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Re: [PATCH] tools/ocaml: fill arch_config for ARM in domain_getinfolist
- To: Julian Vetter <julian.vetter@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 28 Jul 2026 13:58:04 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Andrii Sultanov <andriy.sultanov@xxxxxxxxxx>, Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxxxx>
- Delivery-date: Tue, 28 Jul 2026 12:58:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27/07/2026 10:11 am, Julian Vetter wrote:
> In the function alloc_domaininfo() the arch_config field in domaininfo
> is only filled inside #if defined(__i386__) || defined(__x86_64__). On
> ARM the field is left unpopulated. caml_alloc_tuple() does not zero new
> blocks,
Hmm. Yes it does. caml_alloc_tuple() calls caml_alloc() which
initialises with Val_unit everywhere.
It is only caml_alloc_small() which doesn't allocate, and potentially
ends up with garbage.
Do you have details of the crash? I think it ought to be a plain
NULL(ish) deference from trying to interpret Val_unit as a pointer.
~Andrew
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