[Bug 282733] [NEW] Winbind deamon segfaults regularly

[Jelmer Jaarsma]

Public bug reported:

Binary package hint: samba

I upgraded a Hardy installation to Intrepid, and I wanted to test Samba + Winbind authentication.
I configured Samba, started the deamons, joined the domain and everything was working. wbinfo and getent show the proper information, however, roughly every 10 minutes winbindd will crash and will result in the trace listed at the bottom of this message. Winbind will keep on crashing until I run a "getent passwd" in a terminal, that somehow seems to fix it temporarily.
Our domain controllers run Windows Server 2008 but the domain is still on 2003-mode. The schema has been extended with Microsoft's rfc2307 scheme and Winbind has been configured to use it.

It is possible that this bug has been fixed in Samba 3.2.4, the release
notes mention "Fix Winbind crash."

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The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for PID 13577 (/usr/sbin/winbindd).

This means there was a problem with the program, such as a segfault.
Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occurred.  The Samba log
files may contain additional information about the problem.

If the problem persists, you are encouraged to first install the
samba-dbg package, which contains the debugging symbols for the Samba
binaries.  Then submit the provided information as a bug report to
Ubuntu by visiting this link:
https://launchpad.net/ubuntu/+source/samba/+filebug

[Thread debugging using libthread_db enabled]
[New Thread 0xb7784930 (LWP 13577)]
0xb7c49430 in __kernel_vsyscall ()
#0  0xb7c49430 in __kernel_vsyscall ()
#1  0xb79945e3 in waitpid () from /lib/tls/i686/cmov/libc.so.6
#2  0xb793175b in ?? () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7d3a7c1 in smb_panic () from /usr/sbin/winbindd
#4  0xb7d27dd3 in sig_fault () from /usr/sbin/winbindd
#5  <signal handler called>
#6  0xb7e7a9aa in ads_pull_string () from /usr/sbin/winbindd
#7  0xb7528884 in ?? () from /usr/lib/samba/nss_info/rfc2307.so
#8  0xb7ea0182 in nss_get_info () from /usr/sbin/winbindd
#9  0xb7cad30c in nss_get_info_cached () from /usr/sbin/winbindd
#10 0xb7cc4080 in query_user () from /usr/sbin/winbindd
#11 0xb7cab77d in query_user () from /usr/sbin/winbindd
#12 0xb7c9c5df in winbindd_dual_userinfo () from /usr/sbin/winbindd
#13 0xb7cc9247 in fork_domain_child () from /usr/sbin/winbindd
#14 0xb7cc942d in schedule_async_request () from /usr/sbin/winbindd
#15 0xb7cc9db5 in async_request () from /usr/sbin/winbindd
#16 0xb7cc9f50 in async_domain_request () from /usr/sbin/winbindd
#17 0xb7ccbfda in do_async_domain () from /usr/sbin/winbindd
#18 0xb7ccc49e in query_user_async () from /usr/sbin/winbindd
#19 0xb7c9b576 in winbindd_getpwsid () from /usr/sbin/winbindd
#20 0xb7c9b6bc in getpwuid_recv () from /usr/sbin/winbindd
#21 0xb7cd0f89 in winbindd_uid2sid_recv () from /usr/sbin/winbindd
#22 0xb7cca460 in do_async_recv () from /usr/sbin/winbindd
#23 0xb7cc9b6a in async_reply_recv () from /usr/sbin/winbindd
#24 0xb7c98ac3 in rw_callback () from /usr/sbin/winbindd
#25 0xb7c99b31 in main () from /usr/sbin/winbindd
The program is running.  Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]
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** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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Winbind deamon segfaults regularly
https://bugs.launchpad.net/bugs/282733
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