linux-kernel - Re: [syzbot] [ext4?] WARNING: locking bug in get_page_from

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Message-Id: <20241125105220.1566-1-hdanton@sina.com>
Date: Mon, 25 Nov 2024 18:52:20 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+5abecb17ba9299033d79@...kaller.appspotmail.com>
Cc: adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	tytso@....edu
Subject: Re: [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist

On Sun, 24 Nov 2024 18:49:19 -0800
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=177ab75f980000

Test the idea [1]
[1] https://lore.kernel.org/lkml/20241122155451.Mb2pmeyJ@linutronix.de/

#syz test

--- x/mm/kasan/generic.c
+++ y/mm/kasan/generic.c
@@ -538,7 +538,7 @@ static void __kasan_record_aux_stack(voi
 		return;
 
 	alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
-	alloc_meta->aux_stack[0] = kasan_save_stack(0, depot_flags);
+	alloc_meta->aux_stack[0] = kasan_save_stack(0, 0);
 }
 
 void kasan_record_aux_stack(void *addr)
--