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

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On Mon, 30 Oct 2023, Vlastimil Babka wrote:

> Ah, missed that. And the traces don't show that we would be waiting for
> that. I'm starting to think the allocation itself is really not the issue
> here. Also I don't think it deprives something else of large order pages, as
> per the sysrq listing they still existed.
> 
> What I rather suspect is what happens next to the allocated bio such that it
> works well with order-0 or up to costly_order pages, but there's some
> problem causing a deadlock if the bio contains larger pages than that?

Yes. There are many "if (order > PAGE_ALLOC_COSTLY_ORDER)" branches in the 
memory allocation code and I suppose that one of them does something bad 
and triggers this bug. But I don't know which one.

> Cc Honza. The thread starts here:
> https://lore.kernel.org/all/ZTNH0qtmint%2FzLJZ@mail-itl/
> 
> The linked qubes reports has a number of blocked task listings that can be
> expanded:
> https://github.com/QubesOS/qubes-issues/issues/8575

Mikulas





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