Re: Intermittent storage (dm-crypt?) freeze - regression 6.4->6.5

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On Tue, Oct 31, 2023 at 03:01:36PM +0100, Jan Kara wrote:
> On Tue 31-10-23 04:48:44, Marek Marczykowski-Górecki wrote:
> > Then tried:
> >  - PAGE_ALLOC_COSTLY_ORDER=4, order=4 - cannot reproduce,
> >  - PAGE_ALLOC_COSTLY_ORDER=4, order=5 - cannot reproduce,
> >  - PAGE_ALLOC_COSTLY_ORDER=4, order=6 - freeze rather quickly
> > 
> > I've retried the PAGE_ALLOC_COSTLY_ORDER=4,order=5 case several times
> > and I can't reproduce the issue there. I'm confused...
> 
> And this kind of confirms that allocations > PAGE_ALLOC_COSTLY_ORDER
> causing hangs is most likely just a coincidence. Rather something either in
> the block layer or in the storage driver has problems with handling bios
> with sufficiently high order pages attached. This is going to be a bit
> painful to debug I'm afraid. How long does it take for you trigger the
> hang? I'm asking to get rough estimate how heavy tracing we can afford so
> that we don't overwhelm the system...

Sometimes it freezes just after logging in, but in worst case it takes
me about 10min of more or less `tar xz` + `dd`.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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