldap://server.example.com
uid=user > /dev/null ; if [ $? -ne 0 ]; then sleep 2; fi ; done

Using 15 of thease loops the server crashes within 30 minutes.

syslog:
kernel: [  762.119437] slapd[1422] general protection ip:7fd4beda9a52 sp:7fd3a2ffb5c0 error:0 in libkrb5.so.25.0.0[7fd4bed67000+cd000]

gdb: (The missing symbols is due to CRC mismatches in debug packages
reported in #921499 and #921505).

Core was generated by usr/sbin/slapd -d 0 -h ldap:/// ldaps:/// -f /local/sukat/conf/slapd.conf'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fd4beda9a52 in ?? () from /usr/lib/libkrb5.so.25
(gdb) bt
#0  0x00007fd4beda9a52 in ?? () from /usr/lib/libkrb5.so.25
#1  0x00007fd4beda9c69 in ?? () from /usr/lib/libkrb5.so.25
#2  0x00007fd4bedaa2c9 in ?? () from /usr/lib/libkrb5.so.25
#3  0x00007fd4bedbb9e8 in krb5_sendto () from /usr/lib/libkrb5.so.25
#4  0x00007fd4bedbbf1c in krb5_sendto_context () from /usr/lib/libkrb5.so.25
#5  0x00007fd4bedbc111 in krb5_sendto_kdc_flags () from /usr/lib/libkrb5.so.25
#6  0x00007fd4bed9f5b2 in krb5_get_in_cred () from /usr/lib/libkrb5.so.25
#7  0x00007fd4beda15c3 in krb5_get_init_creds_keytab () from /usr/lib/libkrb5.so.25
#8  0x00007fd4bf058c3e in ?? () from /usr/lib/libgssapi.so.2
#9  0x00007fd4bf05665d in ?? () from /usr/lib/libgssapi.so.2
#10 0x00007fd4bf050e63 in gss_acquire_cred () from /usr/lib/libgssapi.so.2
#11 0x00007fd4bf05c017 in ?? () from /usr/lib/libgssapi.so.2
#12 0x00007fd4bf050e63 in gss_acquire_cred () from /usr/lib/libgssapi.so.2
#13 0x00007fd4bf26c9f9 in ?? () from /usr/lib/sasl2/libgssapiv2.so.2
#14 0x00007fd4c36526f1 in sasl_server_step (conn=0x7fd37f448f70, clientin=<value optimised out>, clientinlen=<value optimised out>, 
    serverout=0x7fd3a2ffc7c8, serveroutlen=<value optimised out>) at server.c:1433
#15 0x00007fd4c36538c4 in sasl_server_start (conn=0x7fd37f448f70, mech=<value optimised out>, 
    clientin=0x7fd397d44abc "202\002\204\006\t*\206H\206\367\022\001\002\002\001", clientinlen=648, serverout=0x7fd3a2ffc7c8, serveroutlen=0x66666667)
    at server.c:1353
#16 0x00007fd4c47400e7 in slap_sasl_bind ()
#17 0x00007fd4c470b0c0 in fe_op_bind ()
#18 0x00007fd4c470b9ef in do_bind ()
#19 0x00007fd4c46ec91f in ?? ()
#20 0x00007fd4c46ed27d in ?? ()
#21 0x00007fd4c424e2d8 in ?? () from /usr/lib/libldap_r-2.4.so.2
#22 0x00007fd4c26ef9ca in start_thread () from /lib/libpthread.so.0
#23 0x00007fd4c244c70d in clone () from /lib/libc.so.6
#24 0x0000000000000000 in ?? ()

ProblemType: Bug 
Architecture: amd64
Date: Wed Jan 25 12:07:24 2012
Dependencies:
 adduser 3.112ubuntu1
 base-files 5.0.0ubuntu20.10.04.4
 base-passwd 3.5.22
 coreutils 7.4-2ubuntu3
 debconf 1.5.28ubuntu4
 debconf-i18n 1.5.28ubuntu4
 debianutils 3.2.2
 dpkg 1.15.5.6ubuntu4.5 [modified: sbin/start-stop-daemon]
 findutils 4.4.2-1ubuntu1
 gcc-4.4-base 4.4.3-4ubuntu5
 libacl1 2.2.49-2
 libattr1 1:2.4.44-1
 libbz2-1.0 1.0.5-4ubuntu0.2
 libc-bin 2.11.1-0ubuntu7.8
 libc6 2.11.1-0ubuntu7.8
 libcomerr2 1.41.11-1ubuntu2.1
 libdb4.7 4.7.25-9
 libdb4.8 4.8.24-1ubuntu1
 libgcc1 1:4.4.3-4ubuntu5
 libgcrypt11 1.4.4-5ubuntu2
 libgdbm3 1.8.3-9
 libgnutls26 2.8.5-2
 libgpg-error0 1.6-1ubuntu2
 libgssapi-krb5-2 1.8.1+dfsg-2ubuntu0.10
 libk5crypto3 1.8.1+dfsg-2ubuntu0.10
 libkeyutils1 1.2-12
 libkrb5-3 1.8.1+dfsg-2ubuntu0.10
 libkrb5support0 1.8.1+dfsg-2ubuntu0.10
 libldap-2.4-2 2.4.21-0ubuntu5.6
 liblocale-gettext-perl 1.05-6
 libltdl7 2.2.6b-2ubuntu1
 libncurses5 5.7+20090803-2ubuntu3
 libpam-modules 1.1.1-2ubuntu5.4
 libpam0g 1.1.1-2ubuntu5.4
 libperl5.10 5.10.1-8ubuntu2.1
 libreadline6 6.1-1
 libsasl2-2 2.1.23.dfsg1-5ubuntu1
 libselinux1 2.0.89-4
 libslp1 1.2.1-7.6ubuntu0.1
 libstdc++6 4.4.3-4ubuntu5
 libtasn1-3 2.4-1
 libtext-charwidth-perl 0.04-6
 libtext-iconv-perl 1.7-2
 libtext-wrapi18n-perl 0.06-7
 libwrap0 7.6.q-18
 lzma 4.43-14ubuntu2
 odbcinst 2.2.11-21
 odbcinst1debian1 2.2.11-21
 passwd 1:4.1.4.2-1ubuntu2.2
 perl 5.10.1-8ubuntu2.1
 perl-base 5.10.1-8ubuntu2.1
 perl-modules 5.10.1-8ubuntu2.1
 psmisc 22.10-1
 readline-common 6.1-1
 sensible-utils 0.0.1ubuntu3
 tzdata 2011n-0ubuntu0.10.04
 unixodbc 2.2.11-21
 zlib1g 1:1.2.3.3.dfsg-15ubuntu1
DistroRelease: Ubuntu 10.04
NonfreeKernelModules: openafs
Package: slapd 2.4.21-0ubuntu5.6
PackageArchitecture: amd64
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 LC_CTYPE=en_GB.UTF-8
ProcVersionSignature: Ubuntu 2.6.32-37.81-generic 2.6.32.49+drm33.21
SourcePackage: openldap
Tags: lucid
Uname: Linux 2.6.32-37-generic x86_64

** Affects: openldap (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/921547

Title:
  Segmentation fault in libkrb5.so.25

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