On Tue, Sep 08, 2020 at 12:50:44PM -0400, Qian Cai wrote:
> > No, you're talking nonsense. We must not free @mm when
> > 'current->active_mm == mm', never.
>
> Yes, you are right. It still trigger this below on powerpc with today's
> linux-next by fuzzing for a while (saw a few times on recent
On Wed, Jul 22, 2020 at 03:44:06PM +0200, Peter Zijlstra wrote:
> On Wed, Jul 22, 2020 at 09:19:00AM -0400, Qian Cai wrote:
> > On Wed, Jul 22, 2020 at 12:06:37PM +0200, pet...@infradead.org wrote:
> > > On Thu, Jun 04, 2020 at 11:03:44AM -0400, Qian Cai wrote:
> > > > The linux-next commit
On Wed, Jul 22, 2020 at 09:19:00AM -0400, Qian Cai wrote:
> On Wed, Jul 22, 2020 at 12:06:37PM +0200, pet...@infradead.org wrote:
> > On Thu, Jun 04, 2020 at 11:03:44AM -0400, Qian Cai wrote:
> > > The linux-next commit bf2c59fce407 ("sched/core: Fix illegal RCU from
> > > offline CPUs") delayed,
On Wed, Jul 22, 2020 at 12:06:37PM +0200, pet...@infradead.org wrote:
> On Thu, Jun 04, 2020 at 11:03:44AM -0400, Qian Cai wrote:
> > The linux-next commit bf2c59fce407 ("sched/core: Fix illegal RCU from
> > offline CPUs") delayed,
> >
> > idle->active_mm = _mm;
> >
> > into finish_cpu() instead
On Thu, Jun 04, 2020 at 11:03:44AM -0400, Qian Cai wrote:
> The linux-next commit bf2c59fce407 ("sched/core: Fix illegal RCU from
> offline CPUs") delayed,
>
> idle->active_mm = _mm;
>
> into finish_cpu() instead of idle_task_exit() which results in a false
> positive warning that was originally
On Thu, Jun 04, 2020 at 11:03:44AM -0400, Qian Cai wrote:
> The linux-next commit bf2c59fce407 ("sched/core: Fix illegal RCU from
> offline CPUs") delayed,
>
> idle->active_mm = _mm;
>
> into finish_cpu() instead of idle_task_exit() which results in a false
> positive warning that was originally
The linux-next commit bf2c59fce407 ("sched/core: Fix illegal RCU from
offline CPUs") delayed,
idle->active_mm = _mm;
into finish_cpu() instead of idle_task_exit() which results in a false
positive warning that was originally designed in the commit 3eda69c92d47
("kernel/fork.c: detect early free
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