On Sun, Oct 1, 2023 at 10:27 AM Neeraj upadhyay wrote:
>
> On Sun, Oct 1, 2023 at 5:49 AM Joel Fernandes wrote:
> >
> > On Sat, Sep 30, 2023 at 6:01 AM Neeraj upadhyay
> > wrote:
> > >
> > > On Fri, Sep 29, 2023 at 3:35 AM Joel Fernandes
> > > wrote:
> > > >
> > > > Hello,
> > > > Firstly, ku
On Fri, Sep 29, 2023 at 5:39 AM Joel Fernandes wrote:
>
> Hello,
> Firstly, kudos to the detailed report and analysis. Rare failures are
> hard and your usage crash/kdump is awesome to dig deeper into the
> issue..
>
> On Thu, Sep 28, 2023 at 3:59 AM zhuangel570 wrote:
> >
> > Hi,
> >
> > We enco
On Tue, Oct 3, 2023 at 5:52 PM Frederic Weisbecker wrote:
>
> On Mon, Oct 02, 2023 at 11:09:39PM +0200, Frederic Weisbecker wrote:
> > > > spin_unlock_rcu_node(sdp); /* Interrupts remain disabled. */
> > > > WRITE_ONCE(ssp->srcu_sup->srcu_gp_start, jiffies);
> > > > WRITE_
On Mon, Oct 02, 2023 at 11:09:39PM +0200, Frederic Weisbecker wrote:
> > > spin_unlock_rcu_node(sdp); /* Interrupts remain disabled. */
> > > WRITE_ONCE(ssp->srcu_sup->srcu_gp_start, jiffies);
> > > WRITE_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay, 0);
> > > @@ -1245,7 +1243,18
On Tue, Oct 3, 2023 at 4:16 AM Frederic Weisbecker wrote:
>
> Le Mon, Oct 02, 2023 at 07:51:10AM +0530, Neeraj upadhyay a écrit :
> > > And if this works, can we then remove srcu_invoke_callbacks()
> > > self-requeue?
> > > If queued several times before it actually fires, it will catch the lates
On Tue, 3 Oct, 2023, 2:39 am Frederic Weisbecker, wrote:
>
> Le Mon, Oct 02, 2023 at 06:52:27PM +0530, Neeraj upadhyay a écrit :
> > On Mon, Oct 2, 2023 at 4:11 PM Frederic Weisbecker
> > wrote:
> > > Also the role of the remaining advance in srcu_gp_start() is unclear to
> > > me...
> > >
> >
Le Mon, Oct 02, 2023 at 07:51:10AM +0530, Neeraj upadhyay a écrit :
> > And if this works, can we then remove srcu_invoke_callbacks() self-requeue?
> > If queued several times before it actually fires, it will catch the latest
> > grace period's end. And if queued while the callback runs, it will r
Le Mon, Oct 02, 2023 at 06:52:27PM +0530, Neeraj upadhyay a écrit :
> On Mon, Oct 2, 2023 at 4:11 PM Frederic Weisbecker
> wrote:
> > Also the role of the remaining advance in srcu_gp_start() is unclear to
> > me...
> >
>
> As far as I understand, the advance call before accelerate is to make
>
On Mon, Oct 2, 2023 at 4:11 PM Frederic Weisbecker wrote:
>
> On Mon, Oct 02, 2023 at 07:47:55AM +0530, Neeraj upadhyay wrote:
> > On Mon, Oct 2, 2023 at 4:02 AM Frederic Weisbecker
> > wrote:
> > >
> > > Le Sun, Oct 01, 2023 at 07:57:14AM +0530, Neeraj upadhyay a écrit :
> > > >
> > > > But "mo
On Mon, Oct 02, 2023 at 07:51:10AM +0530, Neeraj upadhyay wrote:
> On Mon, Oct 2, 2023 at 4:10 AM Frederic Weisbecker
> wrote:
> > And if this works, can we then remove srcu_invoke_callbacks() self-requeue?
> > If queued several times before it actually fires, it will catch the latest
> > grace p
On Mon, Oct 02, 2023 at 07:47:55AM +0530, Neeraj upadhyay wrote:
> On Mon, Oct 2, 2023 at 4:02 AM Frederic Weisbecker
> wrote:
> >
> > Le Sun, Oct 01, 2023 at 07:57:14AM +0530, Neeraj upadhyay a écrit :
> > >
> > > But "more" only checks for CBs in DONE tail. The callbacks which have
> > > been
On Mon, Oct 2, 2023 at 4:10 AM Frederic Weisbecker wrote:
>
> Le Mon, Oct 02, 2023 at 12:32:41AM +0200, Frederic Weisbecker a écrit :
> > Le Sun, Oct 01, 2023 at 07:57:14AM +0530, Neeraj upadhyay a écrit :
> > >
> > > But "more" only checks for CBs in DONE tail. The callbacks which have
> > > bee
On Mon, Oct 2, 2023 at 4:02 AM Frederic Weisbecker wrote:
>
> Le Sun, Oct 01, 2023 at 07:57:14AM +0530, Neeraj upadhyay a écrit :
> >
> > But "more" only checks for CBs in DONE tail. The callbacks which have been
> > just
> > accelerated are not advanced to DONE tail.
> >
> > Having said above, I
Le Mon, Oct 02, 2023 at 12:32:41AM +0200, Frederic Weisbecker a écrit :
> Le Sun, Oct 01, 2023 at 07:57:14AM +0530, Neeraj upadhyay a écrit :
> >
> > But "more" only checks for CBs in DONE tail. The callbacks which have been
> > just
> > accelerated are not advanced to DONE tail.
> >
> > Having
Le Sun, Oct 01, 2023 at 07:57:14AM +0530, Neeraj upadhyay a écrit :
>
> But "more" only checks for CBs in DONE tail. The callbacks which have been
> just
> accelerated are not advanced to DONE tail.
>
> Having said above, I am still trying to figure out, which callbacks
> are actually being poin
On Sun, Oct 1, 2023 at 5:49 AM Joel Fernandes wrote:
>
> On Sat, Sep 30, 2023 at 6:01 AM Neeraj upadhyay
> wrote:
> >
> > On Fri, Sep 29, 2023 at 3:35 AM Joel Fernandes
> > wrote:
> > >
> > > Hello,
> > > Firstly, kudos to the detailed report and analysis. Rare failures are
> > > hard and your
On Sat, Sep 30, 2023 at 6:01 AM Neeraj upadhyay wrote:
>
> On Fri, Sep 29, 2023 at 3:35 AM Joel Fernandes wrote:
> >
> > Hello,
> > Firstly, kudos to the detailed report and analysis. Rare failures are
> > hard and your usage crash/kdump is awesome to dig deeper into the
> > issue..
> >
> > On Th
On Fri, Sep 29, 2023 at 3:04 AM zhuangel570 wrote:
>
> Hi,
>
> We encounter SRCU hung issue in stable tree 5.4.203, we are running VM create
> and destroy concurrent test, the issue happens after several weeks. Now we
> didn't have a way to reproduce this issue, the issue happens randomly, this
>
On Fri, Sep 29, 2023 at 3:35 AM Joel Fernandes wrote:
>
> Hello,
> Firstly, kudos to the detailed report and analysis. Rare failures are
> hard and your usage crash/kdump is awesome to dig deeper into the
> issue..
>
> On Thu, Sep 28, 2023 at 3:59 AM zhuangel570 wrote:
> >
> > Hi,
> >
> > We enco
On Sat, Sep 30, 2023 at 2:40 PM Frederic Weisbecker wrote:
>
> Le Sat, Sep 30, 2023 at 08:15:06AM +0530, Neeraj upadhyay a écrit :
> > On Sat, Sep 30, 2023 at 4:15 AM Frederic Weisbecker
> > wrote:
> > >
> > > Le Thu, Sep 28, 2023 at 05:39:17PM -0400, Joel Fernandes a écrit :
> > > > If srcu_inv
Le Sat, Sep 30, 2023 at 08:15:06AM +0530, Neeraj upadhyay a écrit :
> On Sat, Sep 30, 2023 at 4:15 AM Frederic Weisbecker
> wrote:
> >
> > Le Thu, Sep 28, 2023 at 05:39:17PM -0400, Joel Fernandes a écrit :
> > > If srcu_invoke_callbacks() was really called for the rdp, I would have
> > > expected
On Sat, Sep 30, 2023 at 08:15:06AM +0530, Neeraj upadhyay wrote:
> On Sat, Sep 30, 2023 at 4:15 AM Frederic Weisbecker
> wrote:
> >
> > Le Thu, Sep 28, 2023 at 05:39:17PM -0400, Joel Fernandes a écrit :
> > > If srcu_invoke_callbacks() was really called for the rdp, I would have
> > > expected rc
On Sat, Sep 30, 2023 at 4:15 AM Frederic Weisbecker wrote:
>
> Le Thu, Sep 28, 2023 at 05:39:17PM -0400, Joel Fernandes a écrit :
> > If srcu_invoke_callbacks() was really called for the rdp, I would have
> > expected rcu_segcblist_advance() to advance all those pending
> > callbacks to 304.
> >
>
Le Thu, Sep 28, 2023 at 05:39:17PM -0400, Joel Fernandes a écrit :
> If srcu_invoke_callbacks() was really called for the rdp, I would have
> expected rcu_segcblist_advance() to advance all those pending
> callbacks to 304.
>
> I posit that probably srcu_invoke_callbacks() is not even being called
On Fri, Sep 29, 2023 at 6:05 AM Joel Fernandes wrote:
>
> Hello,
> Firstly, kudos to the detailed report and analysis. Rare failures are
> hard and your usage crash/kdump is awesome to dig deeper into the
> issue..
>
> On Thu, Sep 28, 2023 at 3:59 AM zhuangel570 wrote:
> >
> > Hi,
> >
> > We enco
On Thu, Sep 28, 2023 at 5:39 PM Joel Fernandes wrote:
>
> Hello,
> Firstly, kudos to the detailed report and analysis. Rare failures are
> hard and your usage crash/kdump is awesome to dig deeper into the
> issue..
>
> On Thu, Sep 28, 2023 at 3:59 AM zhuangel570 wrote:
> >
> > Hi,
> >
> > We enco
Hello,
Firstly, kudos to the detailed report and analysis. Rare failures are
hard and your usage crash/kdump is awesome to dig deeper into the
issue..
On Thu, Sep 28, 2023 at 3:59 AM zhuangel570 wrote:
>
> Hi,
>
> We encounter SRCU hung issue in stable tree 5.4.203, we are running VM create
> and
Hi,
We encounter SRCU hung issue in stable tree 5.4.203, we are running VM create
and destroy concurrent test, the issue happens after several weeks. Now we
didn't have a way to reproduce this issue, the issue happens randomly, this
is the second time we found it in this year.
We did some investi
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