[PATCH v4 23/35] vdso/datastore: Map pages through struct page

[Thomas Weißschuh]

Hi Mark,

On Thu, Nov 06, 2025 at 01:28:35PM +0000, Mark Brown wrote:
> On Tue, Nov 04, 2025 at 09:44:38AM +0100, Marek Szyprowski wrote:
> > On 03.11.2025 16:24, Mark Brown wrote:
> > > On Tue, Oct 14, 2025 at 08:49:09AM +0200, Thomas Weißschuh wrote:
> 
> Copying in Ryan Roberts who's much more likely to have some idea about
> memory management stuff for arm64 than I am (I have been poking at this
> a bit but not got anywhere notable).  Not deleting context for his
> benefit.

It turned out not even to be an mm problem.
Instead the data pages were not zeroed out on allocation.

> Given that this issue is very disruptive to userspace it's causing us to
> miss huge amounts of test coverage for -next, would it be possible to
> drop these patches until we resolve the issue?

This issue and the observed panics should be fixed in v5 of the series:
https://lore.kernel.org/lkml/20251106-vdso-sparc64-generic-2-v5-0-97ff2b6542f7@linutronix.de/

I'll ping tglx directly.

(...)


Thomas