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Message-Id: <20240409164627.b4803e09c81c01ccb6f55601@linux-foundation.org>
Date: Tue, 9 Apr 2024 16:46:27 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: syzbot <syzbot+57adb2a4b9d206521bc2@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] general protection fault in
hpage_collapse_scan_file
On Tue, 09 Apr 2024 03:16:20 -0700 syzbot <syzbot+57adb2a4b9d206521bc2@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 8568bb2ccc27 Add linux-next specific files for 20240405
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=152f4805180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=48ca5acf8d2eb3bc
> dashboard link: https://syzkaller.appspot.com/bug?extid=57adb2a4b9d206521bc2
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1268258d180000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1256598d180000
Help. From a quick look this seems to be claiming that collapse_file()
got to
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
with folio==NULL, but the code look solid regarding this.
Given that we have a reproducer, can we expect the bot to perform a
bisection for us?
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