linux-next build error (7)

[syzbot]

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+dc9242...@syzkaller.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'

---
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[Dmitry Vyukov]

On Wed, Jan 22, 2020 at 2:17 PM syzbot
<syzbot+dc9242...@syzkaller.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+dc9242...@syzkaller.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.

[Ard Biesheuvel]

Does this help?

https://lore.kernel.org/linux-efi/2020012109391...@kernel.org/

[Eric Biggers]

Presumably fixed by commit ac6119e7f25b
(https://git.kernel.org/torvalds/c/ac6119e7f25b):

#syz fix: efi/x86: Disable instrumentation in the EFI runtime handling code