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

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Message-ID: <000000000000d5052e06044cced1@google.com>
Date:   Fri, 01 Sep 2023 07:16:34 -0700
From:   syzbot <syzbot+7423f066b632d9ff23d5@...kaller.appspotmail.com>
To:     42.hyeyoo@...il.com, akpm@...ux-foundation.org, bhe@...hat.com,
        dyoung@...hat.com, hughd@...gle.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        llvm@...ts.linux.dev, lrh2000@....edu.cn, mike.kravetz@...cle.com,
        muchun.song@...ux.dev, nathan@...nel.org, ndesaulniers@...gle.com,
        pcc@...gle.com, syzkaller-bugs@...glegroups.com, trix@...hat.com,
        vgoyal@...hat.com, willy@...radead.org
Subject: Re: [syzbot] [mm?] kernel BUG in free_unref_page_prepare

syzbot has bisected this issue to:

commit 3a77b282e256d880791a4c5aa10ede13d6417425
Author: Matthew Wilcox (Oracle) <willy@...radead.org>
Date:   Wed Aug 16 15:11:58 2023 +0000

    mm: free up a word in the first tail page

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13297387a80000
start commit:   7271b2a53042 Add linux-next specific files for 20230818
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10a97387a80000
console output: https://syzkaller.appspot.com/x/log.txt?x=17297387a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1936af09cdef7dd6
dashboard link: https://syzkaller.appspot.com/bug?extid=7423f066b632d9ff23d5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=112386f3a80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15044717a80000

Reported-by: syzbot+7423f066b632d9ff23d5@...kaller.appspotmail.com
Fixes: 3a77b282e256 ("mm: free up a word in the first tail page")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection