Re: [BUG] General Protection Faults During Git Clone and Kernel Build on Latest Kernel

[Catalin Marinas <catalin.marinas@arm.com>]

On Mon, Nov 17, 2025 at 01:24:43PM +0100, David Hildenbrand (Red Hat) wrote:
> On 17.11.25 13:08, Longia, Amandeep Kaur wrote:
> > Hi all,
> > 
> > We've encountered critical issues while running our CI pipeline on the
> > latest kernel (v6.18-rc6), which involves cloning multiple repositories
> > for testing and building the kernel. During this process, we observed
> > two major issues:
> 
> Hi,
> 
> I observed something similar while testing on Friday between rc4 (good) and
> rc5+ (bad).
> 
> I'm sure this it the known issue of adfb6609c6809e107ded9a1cd46f519c882e64ea
> we discussed already here [1].
> 
> 
> @Jan, can you send the fix out today? Otherwise I can take care of this so
> we get this fixed asap.
> 
> [1] https://lkml.kernel.org/r/20251109003613.1461433-1-japo@linux.ibm.com

In the worst case, I think Andrew can just revert commit  adfb6609c680
("mm/huge_memory: initialise the tags of the huge zero folio"), we can
fix it properly with a cc stable afterwards.

BTW, another quick fix (pretty much what arm64 does when MTE is off):

-------8<--------------------------
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 105cc4c00cc3..2b848a66f150 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -253,6 +253,7 @@ static inline void clear_highpage_kasan_tagged(struct page *page)

 static inline void tag_clear_highpage(struct page *page)
 {
+	clear_highpage(page);
 }

 #endif