[Samba] Run away samba, and free() errors

Terry Hardie terryh at orcas.net
Sun Apr 9 16:54:44 GMT 2006 

On Sun, 9 Apr 2006, Terry Hardie wrote:

> > Ok, seems ok as far as I know. If this is reproducible
> > for you you might want to try setting MALLOC_CHECK_=2
> > before running smbd, or if you can reproduce it with
> > one client use valgrind.
>
> This is what I get:
>
> /etc/samba/gdbcommands:1: Error in sourced command file:
> Previous frame inner to this frame (corrupt stack?)
> [2006/04/09 09:37:06, 0] lib/util.c:smb_panic2(1493)
>   smb_panic(): action returned status 0
> [2006/04/09 09:37:06, 0] lib/util.c:smb_panic2(1495)
>   PANIC: internal error
> [2006/04/09 09:37:06, 0] lib/util.c:smb_panic2(1503)
>   BACKTRACE: 17 stack frames:
>    #0 smbd(smb_panic2+0x111) [0x81e3b31]
>    #1 smbd(smb_panic+0x1a) [0x81e3a1a]
>    #2 smbd [0x81d0e58]
>    #3 [0xffffe420]
>    #4 /lib/tls/libc.so.6(abort+0xeb) [0xb7d4506b]
>    #5 /lib/tls/libc.so.6 [0xb7d81185]
>    #6 /lib/tls/libc.so.6(__libc_free+0x35) [0xb7d80fc5]
>    #7 /lib/libcom_err.so.2(remove_error_table+0x5a) [0xb7ed9d8e]
>    #8 /usr/lib/libkrb5.so.3 [0xb7f0f8ef]
>    #9 /usr/lib/libkrb5.so.3 [0xb7f0f4fb]
>    #10 /usr/lib/libkrb5.so.3 [0xb7f6db9a]
>    #11 /lib/ld-linux.so.2 [0xb7fea2de]
>    #12 /lib/tls/libc.so.6(exit+0xc4) [0xb7d46494]
>    #13 smbd(exit_server+0x16b) [0x8259bdb]
>    #14 smbd(main+0x51f) [0x825a1ff]
>    #15 /lib/tls/libc.so.6(__libc_start_main+0xd0) [0xb7d2eeb0]
>    #16 smbd [0x8079db1]

Here's the lead up to it:

[2006/04/09 09:36:54, 1] smbd/service.c:make_connection_snum(642)
  192.168.111.203 (192.168.111.203) connect to service ustv initially as
user ORCAS\tivo (uid=0, gid=10000) (pid 1077)
[2006/04/09 09:37:05, 1] smbd/service.c:close_cnum(830)
  192.168.111.203 (192.168.111.203) closed connection to service ustv
[2006/04/09 09:37:05, 0] lib/fault.c:fault_report(36)
  ===============================================================
[2006/04/09 09:37:05, 0] lib/fault.c:fault_report(37)
  INTERNAL ERROR: Signal 6 in pid 1077 (3.0.14a-Debian)
  Please read the appendix Bugs of the Samba HOWTO collection
[2006/04/09 09:37:05, 0] lib/fault.c:fault_report(39)
  ===============================================================
[2006/04/09 09:37:05, 0] lib/util.c:smb_panic2(1485)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 1077]
[2006/04/09 09:37:05, 1] smbd/service.c:make_connection_snum(642)
  192.168.111.203 (192.168.111.203) connect to service ustv initially as
user ORCAS\tivo (uid=0, gid=10000) (pid 1084)

And this is what it emailed to me:

The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for pid 1077 (/usr/sbin/smbd).

Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occured.  You are
encouraged to submit this information as a bug report to Debian.  For
information about the procedure for submitting bug reports , please see
http://www.debian.org/Bugs/Reporting or the reportbug(1) manpage.

(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
(no debugging symbols found)
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread -1212614976 (LWP 1077)]
(no debugging symbols found)
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0xb7dababe in waitpid () from /lib/tls/libc.so.6
#0  0xb7dababe in waitpid () from /lib/tls/libc.so.6
#1  0xb7d50dd9 in strtold_l () from /lib/tls/libc.so.6
#2  0x081e3a91 in smb_panic2 ()
#3  0x081e3a1a in smb_panic ()
#4  0x081d0e58 in dbgtext ()
#5  <signal handler called>
#6  0xb7d437c7 in raise () from /lib/tls/libc.so.6
#7  0xb7d4506b in abort () from /lib/tls/libc.so.6
#8  0xb7d81185 in free () from /lib/tls/libc.so.6
#9  0xb7d80fc5 in free () from /lib/tls/libc.so.6
#10 0xb7ed9d8e in remove_error_table () from /lib/libcom_err.so.2
#11 0xb7f0f8ef in krb5int_initialize_library () from /usr/lib/libkrb5.so.3
#12 0xb7f0f4fb in ?? () from /usr/lib/libkrb5.so.3
#13 0xb7f00000 in ?? ()
#14 0xb7f765b8 in ?? () from /usr/lib/libkrb5.so.3
#15 0xbfaf2798 in ?? ()
#16 0xb7f6db9a in ?? () from /usr/lib/libkrb5.so.3
#17 0xb7f6db84 in profile_ser_internalize () from /usr/lib/libkrb5.so.3

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