Re: 2.6.23-rc6-mm1

Gabriel C
2007-09-18T22:42:32Z

Sam Ravnborg wrote:
> On Tue, Sep 18, 2007 at 03:42:58PM -0400, Miles Lane wrote:
>> On 9/18/07, Sam Ravnborg <sam@ravnborg.org> wrote:
>>> Hi Miles.
>>> On Tue, Sep 18, 2007 at 11:27:23AM -0400, Miles Lane wrote:
>>>> Selecting Help for "Subarchitecture Type" causes "make menuconfig" to
>>>> crash, and the bash display settings have to be reset.
>>> Not reproduceable here.
>>> But I noticed that we pass a null pointer to a vsprintf function which
>>> in the cases you pointed out printed a (null) at my system.
>>> Could you plase try if attached patch fix your system.
>> Sorry, it still crashes. I am running Ubuntu pre-6.10 (Gutsy -- the
>> development version of the distro). Maybe I should try "make
>> mrproper" first?
>
> make mrproper should not do any difference here.
> I rather think you hit some ncurses bug.
>
> If you could add '-g' to HOSTCFLAGS in top-level Makefile
> and then do:
> rm scripts/kconfig/mconf.o scripts/kconfig/mconf
> make menuconfig
>
> (to build mconf and to check that the error is still reproduceable).
> And then run it in a debugger like this:
> gdb scripts/kconfig/mconf
> run arch/x86_64/Kconfig
> ^^^^^^ replace with your actual arch
>
> Provoke the error and get a back-trace with 'bt'.

Hi Sam,

I can reproduce this bug on Frugalware Linux.

Here the bt:

Program received signal SIGSEGV, Segmentation fault.
0xb7dc4143 in strlen () from /lib/libc.so.6
(gdb) bt
#0 0xb7dc4143 in strlen () from /lib/libc.so.6
#1 0x0804fd60 in str_append (gs=0xbfe4f6e8, s=0x0) at scripts/kconfig/util.c:87
#2 0x0804e0cb in expr_print (e=0x8e22df8, fn=0x804fda0 <expr_print_gstr_helper>, data=0xbfe4f6e8, prevtoken=0) at scripts/kconfig/expr.c:1037
#3 0x0804e1e7 in expr_gstr_print (e=0x8e22df8, gs=0xbfe4f6e8) at scripts/kconfig/expr.c:1099
#4 0x0804a07e in get_symbol_str (r=0xbfe4f6e8, sym=0x8b54ee8) at scripts/kconfig/mconf.c:334
#5 0x0804a363 in show_help (menu=0x8b54f88) at scripts/kconfig/mconf.c:738
#6 0x0804acec in conf (menu=0x8b69480) at scripts/kconfig/mconf.c:781
#7 0x0804a971 in conf (menu=0x8063c40) at scripts/kconfig/mconf.c:703
#8 0x0804af8a in main (ac=Cannot access memory at address 0x0
) at scripts/kconfig/mconf.c:917

Looks somewhat strange -> http://194.231.229.228/menuconfig.png

PS: Is without the patch you posted , I'll try with in a bit

>
> Thanks,
> Sam

Gabriel