Le 26/04/2023 à 14:29, Michael Ellerman a écrit :
> Joel Fernandes writes:
>> On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
> ...
>>
>> Out of curiosity for PPC folks, why cannot 64-bit PPC use per-task
>> canary? Michael, is this an optimization? Adding Christophe as well
>> since it came
On Thu, Apr 27, 2023 at 10:13 PM Michael Ellerman wrote:
>
> Zhouyi Zhou writes:
> > On Thu, Apr 27, 2023 at 11:09 AM Michael Ellerman
> > wrote:
> >>
> >> Zhouyi Zhou writes:
> >> > On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou wrote:
> >> >> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman
Zhouyi Zhou writes:
> On Thu, Apr 27, 2023 at 11:09 AM Michael Ellerman wrote:
>>
>> Zhouyi Zhou writes:
>> > On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou wrote:
>> >> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman
>> >> wrote:
>> ...
>> >> >
>> >> > There's 12.2.0 here:
>> >> >
>> >> > h
On Thu, Apr 27, 2023 at 11:09 AM Michael Ellerman wrote:
>
> Zhouyi Zhou writes:
> > On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou wrote:
> >> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman
> >> wrote:
> ...
> >> >
> >> > There's 12.2.0 here:
> >> >
> >> > https://mirrors.edge.kernel.org/pu
On Thu, Apr 27, 2023 at 11:09 AM Michael Ellerman wrote:
>
> Zhouyi Zhou writes:
> > On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou wrote:
> >> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman
> >> wrote:
> ...
> >> >
> >> > There's 12.2.0 here:
> >> >
> >> > https://mirrors.edge.kernel.org/pu
Zhouyi Zhou writes:
> On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou wrote:
>> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman wrote:
...
>> >
>> > There's 12.2.0 here:
>> >
>> > https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/
>> >
>> > https://mirrors.edge.kerne
Peter Zijlstra writes:
> On Wed, Apr 26, 2023 at 09:44:22AM -0400, Joel Fernandes wrote:
>
>> How could you control which code paths don't have the stack protector?
>> Just curious.
>
> https://lkml.kernel.org/r/20230412-no_stackp-v2-0-116f9fe4b...@google.com
We also have some entire files disabl
On Wed, Apr 26, 2023 at 09:44:22AM -0400, Joel Fernandes wrote:
> How could you control which code paths don't have the stack protector?
> Just curious.
https://lkml.kernel.org/r/20230412-no_stackp-v2-0-116f9fe4b...@google.com
On Wed, Apr 26, 2023 at 8:30 AM Michael Ellerman wrote:
>
> Joel Fernandes writes:
> > On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
> ...
> >
> > Out of curiosity for PPC folks, why cannot 64-bit PPC use per-task
> > canary? Michael, is this an optimization? Adding Christophe as well
> > s
Joel Fernandes writes:
> On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
...
>
> Out of curiosity for PPC folks, why cannot 64-bit PPC use per-task
> canary? Michael, is this an optimization? Adding Christophe as well
> since it came in a few years ago via the following commit:
I think Christ
On Wed, Apr 26, 2023 at 10:15 AM Joel Fernandes wrote:
>
> Hi Zhouyi,
>
> On Wed, Apr 26, 2023 at 09:31:17AM +0800, Zhouyi Zhou wrote:
> [..]
> > Joel makes the learning process easier for me, indeed!
>
> I know that feeling being a learner myself ;-)
>
> > One question I have tried very hard to u
Hi Zhouyi,
On Wed, Apr 26, 2023 at 09:31:17AM +0800, Zhouyi Zhou wrote:
[..]
> Joel makes the learning process easier for me, indeed!
I know that feeling being a learner myself ;-)
> One question I have tried very hard to understand, but still confused.
