On 12/09, CAI Qian wrote:
>
> ----- "Oleg Nesterov" <o...@redhat.com> wrote:
>
> > Thanks, but it doesn't fail for me on this machine...
>
> Hmm, it failed for me.
>
> # cd /root/ptrace-tests
>
> # make check
> ...
> FAIL: watchpoint
OMG. Yet another test-case fails on powerpc ???? I didn't see this
failure in the previous reports or missed it ...
I bet it fails without utrace too? (please don't tell it doesn't ;)
Did you see it fails on other ppc64 machines?
Oh well. I spent this day grepping arch/powerpc to understand how
PTRACE_SET_DEBUGREG works and what is the problem. But I am afraid
this time I need a help from someone who understands the hardware
magic on powerpc.
So far:
- the test-case looks correct to me
- gdb uses PTRACE_SET_DEBUGREG to implement "watch var" too,
and "watch" doesn't work.
- the tracee notices thread.dabr correctly and calls set_dabr
== pseries_set_dabr() from __switch_to
- but do_dabr() or DebugException() is never called.
Will continue tomorrow...
> # make biarch-check
> ...
> FAIL: ppc-dabr-race
Aaaaah. I didn't notice you did biarch-check, not check.
Will take a look later...
Oleg.
