Bug#441975: still here

[Gallien Matthieu <matthieu_gallien@yahoo.fr>]

Le Friday 19 October 2007 10:45:47 Aurelien Jarno, vous avez écrit :
> Gallien Matthieu a écrit :
> > Hi,
> >
> > I can confirm that if /etc/ld.so.nohwcap exists, running perl -e "use Qt"
> > leads to a segfault in an up to date unstable. And thus at each upgrade
> > of libc6 the problem occurs.
>
> Which is something really strange. When this file exists, the dynamic
> loader uses the non-optimized version of the glibc instead of the normal
> one, but they are both ABI compatible. I guess that either your
> non-optimized glibc is broken or libqt-perl is doing bad things.
>
> Could you please tell me what's the output of "ldd /usr/bin/perl" when
> the /etc/ld.so.nohwcap file is present and when it is not?

ldd /usr/bin/perl without /etc/ld.so.nohwcap

        linux-gate.so.1 =>  (0xffffe000)
        libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb7f46000)
        libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb7f21000)
        libpthread.so.0 => /lib/i686/cmov/libpthread.so.0 (0xb7f0a000)
        libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7dc2000)
        libcrypt.so.1 => /lib/i686/cmov/libcrypt.so.1 (0xb7d94000)
        /lib/ld-linux.so.2 (0xb7f68000)

ldd /usr/bin/perl with /etc/ld.so.nohwcap

        linux-gate.so.1 =>  (0xffffe000)
        libdl.so.2 => /lib/libdl.so.2 (0xb7fa5000)
        libm.so.6 => /lib/libm.so.6 (0xb7f7f000)
        libpthread.so.0 => /lib/libpthread.so.0 (0xb7f67000)
        libc.so.6 => /lib/libc.so.6 (0xb7e1f000)
        libcrypt.so.1 => /lib/libcrypt.so.1 (0xb7df1000)
        /lib/ld-linux.so.2 (0xb7fc6000)

>
> Also do you have a backtrace of the segfault?

#0  0x40c02898 in ?? ()
#1  0xb7d6a6a8 in ?? () from /lib/libc.so.6
#2  0xbfc4d100 in ?? ()
#3  0xbfc4d074 in ?? ()
#4  0xb7e83ff4 in ?? () from /lib/libc.so.6
#5  0xbfc4d094 in ?? ()
#6  0xb7d6a5ec in siglongjmp () from /lib/libc.so.6
Backtrace stopped: frame did not save the PC

Not a usable one. I suppose I should install debug packages.

Starting program: /usr/bin/debugperl -e "use Qt"
[Thread debugging using libthread_db enabled]
[New Thread 0xb7ddd8c0 (LWP 16091)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7ddd8c0 (LWP 16091)]
0x40d62898 in ?? ()
(gdb) bt
#0  0x40d62898 in ?? ()
#1  0xb7e366a8 in _longjmp_unwind () from /lib/libc.so.6
#2  0xb7e365ec in siglongjmp () from /lib/libc.so.6
#3  0xb7f5f8d4 in siglongjmp () from /lib/libpthread.so.0
#4  0x0806fb7f in S_my_exit_jump (my_perl=0x81bc008) at perl.c:5334
#5  0x0806f6ea in Perl_my_exit (my_perl=0x81bc008, status=0) at perl.c:5282
#6  0x08069263 in S_run_body (my_perl=0x81bc008, oldscope=1) at perl.c:2368
#7  0x08068c85 in perl_run (my_perl=0x81bc008) at perl.c:2283
#8  0x080638cf in main (argc=3, argv=0xbffa6db4, env=0xbffa6dc4) at 
perlmain.c:99

-- 
Gallien Matthieu