net vampire panic - was RE: Samba4 ADS BDC howto/help/status, please?

Matthias Dieter Wallnöfer mdw at
Fri Jan 22 10:44:57 MST 2010

Hi Brian,

Brian Dickson wrote:
> Okay, I tried that, and here's what I got:
> net -U Administrator vampire CONCERTIA
> Password for [CONCERTIA\Administrator]:
> talloc: double free error - first free may be at librpc/rpc/dcerpc_connect.c:809
> Bad talloc magic value - double free
> PANIC: Bad talloc magic value - double free
> BACKTRACE: 36 stack frames:
>   #0 net(call_backtrace+0x2b) [0x86e2ce7]
>   #1 net(smb_panic+0x226) [0x86e2fc1]
>   #2 net [0x86fbc2b]
>   #3 net [0x86fbcd4]
>   #4 net [0x86fbde2]
> ...
> uname -a output:
> Linux 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009 x86_64 GNU/Linux
> Samba4 version info: /usr/local/src/samba-4.0.0alpha11/source4
> Let me know if there's any other info you need (config files, for instance) to help figure out what is at fault...
This form of a backtrace doesn't help us that much. Therefore try to 
first do a full rebuild using "make clean" (or on GIT also "git-clean -d 
-f -x ." directly in the repo directory), "./", 
"./configure.developer" (important: to get the debug symbols on) and 
"make". Instead of running the net command alone, launch it under gdb: 
"gdb --args net -U Administrator%<password> vampire CONCERTIA". In the 
gdb console type the command "r" and when you get the SIGSEGV message, 
"bt full" (always terminate with enter). Try to copy the long backtrace 
in a textfile and post it here. Afterwards you can close gdb with "q".


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