linux-kernel - Re: [syzbot] [btrfs?] kernel BUG in folio

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Message-Id: <20240502232247.1845-1-hdanton@sina.com>
Date: Fri,  3 May 2024 07:22:47 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+9e39ac154d8781441e60@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] kernel BUG in folio_unlock (2)

On Thu, 02 May 2024 09:24:30 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    9c6ecb3cb6e2 Add linux-next specific files for 20240502
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10efe5f8980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git  9c6ecb3cb6e2

--- x/fs/btrfs/extent_io.c
+++ y/fs/btrfs/extent_io.c
@@ -1516,7 +1516,8 @@ done:
 					       PAGE_SIZE, !ret);
 		mapping_set_error(page->mapping, ret);
 	}
-	unlock_page(page);
+	if (PageLocked(page))
+		unlock_page(page);
 	ASSERT(ret <= 0);
 	return ret;
 }
--