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Date:   Mon, 10 Oct 2022 20:57:00 -0600
From:   "Jason A. Donenfeld" <Jason@zx2c4.com>
To:     Michael Ellerman <mpe@ellerman.id.au>
Cc:     Andrew Donnellan <ajd@linux.ibm.com>, rmclure@linux.ibm.com,
        Linus Torvalds <torvalds@linux-foundation.org>,
        aneesh.kumar@linux.ibm.com, atrajeev@linux.vnet.ibm.com,
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Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag
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On Tue, Oct 11, 2022 at 12:44:20PM +1100, Michael Ellerman wrote:
> "Jason A. Donenfeld" <Jason@zx2c4.com> writes:
> > Hi Andrew,
> >
> > On Tue, Oct 11, 2022 at 11:00:15AM +1100, Andrew Donnellan wrote:
> >> Thanks for bisecting, this is interesting! Could you provide your
> >> .config and the environment you're running in? Your reproducer doesn't
> >> seem to trigger it on my baremetal POWER8 pseries_le_defconfig.
> >
> > Sure.
> >
> > .config: https://xn--4db.cc/NemFt2Vs (change CONFIG_INITRAMFS_SOURCE)
> > Toolchain: https://download.wireguard.com/qemu-test/toolchains/20211123/powerpc-linux-musl-cross.tgz
> >
> > You can also just run:
> >
> >   ARCH=powerpc make -C tools/testing/selftests/wireguard/qemu -j$(nproc)
> >
> > And that'll assemble the whole thing.
> 
> I tried that :)
> 
> What host OS are you running that on?
> 
> I get:
> 
>   mkdir -p /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc
>   powerpc-linux-musl-gcc -o /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc/init -O3 -pipe  -std=gnu11 init.c
>   /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc/powerpc-linux-musl-cross/bin/../lib/gcc/powerpc-linux-musl/11.2.1/../../../../powerpc-linux-musl/bin/ld: cannot find Scrt1.o: No such file or directory
>   /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc/powerpc-linux-musl-cross/bin/../lib/gcc/powerpc-linux-musl/11.2.1/../../../../powerpc-linux-musl/bin/ld: cannot find crti.o: No such file or directory
>   /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc/powerpc-linux-musl-cross/bin/../lib/gcc/powerpc-linux-musl/11.2.1/../../../../powerpc-linux-musl/bin/ld: cannot find crtbeginS.o: No such file or directory
>   /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc/powerpc-linux-musl-cross/bin/../lib/gcc/powerpc-linux-musl/11.2.1/../../../../powerpc-linux-musl/bin/ld: cannot find -lgcc
>   /scratch/michael/linus/tools/testing/selftests/wireguard/qemu/build/powerpc/powerpc-linux-musl-cross/bin/../lib/gcc/powerpc-linux-musl/11.2.1/../../../../powerpc-linux-musl/bin/ld: cannot find -lgcc
>   collect2: error: ld returned 1 exit status

Here's what happened:

- You started the thing and the kernel compile complained about an
  unclean tree.
- You ran mrproper.
- You tried to run the thing again.

amirite?

If so, what happened is that mrproper deleted the .o files from the
toolchain. Solution:

  ARCH=powerpc make -C tools/testing/selftests/wireguard/qemu -j$(nproc) clean
  ARCH=powerpc make -C tools/testing/selftests/wireguard/qemu -j$(nproc)

Let me know how that goes.

Jason