[merged mm-hotfixes-stable] mm-dont-spin-in-add_stack_record-when-gfp-flags-dont-allow.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-dont-spin-in-add_stack_record-when-gfp-flags-dont-allow.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: don't spin in add_stack_record when gfp flags don't allow
has been removed from the -mm tree.  Its filename was
     mm-dont-spin-in-add_stack_record-when-gfp-flags-dont-allow.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Alexei Starovoitov <ast@kernel.org>
Subject: mm: don't spin in add_stack_record when gfp flags don't allow
Date: Thu, 9 Oct 2025 17:15:13 -0700

syzbot was able to find the following path:
  add_stack_record_to_list mm/page_owner.c:182 [inline]
  inc_stack_record_count mm/page_owner.c:214 [inline]
  __set_page_owner+0x2c3/0x4a0 mm/page_owner.c:333
  set_page_owner include/linux/page_owner.h:32 [inline]
  post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
  prep_new_page mm/page_alloc.c:1859 [inline]
  get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
  alloc_pages_nolock_noprof+0x94/0x120 mm/page_alloc.c:7554

Don't spin in add_stack_record_to_list() when it is called
from *_nolock() context.

Link: https://lkml.kernel.org/r/CAADnVQK_8bNYEA7TJYgwTYR57=TTFagsvRxp62pFzS_z129eTg@mail.gmail.com
Fixes: 97769a53f117 ("mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reported-by: syzbot+8259e1d0e3ae8ed0c490@syzkaller.appspotmail.com
Reported-by: syzbot+665739f456b28f32b23d@syzkaller.appspotmail.com
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_owner.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/page_owner.c~mm-dont-spin-in-add_stack_record-when-gfp-flags-dont-allow
+++ a/mm/page_owner.c
@@ -168,6 +168,9 @@ static void add_stack_record_to_list(str
 	unsigned long flags;
 	struct stack *stack;
 
+	if (!gfpflags_allow_spinning(gfp_mask))
+		return;
+
 	set_current_in_page_owner();
 	stack = kmalloc(sizeof(*stack), gfp_nested_mask(gfp_mask));
 	if (!stack) {
_

Patches currently in -mm which might be from ast@kernel.org are