Re: Kernel oops with 6.14 when enabling TLS

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Mon, Mar 03, 2025 at 02:27:06PM +0000, Matthew Wilcox wrote:
> We have a _lot_ of page types available.  We should mark large kmallocs
> as such.  I'll send a patch to do that.

Can you try this?  It should fix the crash, at least.  Not sure why the
frozen patch triggered it.

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 36d283552f80..df9234e5f478 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -925,14 +925,15 @@ FOLIO_FLAG_FALSE(has_hwpoisoned)
 enum pagetype {
 	/* 0x00-0x7f are positive numbers, ie mapcount */
 	/* Reserve 0x80-0xef for mapcount overflow. */
-	PGTY_buddy	= 0xf0,
-	PGTY_offline	= 0xf1,
-	PGTY_table	= 0xf2,
-	PGTY_guard	= 0xf3,
-	PGTY_hugetlb	= 0xf4,
-	PGTY_slab	= 0xf5,
-	PGTY_zsmalloc	= 0xf6,
-	PGTY_unaccepted	= 0xf7,
+	PGTY_buddy		= 0xf0,
+	PGTY_offline		= 0xf1,
+	PGTY_table		= 0xf2,
+	PGTY_guard		= 0xf3,
+	PGTY_hugetlb		= 0xf4,
+	PGTY_slab		= 0xf5,
+	PGTY_zsmalloc		= 0xf6,
+	PGTY_unaccepted		= 0xf7,
+	PGTY_large_kmalloc	= 0xf8,
 
 	PGTY_mapcount_underflow = 0xff
 };
@@ -1075,6 +1076,7 @@ PAGE_TYPE_OPS(Zsmalloc, zsmalloc, zsmalloc)
  * Serialized with zone lock.
  */
 PAGE_TYPE_OPS(Unaccepted, unaccepted, unaccepted)
+FOLIO_TYPE_OPS(large_kmalloc, large_kmalloc)
 
 /**
  * PageHuge - Determine if the page belongs to hugetlbfs
diff --git a/mm/slub.c b/mm/slub.c
index 1f50129dcfb3..872e1bab3bd1 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4241,6 +4241,7 @@ static void *___kmalloc_large_node(size_t size, gfp_t flags, int node)
 		ptr = folio_address(folio);
 		lruvec_stat_mod_folio(folio, NR_SLAB_UNRECLAIMABLE_B,
 				      PAGE_SIZE << order);
+		__folio_set_large_kmalloc(folio);
 	}
 
 	ptr = kasan_kmalloc_large(ptr, size, flags);
@@ -4716,6 +4717,11 @@ static void free_large_kmalloc(struct folio *folio, void *object)
 {
 	unsigned int order = folio_order(folio);
 
+	if (WARN_ON_ONCE(!folio_test_large_kmalloc(folio))) {
+		dump_page(&folio->page, "Not a kmalloc allocation");
+		return;
+	}
+
 	if (WARN_ON_ONCE(order == 0))
 		pr_warn_once("object pointer: 0x%p\n", object);
 
@@ -4725,6 +4731,7 @@ static void free_large_kmalloc(struct folio *folio, void *object)
 
 	lruvec_stat_mod_folio(folio, NR_SLAB_UNRECLAIMABLE_B,
 			      -(PAGE_SIZE << order));
+	__folio_clear_large_kmalloc(folio);
 	folio_put(folio);
 }