On Tue, Nov 04, 2025 at 09:44:38AM +0100, Marek Szyprowski wrote:

On 03.11.2025 16:24, Mark Brown wrote:

quoted

We do have some other serious breakage affecting arm64 in -next which
are making it hard to get a clear picture of which platforms are
affected, at least the FVP and O6 are unaffected by those other issues
(due to using MTE on platforms that don't have it, those platforms do
have MTE).

I got almost the same result while bisecting on ARM 32bit Exynos-based 
boards, so the issue with this patchset is not fully ARM64 specific. For 
some reasons it also doesn't affect all systems though. It is even 
worse, because it affected only a subset of boards, but different for 
each tested commit. The observed failure looks exactly the same:

I've now got the results for this specific commit, it looks like every
single arm64 system is failing.  I didn't test any other architectures.

Then I've tested it on ARM64bit (RaspberrryPi3b+ board) and got the 
following panic on 6a011a228293 ("vdso/datastore: Map pages through 
struct page") commit:

I'm seeing the same thing on at least some of the systems - this is with
arm64 defconfig (I suspect that's what Marek is doing too).  For
example:

   https://lava.sirena.org.uk/scheduler/job/2039543#L1109

I didn't check every single failure.  Feeding one of the backtraces
through addr2line says:

/build/stage/linux/include/linux/page-flags.h:284 (discriminator 2)
/build/stage/linux/mm/mmap.c:1438
/build/stage/linux/mm/memory.c:5280
/build/stage/linux/mm/memory.c:5698
/build/stage/linux/mm/memory.c:6487
/build/stage/linux/arch/arm64/mm/fault.c:696
/build/stage/linux/arch/arm64/mm/fault.c:793
/build/stage/linux/arch/arm64/mm/fault.c:929 (discriminator 1)
/build/stage/linux/arch/arm64/include/asm/irqflags.h:55
/build/stage/linux/arch/arm64/kernel/entry-common.c:767
/build/stage/linux/arch/arm64/kernel/entry.S:596

(this is for this specific commit.)