Kyle Huey writes:
> On Thu, May 19, 2022 at 11:05 AM Eric W. Biederman
> wrote:
>>
>> Sebastian Andrzej Siewior writes:
>>
>> > On 2022-05-18 20:26:05 [-0700], Kyle Huey wrote:
>> >> Is there a git branch somewhere I can pull to test this? It doesn't apply
>> >> cleanly to Linus's tip.
>> >
>>
On Fri, May 20, 2022 at 02:32:24PM -0500, Eric W. Biederman wrote:
> Sebastian Andrzej Siewior writes:
>
> > On 2022-05-18 17:49:50 [-0500], Eric W. Biederman wrote:
> >>
> >> For ptrace_stop to work on PREEMT_RT no spinlocks can be taken once
> >> ptrace_freeze_traced has completed successfully
Sebastian Andrzej Siewior writes:
> On 2022-05-18 17:49:50 [-0500], Eric W. Biederman wrote:
>>
>> For ptrace_stop to work on PREEMT_RT no spinlocks can be taken once
>> ptrace_freeze_traced has completed successfully. Which fundamentally
>> means the lock dance of dropping siglock and grabbing
On 2022-05-18 17:49:50 [-0500], Eric W. Biederman wrote:
> After this set of changes only cgroup_enter_frozen should remain a
> stumbling block for PREEMPT_RT in the ptrace_stop path.
Yes, I can confirm that. I have no systemd-less system at hand which
means I can't boot a kernel without CGROUP su
On 2022-05-18 17:49:50 [-0500], Eric W. Biederman wrote:
>
> For ptrace_stop to work on PREEMT_RT no spinlocks can be taken once
> ptrace_freeze_traced has completed successfully. Which fundamentally
> means the lock dance of dropping siglock and grabbing tasklist_lock does
> not work on PREEMPT_
Sebastian Andrzej Siewior writes:
> On 2022-05-18 20:26:05 [-0700], Kyle Huey wrote:
>> Is there a git branch somewhere I can pull to test this? It doesn't apply
>> cleanly to Linus's tip.
>
> https://kernel.googlesource.com/pub/scm/linux/kernel/git/ebiederm/user-namespace.git
> ptrace_stop-clea
On 2022-05-18 20:26:05 [-0700], Kyle Huey wrote:
> Is there a git branch somewhere I can pull to test this? It doesn't apply
> cleanly to Linus's tip.
https://kernel.googlesource.com/pub/scm/linux/kernel/git/ebiederm/user-namespace.git
ptrace_stop-cleanup-for-v5.19
> - Kyle
Sebastian
_
For ptrace_stop to work on PREEMT_RT no spinlocks can be taken once
ptrace_freeze_traced has completed successfully. Which fundamentally
means the lock dance of dropping siglock and grabbing tasklist_lock does
not work on PREEMPT_RT. So I have worked through what is necessary so
that tasklist_l
