linux-kernel - Re: kernel BUG in memory_bm

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Message-ID: <20210315120943.GB22897@arm.com>
Date:   Mon, 15 Mar 2021 12:09:44 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+5ecbe63baca437585bd4@...kaller.appspotmail.com>,
        Len Brown <len.brown@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Pavel Machek <pavel@....cz>
Subject: Re: kernel BUG in memory_bm_free

On Mon, Mar 15, 2021 at 08:08:06AM +0100, Dmitry Vyukov wrote:
> On Wed, Feb 3, 2021 at 6:59 AM syzbot
> <syzbot+5ecbe63baca437585bd4@...kaller.appspotmail.com> wrote:
> > syzbot found the following issue on:
> >
> > HEAD commit:    3aaf0a27 Merge tag 'clang-format-for-linux-v5.11-rc7' of g..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17ef6108d00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=10152c2ea16351e7
> > dashboard link: https://syzkaller.appspot.com/bug?extid=5ecbe63baca437585bd4
> > userspace arch: arm64
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+5ecbe63baca437585bd4@...kaller.appspotmail.com
> 
> The BUG is:
> BUG_ON(!virt_addr_valid(addr));
> 
> #syz fix: arm64: Do not pass tagged addresses to __is_lm_address()

Does this mean that commit 91cb2c8b072e ("arm64: Do not pass tagged
addresses to __is_lm_address()") fixes the regression? The patch was
merged in -5.11-rc7 I think.

-- 
Catalin