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Message-ID: <CACT4Y+YJmVWFEhdWCtF391EM6qN5OBGTBFLuK4tLL61RiQr+MQ@mail.gmail.com>
Date:   Wed, 22 Jan 2020 15:24:27 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+dc92421ed22129134c0f@...kaller.appspotmail.com>,
        steven.price@....com, Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: linux-next build error (7)

On Wed, Jan 22, 2020 at 2:17 PM syzbot
<syzbot+dc92421ed22129134c0f@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    ba0b4dfd Add linux-next specific files for 20200122
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=17caa985e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7b604c617a6b217c
> dashboard link: https://syzkaller.appspot.com/bug?extid=dc92421ed22129134c0f
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+dc92421ed22129134c0f@...kaller.appspotmail.com
>
> /syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:560: undefined reference to `__efi64_thunk'
> /syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:902: undefined reference to `efi_uv1_memmap_phys_prolog'
> /syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:921: undefined reference to `efi_uv1_memmap_phys_epilog'

There are 2 recent commits in linux-next touching this file:

commit 6616face70e25c80420539075a943ac1bc9b990c
Date:   Wed Jan 22 09:12:37 2020 +1100
    x86: mm+efi: convert ptdump_walk_pgd_level() to take a mm_struct

commit 3cc028619e284188cdde652631e1c3c5a83692b9
Date:   Sat Jan 18 17:57:03 2020 +0100
    efi/x86: avoid KASAN false positives when accessing the 1: 1 mapping

Not sure which one is this. But linux-next is build broken.

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