> for now, I know
> r13 is fixed, but r1 i
On Wed, Apr 26, 2023 at 8:33 AM Joel Fernandes wrote:
>
> On Tue, Apr 25, 2023 at 9:50 AM Zhouyi Zhou wrote:
> >
> > Hi
> >
> > On Tue, Apr 25, 2023 at 9:40 PM Christophe Leroy
> > wrote:
> > >
> > >
> > >
> > > Le 25/04/2023 à 13:06, Joel Fernandes a écrit :
> > > > On Tue, Apr 25, 2023 at 6:58
On Tue, Apr 25, 2023 at 9:40 AM Christophe Leroy
wrote:
>
>
>
> Le 25/04/2023 à 13:06, Joel Fernandes a écrit :
> > On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
> >>
> >> hi
> >>
> >> On Tue, Apr 25, 2023 at 6:13 PM Peter Zijlstra
> >> wrote:
> >>>
> >>> On Mon, Apr 24, 2023 at 02:55:11PM
On Tue, Apr 25, 2023 at 9:50 AM Zhouyi Zhou wrote:
>
> Hi
>
> On Tue, Apr 25, 2023 at 9:40 PM Christophe Leroy
> wrote:
> >
> >
> >
> > Le 25/04/2023 à 13:06, Joel Fernandes a écrit :
> > > On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
> > >>
> > >> hi
> > >>
> > >> On Tue, Apr 25, 2023 at
Hi
On Tue, Apr 25, 2023 at 9:40 PM Christophe Leroy
wrote:
>
>
>
> Le 25/04/2023 à 13:06, Joel Fernandes a écrit :
> > On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
> >>
> >> hi
> >>
> >> On Tue, Apr 25, 2023 at 6:13 PM Peter Zijlstra
> >> wrote:
> >>>
> >>> On Mon, Apr 24, 2023 at 02:55:
Le 25/04/2023 à 13:06, Joel Fernandes a écrit :
> On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
>>
>> hi
>>
>> On Tue, Apr 25, 2023 at 6:13 PM Peter Zijlstra wrote:
>>>
>>> On Mon, Apr 24, 2023 at 02:55:11PM -0400, Joel Fernandes wrote:
This is amazing debugging Boqun, like a boss! On
Le 25/04/2023 à 13:53, Peter Zijlstra a écrit :
> On Tue, Apr 25, 2023 at 06:59:29AM -0400, Joel Fernandes wrote:
>>> I'm a little confused; the way I understand the whole stack protector
>>> thing to work is that we push a canary on the stack at call and on
>>> return check it is still valid. Si
On Tue, Apr 25, 2023 at 06:59:29AM -0400, Joel Fernandes wrote:
> > I'm a little confused; the way I understand the whole stack protector
> > thing to work is that we push a canary on the stack at call and on
> > return check it is still valid. Since in general tasks randomly migrate,
> > the per-c
On Tue, Apr 25, 2023 at 7:06 PM Joel Fernandes wrote:
>
> On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
> >
> > hi
> >
> > On Tue, Apr 25, 2023 at 6:13 PM Peter Zijlstra wrote:
> > >
> > > On Mon, Apr 24, 2023 at 02:55:11PM -0400, Joel Fernandes wrote:
> > > > This is amazing debugging Boqu
On Tue, Apr 25, 2023 at 6:58 AM Zhouyi Zhou wrote:
>
> hi
>
> On Tue, Apr 25, 2023 at 6:13 PM Peter Zijlstra wrote:
> >
> > On Mon, Apr 24, 2023 at 02:55:11PM -0400, Joel Fernandes wrote:
> > > This is amazing debugging Boqun, like a boss! One comment below:
> > >
> > > > > > Or something simple
On Tue, Apr 25, 2023 at 6:13 AM Peter Zijlstra wrote:
>
> On Mon, Apr 24, 2023 at 02:55:11PM -0400, Joel Fernandes wrote:
> > This is amazing debugging Boqun, like a boss! One comment below:
> >
> > > > > Or something simple I haven't thought of? :)
> > > >
> > > > At what points can r13 change?
hi
On Tue, Apr 25, 2023 at 6:13 PM Peter Zijlstra wrote:
>
> On Mon, Apr 24, 2023 at 02:55:11PM -0400, Joel Fernandes wrote:
> > This is amazing debugging Boqun, like a boss! One comment below:
> >
> > > > > Or something simple I haven't thought of? :)
> > > >
> > > > At what points can r13 chang
On Mon, Apr 24, 2023 at 02:55:11PM -0400, Joel Fernandes wrote:
> This is amazing debugging Boqun, like a boss! One comment below:
>
> > > > Or something simple I haven't thought of? :)
> > >
> > > At what points can r13 change? Only when some particular functions are
> > > called?
> > >
> >
> >
On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou wrote:
>
> hi
>
> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman wrote:
> >
> > Zhouyi Zhou writes:
> > > Dear PowerPC and RCU developers:
> > > During the RCU torture test on mainline (on the VM of Opensource Lab
> > > of Oregon State University), S
hi
On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman wrote:
>
> Zhouyi Zhou writes:
> > Dear PowerPC and RCU developers:
> > During the RCU torture test on mainline (on the VM of Opensource Lab
> > of Oregon State University), SRCU-P failed with __stack_chk_fail:
> ...
> > by debugging, I see the
On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman wrote:
>
> Zhouyi Zhou writes:
> > Dear PowerPC and RCU developers:
> > During the RCU torture test on mainline (on the VM of Opensource Lab
> > of Oregon State University), SRCU-P failed with __stack_chk_fail:
> ...
