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

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On Mon, 30 Oct 2023, Marek Marczykowski-Górecki wrote:

> > Well, it would be possible that larger pages in a bio would trip e.g. bio
> > splitting due to maximum segment size the disk supports (which can be e.g.
> > 0xffff) and that upsets something somewhere. But this is pure
> > speculation. We definitely need more debug data to be able to tell more.
> 
> I can collect more info, but I need some guidance how :) Some patch
> adding extra debug messages?
> Note I collect those via serial console (writing to disk doesn't work
> when it freezes), and that has some limits in the amount of data I can
> extract especially when printed quickly. For example sysrq-t is too much.
> Or maybe there is some trick to it, like increasing log_bug_len?

If you can do more tests, I would suggest this:

We already know that it works with order 3 and doesn't work with order 4.

So, in the file include/linux/mmzone.h, change PAGE_ALLOC_COSTLY_ORDER 
from 3 to 4 and in the file drivers/md/dm-crypt.c leave "unsigned int 
order = PAGE_ALLOC_COSTLY_ORDER" there.

Does it deadlock or not?

So, that we can see whether the deadlock depends on 
PAGE_ALLOC_COSTLY_ORDER or whether it is just a coincidence.

Mikulas

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