linux-kernel - Re: [syzbot] [mm?] BUG: Bad page map (8)

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Message-Id: <20240723103734.1909-1-hdanton@sina.com>
Date: Tue, 23 Jul 2024 18:37:34 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+ec4b7d82bb051330f15a@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] BUG: Bad page map (8)

On Thu, 18 Jul 2024 15:51:26 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    4d145e3f830b Merge tag 'i2c-for-6.10-rc8' of git://git.ker..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1366ab85980000

#syz test upstream  4d145e3f830b

--- x/mm/rmap.c
+++ y/mm/rmap.c
@@ -1466,6 +1466,7 @@ static __always_inline void __folio_add_
 void folio_add_file_rmap_ptes(struct folio *folio, struct page *page,
 		int nr_pages, struct vm_area_struct *vma)
 {
+	BUG_ON(!folio_test_locked(folio));
 	__folio_add_file_rmap(folio, page, nr_pages, vma, RMAP_LEVEL_PTE);
 }
 
--