Re: zsh seg fault when TERM = linux

["Murilo Opsfelder Araújo" <mopsfelder@gmail.com>]

On Thu, Apr 30, 2009 at 10:54 AM, Peter Stephenson <pws@csr.com> wrote:
> =?ISO-8859-1?Q?Murilo_Opsfelder_Ara=FAjo?= wrote:
>> TERM env var on client side is set to 'linux':
>>
>> server$ gdb zsh
>> (gdb) bt
>> #0  0x283784bd in strlen () from /lib/libc.so.7
>> #1  0x282f600e in cgetset () from /lib/libc.so.7
>> #2  0x282f64f2 in cgetent () from /lib/libc.so.7
>> #3  0x2824940e in _nc_read_termcap_entry () from /lib/libncursesw.so.7
>> #4  0x2826accf in _nc_read_entry () from /lib/libncursesw.so.7
>> #5  0x28268d47 in _nc_setupterm () from /lib/libncursesw.so.7
>> #6  0x2823d928 in tgetent () from /lib/libncursesw.so.7
>> #7  0x0807bd29 in init_term ()
>> #8  0x0809593b in setstrvalue ()
>> #9  0x08099ba7 in assignsparam ()
>> #10 0x0809ab3e in createparamtable ()
>> #11 0x0807b9df in setupvals ()
>> #12 0x0807d6ce in zsh_main ()
>> #13 0x08052e32 in main ()
>> (gdb)
>>
>> Does gdb seem to be OK?
>
> Yes, the backtrace makes sense.  However, the crash is down inside the
> library code, where zsh calls tgetent().  The shell simply passes down
> the terminal name, i.e. the string "linux", and maybe a buffer.  It's
> going through calls to ncursesw and libc, which is correct.
>
> Do you have the configuration for this version of zsh?  Can you see if
> the option TGETENT_ACCEPTS_NULL is #define'd in config.h?  It should be
> under Linux, but if it wasn't it might be that the 2048-byte buffer was
> too short.  If the option is set, it's hard to see how the shell could
> be causing this.  Indeed, I see in the manual page for tgetent that the
> buffer pointer is ignored, although it wasn't specially about ncursesw.
>
> Can you post the output of "infocmp -C linux" on the system where it's
> crashing?
>
> Thanks.
>
> --
> Peter Stephenson <pws@csr.com>                  Software Engineer
> CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
> Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070
>

The server side /etc/zshrc:
http://pastebin.com/m65da7ea1

How can I see in zsh of server side if TGETENT_ACCEPTS_NULL is set?

On the server side (where zsh crashes) there is no command 'infocmp'.
The server is running FreeBSD. On the client side, here is the output
of 'infocmp -C linux':
http://pastebin.com/m352212c1

Thanks in advance.

-- 
Murilo Opsfelder Araujo
mopsfelder@gmail.com
{murilo,panda}@bsd.com.br
BSD will never die.
"Tempo difícil esse em que estamos, em que é mais fácil quebrar um
átomo do que um preconceito." - Albert Einstein