linux-kernel - Re: [syzbot] [mm?] kernel BUG in free_unref_page

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Message-ID: <20230822172513.GB4509@monkey>
Date:   Tue, 22 Aug 2023 10:25:13 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     syzbot <syzbot+7423f066b632d9ff23d5@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, llvm@...ts.linux.dev, muchun.song@...ux.dev,
        nathan@...nel.org, ndesaulniers@...gle.com,
        syzkaller-bugs@...glegroups.com, trix@...hat.com,
        willy@...radead.org
Subject: Re: [syzbot] [mm?] kernel BUG in free_unref_page_prepare

On 08/22/23 02:39, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    7271b2a53042 Add linux-next specific files for 20230818
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=119dbe4ba80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1936af09cdef7dd6
> dashboard link: https://syzkaller.appspot.com/bug?extid=7423f066b632d9ff23d5
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=112386f3a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15044717a80000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/d81109bc02c1/disk-7271b2a5.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/4b3bf8e2a4f7/vmlinux-7271b2a5.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/6404cd473c1e/bzImage-7271b2a5.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7423f066b632d9ff23d5@...kaller.appspotmail.com

Looks to be caused by Matthew's series "Remove _folio_dtor and _folio_order"
It has already been noted that this series caused issues.

-- 
Mike Kravetz