Re: [Valgrind-users] Valgrind throws assertion on powerpc while trying to run 'ls'

[Vishal <vis...@gm...>]

> Hi Vishal,
> 
>  How about the other experiment where you build Valgrind with the default 
optimization
>  level turned off? i.e. start over (do a: make clean) and then do a: make 
CFLAGS="-O0 -g" 
> 
>  Also, I tried the following out:
> 
> ----
> anmol:/proj/ppc/DT/labhome/anmol/valgrind-3.8.1> git diff 
coregrind/m_machine.c
> diff --git a/coregrind/m_machine.c b/coregrind/m_machine.c
> index 6a77057..122674a 100644
> --- a/coregrind/m_machine.c
> +++ b/coregrind/m_machine.c
>  <at>  <at>  -1465,6 +1465,8  <at>  <at>  void 
VG_(machine_ppc64_set_clszB)( Int szB )
>  {
>     vg_assert(hwcaps_done);
> 
> +   VG_(printf)("\nmachine_ppc64_set_clszB() (post-
entry)/(vai.ppc_cache_line_szB: %d, szB:
> %d)\n", vai.ppc_cache_line_szB, szB);
> +
>     /* Either the value must not have been set yet (zero) or we can
>        tolerate it being set to the same value multiple times, as the
>        stack scanning logic in m_main is a bit stupid. */
>  <at>  <at>  -1473,6 +1475,7  <at>  <at>  void 
VG_(machine_ppc64_set_clszB)( Int szB )
> 
>     vg_assert(szB == 32 || szB == 64 || szB == 128);
>     vai.ppc_cache_line_szB = szB;
> +   VG_(printf)("\nmachine_ppc64_set_clszB() (pre-
exit)/(vai.ppc_cache_line_szB: %d, szB: %d)\n",
> vai.ppc_cache_line_szB, szB);
>  }
> anmol:/proj/ppc/DT/labhome/anmol/valgrind-3.8.1> ./bin/valgrind --leak-
check=full ~/hello
> 
> machine_ppc64_set_clszB() (post-entry)/(vai.ppc_cache_line_szB: 0, szB: 
128)
> 
> machine_ppc64_set_clszB() (pre-exit)/(vai.ppc_cache_line_szB: 128, szB: 
128)
> 
> machine_ppc64_set_clszB() (post-entry)/(vai.ppc_cache_line_szB: 128, szB: 
128)
> 
> machine_ppc64_set_clszB() (pre-exit)/(vai.ppc_cache_line_szB: 128, szB: 
128)
> 
> /* Usual Valgrind output... */
> anmol:/proj/ppc/DT/labhome/anmol/valgrind-3.8.1>
> ----
> 
>  If you could do the similar experiment for your Valgrind, we'll learn 
something about what is going on.
> 
> Regards,
> Anmol.

Hi Anmol,

Here's the dump you asked for.

machine_ppc64_set_clszB() (post-entry)/(vai.ppc_cache_line_szB: 0, szB: 128)

machine_ppc64_set_clszB() (pre-exit)/(vai.ppc_cache_line_szB: 128, szB: 128)

machine_ppc64_set_clszB() (post-entry)/(vai.ppc_cache_line_szB: 128, szB: 
32)

valgrind: m_machine.c:1382 (vgPlain_machine_ppc32_set_clszB): Assertion 
'vai.ppc_cache_line_szB == 0 || vai.ppc_cache_line_szB == szB' failed.
==12374==    at 0x38035274: ??? (in 
/workspace/sw/vishald/etc/lib/valgrind/memcheck-ppc32-linux)

sched status:
  running_tid=0

I took a look at  https://bugs.kde.org/show_bug.cgi?id=306587 as you 
suggested and it seems to be the same issue. The patch there is the same I 
tried in my installation. But just want to make sure it is correct.

Warm Regards,
Vishal