> > by debugging, I see the r10
Zhouyi Zhou writes:
> Dear PowerPC and RCU developers:
> During the RCU torture test on mainline (on the VM of Opensource Lab
> of Oregon State University), SRCU-P failed with __stack_chk_fail:
...
> by debugging, I see the r10 is assigned with r13 on c0226eb4,
> but if there is a context-
On Mon, Apr 24, 2023 at 12:29:00PM -0500, Segher Boessenkool wrote:
> On Mon, Apr 24, 2023 at 08:28:55AM -0700, Boqun Feng wrote:
> > On Mon, Apr 24, 2023 at 10:13:51AM -0500, Segher Boessenkool wrote:
> > > At what points can r13 change? Only when some particular functions are
> > > called?
> >
This is amazing debugging Boqun, like a boss! One comment below:
> > > Or something simple I haven't thought of? :)
> >
> > At what points can r13 change? Only when some particular functions are
> > called?
> >
>
> r13 is the local paca:
>
> register struct paca_struct *local_paca asm("r1
On Mon, Apr 24, 2023 at 08:28:55AM -0700, Boqun Feng wrote:
> On Mon, Apr 24, 2023 at 10:13:51AM -0500, Segher Boessenkool wrote:
> > At what points can r13 change? Only when some particular functions are
> > called?
>
> r13 is the local paca:
>
> register struct paca_struct *local_paca as
On Mon, Apr 24, 2023 at 10:13:51AM -0500, Segher Boessenkool wrote:
> Hi!
>
> On Mon, Apr 24, 2023 at 11:14:00PM +1000, Michael Ellerman wrote:
> > Boqun Feng writes:
> > > On Sat, Apr 22, 2023 at 09:28:39PM +0200, Joel Fernandes wrote:
> > >> On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
>
Hi!
On Mon, Apr 24, 2023 at 11:14:00PM +1000, Michael Ellerman wrote:
> Boqun Feng writes:
> > On Sat, Apr 22, 2023 at 09:28:39PM +0200, Joel Fernandes wrote:
> >> On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
> >> > by debugging, I see the r10 is assigned with r13 on c0226eb4,
> >>
Hi Boqun,
Thanks for debugging this ...
Boqun Feng writes:
> On Sat, Apr 22, 2023 at 09:28:39PM +0200, Joel Fernandes wrote:
>> On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
>> >
>> > Dear PowerPC and RCU developers:
>> > During the RCU torture test on mainline (on the VM of Opensource Lab
Thank Boqun for your wonderful analysis!
On Mon, Apr 24, 2023 at 8:33 AM Boqun Feng wrote:
>
> On Sat, Apr 22, 2023 at 09:28:39PM +0200, Joel Fernandes wrote:
> > On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
> > >
> > > Dear PowerPC and RCU developers:
> > > During the RCU torture test on
On Sat, Apr 22, 2023 at 09:28:39PM +0200, Joel Fernandes wrote:
> On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
> >
> > Dear PowerPC and RCU developers:
> > During the RCU torture test on mainline (on the VM of Opensource Lab
> > of Oregon State University), SRCU-P failed with __stack_chk_fai
On Sun, Apr 23, 2023 at 9:37 AM Zhouyi Zhou wrote:
>
> On Sun, Apr 23, 2023 at 3:19 AM Joel Fernandes wrote:
> >
> > Hi Zhouyi,
> Thank Joel for your quick response ;-)
> I will gradually provide all the necessary information to facilitate
> our chasing. Please do not hesitate email me
> if I hav
On Sun, Apr 23, 2023 at 3:19 AM Joel Fernandes wrote:
>
> Hi Zhouyi,
Thank Joel for your quick response ;-)
I will gradually provide all the necessary information to facilitate
our chasing. Please do not hesitate email me
if I have ignored any ;-)
>
> On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou w
On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
>
> Dear PowerPC and RCU developers:
> During the RCU torture test on mainline (on the VM of Opensource Lab
> of Oregon State University), SRCU-P failed with __stack_chk_fail:
> [ 264.381952][ T99] [c6c7bab0] [c10c67c0]
> dump_s
Hi Zhouyi,
On Sat, Apr 22, 2023 at 2:47 PM Zhouyi Zhou wrote:
>
> Dear PowerPC and RCU developers:
> During the RCU torture test on mainline (on the VM of Opensource Lab
> of Oregon State University), SRCU-P failed with __stack_chk_fail:
> [ 264.381952][ T99] [c6c7bab0] [c10c67
Dear PowerPC and RCU developers:
During the RCU torture test on mainline (on the VM of Opensource Lab
of Oregon State University), SRCU-P failed with __stack_chk_fail:
[ 264.381952][ T99] [c6c7bab0] [c10c67c0]
dump_stack_lvl+0x94/0xd8 (unreliable)
[ 264.383786][ T99] [c000
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