On 17/01/2025 19:13, Lorenzo Stoakes wrote:
>
> +cc Mike
>
> OK so nothing to worry about here - the feature that causes this problem
> has been completely disabled. This may not be in Linus's tree yet but will
> be for 6.13 release [0].
>
> I think the vread_iter() check for 0 can wait for 6.14, as once the area of
> memory is identified this should never happen, but we do want to pick up on
> it, with a WARN_ON_ONCE() to catch stuff like this right away.
>
> Thanks so much for the repro, though I observed the 'core /proc/kcore'
> command freezing up before any 'disass' in my qemu setup, interestingly!
>
> [0]:https://lore.kernel.org/all/20250113112934.GA8385@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
Thank you for the fast fix, I'm back on track :)
Dump of assembler code for function ice_process_skb_fields:
0xffffffffc0fc1eb0 <+0>: nopw (%rax)
0xffffffffc0fc1eb4 <+4>: nopl 0x0(%rax,%rax,1)
0xffffffffc0fc1eb9 <+9>: push %r14
0xffffffffc0fc1ebb <+11>: push %r13
-Alex
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