[Pkg-samba-maint] Bug#707042: Samba segfault every 30-90 seconds

[Steve M. Robbins]

Package: samba
Version: 2:3.6.14-1
Severity: important

Updated my sid box on Sunday after the post-release floodgates opened
and Samba started segfaulting extremely frequently, and emailing me
every time.  I installed the samba-dbg package; below is the stack
trace from the emails.  I did check the log files as advised by the
email, but nothing jumped out as relevant.

I chose 'important' because it seems that samba is completely
broken by this.  My windows machine can't connect to the shares.

Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007ffd04ed07be in __libc_waitpid (pid=<optimized out>, stat_loc=0x7fff10de959c, options=<optimized out>) at ../sysdeps/unix/sysv/linux/waitpid.c:32
#0  0x00007ffd04ed07be in __libc_waitpid (pid=<optimized out>, stat_loc=0x7fff10de959c, options=<optimized out>) at ../sysdeps/unix/sysv/linux/waitpid.c:32
#1  0x00007ffd04e64c99 in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:149
#2  0x00007ffd07bff069 in smb_panic (why=why at entry=0x7ffd07fc034e "internal error") at lib/util.c:1123
#3  0x00007ffd07bf0224 in fault_report (sig=<optimized out>) at lib/fault.c:53
#4  sig_fault (sig=<optimized out>) at lib/fault.c:76
#5  <signal handler called>
#6  wcache_save_sid_to_name (domain=domain at entry=0x7ffd098c0740, status=..., sid=sid at entry=0x7fff10de9c70, domain_name=0x0, name=0x0, type=SID_NAME_UNKNOWN) at winbindd/winbindd_cache.c:977
#7  0x00007ffd07b2c805 in rids_to_names (domain=domain at entry=0x7ffd098c0740, mem_ctx=0x7ffd098d2630, domain_sid=domain_sid at entry=0x7ffd098cbfd0, rids=rids at entry=0x7ffd098cc110, num_rids=num_rids at entry=1, domain_name=domain_name at entry=0x7fff10de9de8, names=names at entry=0x7fff10de9df0, types=types at entry=0x7fff10de9df8) at winbindd/winbindd_cache.c:2213
#8  0x00007ffd07b4d399 in _wbint_LookupRids (p=p at entry=0x7fff10de9e80, r=r at entry=0x7ffd098d26a0) at winbindd/winbindd_dual_srv.c:550
#9  0x00007ffd07b5623e in api_wbint_LookupRids (p=0x7fff10de9e80) at librpc/gen_ndr/srv_wbint.c:1597
#10 0x00007ffd07b4c2bd in winbindd_dual_ndrcmd (domain=<optimized out>, state=0x7fff10dea050) at winbindd/winbindd_dual_ndr.c:322
#11 0x00007ffd07b4b014 in child_process_request (state=0x7fff10dea050, child=<optimized out>) at winbindd/winbindd_dual.c:440
#12 fork_domain_child (child=0x7ffd098c0150) at winbindd/winbindd_dual.c:1554
#13 0x00007ffd07b4baa5 in wb_child_request_trigger (req=0x7ffd098be6b0, private_data=<optimized out>) at winbindd/winbindd_dual.c:145
#14 0x00007ffd07c10632 in tevent_common_loop_immediate (ev=ev at entry=0x7ffd098b7c10) at ../lib/tevent/tevent_immediate.c:135
#15 0x00007ffd07c0e737 in run_events_poll (ev=0x7ffd098b7c10, pollrtn=0, pfds=0x0, num_pfds=0) at lib/events.c:198
#16 0x00007ffd07c0eb56 in s3_event_loop_once (ev=0x7ffd098b7c10, location=<optimized out>) at lib/events.c:331
#17 0x00007ffd07c0f740 in _tevent_loop_once (ev=0x7ffd098b7c10, location=location at entry=0x7ffd07f701b8 "winbindd/winbindd.c:1456") at ../lib/tevent/tevent.c:494
#18 0x00007ffd07b21c4b in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at winbindd/winbindd.c:1456
A debugging session is active.




-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.8-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages samba depends on:
ii  adduser                 3.113+nmu3
ii  cdebconf [debconf-2.0]  0.182
ii  debconf [debconf-2.0]   1.5.50
ii  dpkg                    1.16.10
ii  libacl1                 2.2.51-8
ii  libattr1                1:2.4.46-8
ii  libc6                   2.13-38
ii  libcap2                 1:2.22-1.2
ii  libcomerr2              1.42.5-1.1
ii  libcups2                1.5.3-5
ii  libgssapi-krb5-2        1.10.1+dfsg-5
ii  libk5crypto3            1.10.1+dfsg-5
ii  libkrb5-3               1.10.1+dfsg-5
ii  libldap-2.4-2           2.4.31-1+nmu2
ii  libpam-modules          1.1.3-9
ii  libpam-runtime          1.1.3-9
ii  libpam0g                1.1.3-9
ii  libpopt0                1.16-7
ii  libtalloc2              2.0.8-0.1
ii  libtdb1                 1.2.10-2
ii  libwbclient0            2:3.6.14-1
ii  lsb-base                4.1+Debian9
ii  procps                  1:3.3.6-1
ii  samba-common            2:3.6.14-1
ii  update-inetd            4.43
ii  zlib1g                  1:1.2.7.dfsg-13

Versions of packages samba recommends:
ii  logrotate  3.8.3-5
pn  tdb-tools  <none>

Versions of packages samba suggests:
pn  ctdb                              <none>
pn  ldb-tools                         <none>
ii  openbsd-inetd [inet-superserver]  0.20091229-2
pn  smbldap-tools                     <none>
ii  winbind                           2:3.6.14-1

-- debconf information:
  samba/generate_smbpasswd: true
* samba/run_mode: daemons
  samba-common/title: