> > On 2.6.23 it could happen even without loopback
>
> Let's focus on this point, because we already know how the lockup
> happens _with_ loopback and any other kind of bdi stacking.
>
> Can you describe the setup? Or better still, can you reproduce it and
> post the sysrq-t output?
Hi
The tr
> On 2.6.23 it could happen even without loopback
Let's focus on this point, because we already know how the lockup
happens _with_ loopback and any other kind of bdi stacking.
Can you describe the setup? Or better still, can you reproduce it and
post the sysrq-t output?
Thanks,
Miklos
-
To unsu
> > Why are there over-limit dirty pages that no one is writing?
>
> Please do a sysrq-t, and cat /proc/vmstat during the hang. Those
> will show us what exactly is happening.
I did and I posted relevant information from my finding --- it looped in
balance_dirty_pages.
> I've seen this type of
> > > Arguably we just have the wrong backing-device here, and what we should do
> > > is to propagate the real backing device's pointer through up into the
> > > filesystem. There's machinery for this which things like DM stacks use.
> > >
> > > I wonder if the post-2.6.23 changes happened to ma
> > > Arguably we just have the wrong backing-device here, and what we
> > > should do is to propagate the real backing device's pointer through
> > > up into the filesystem. There's machinery for this which things
> > > like DM stacks use.
Just thinking about the new implementation --- you sh
On Sun, 11 Nov 2007, Mikulas Patocka wrote:
> On Sat, 10 Nov 2007, Andrew Morton wrote:
>
> > On Sat, 10 Nov 2007 20:51:31 +0100 (CET) Mikulas Patocka <[EMAIL
> > PROTECTED]> wrote:
> >
> > > Hi
> > >
> > > I am experiencing a transient lockup in 'D' state with loopback device.
> > > It
> >
> > Arguably we just have the wrong backing-device here, and what we should do
> > is to propagate the real backing device's pointer through up into the
> > filesystem. There's machinery for this which things like DM stacks use.
> >
> > I wonder if the post-2.6.23 changes happened to make this pr
On Sat, 10 Nov 2007, Andrew Morton wrote:
> On Sat, 10 Nov 2007 20:51:31 +0100 (CET) Mikulas Patocka <[EMAIL PROTECTED]>
> wrote:
>
> > Hi
> >
> > I am experiencing a transient lockup in 'D' state with loopback device. It
> > happens when process writes to a filesystem in loopback with comma
On Sat, 2007-11-10 at 14:54 -0800, Andrew Morton wrote:
> On Sat, 10 Nov 2007 20:51:31 +0100 (CET) Mikulas Patocka <[EMAIL PROTECTED]>
> wrote:
>
> > Hi
> >
> > I am experiencing a transient lockup in 'D' state with loopback device. It
> > happens when process writes to a filesystem in loopbac
On Sat, 10 Nov 2007 20:51:31 +0100 (CET) Mikulas Patocka <[EMAIL PROTECTED]>
wrote:
> Hi
>
> I am experiencing a transient lockup in 'D' state with loopback device. It
> happens when process writes to a filesystem in loopback with command like
> dd if=/dev/zero of=/s/fill bs=4k
>
> CPU is idl
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