AARCH64 CONFIG_CPU_BIG_ENDIAN=y doesn't boot fully

[nickdesaulniers]

$ qemu-system-aarch64 -kernel arch/arm64/boot/Image.gz -machine virt -cpu cortex-a57 -nographic --append "console=ttyAMA0" -m 2048
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x411fd070]
[    0.000000] Linux version 5.3.0-rc3-00016-g0eb0ce0a78e1 (ndesaulniers@ndesaulniers1.mtv.corp.google.com) (clang version 10.0.0 (https://github.com/llvm/llvm-project.git 5bf16ec02b82c0e2502308c0ba36810b303ead0f)) #109 SMP PREEMPT Tue Aug 6 11:38:10 PDT 2019
...
[    0.454815] kvm [1]: HYP mode not available
[    0.732776] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module binfmt-4c46, throttling...
[    5.882267] request_module: modprobe binfmt-4c46 cannot be processed, kmod busy with 50 threads for more than 5 seconds now

Seems like the kernel is getting caught in some loop.

KernelCI reported this as it's adding noise to their boot tests.

[nathanchance]

This appears to be invalid according to the thread:

https://lore.kernel.org/linux-arm-kernel/ec7bef46-7dcf-d165-b772-b4fd6055d964@arm.com/

I can confirm that a CONFIG_CPU_BIG_ENDIAN kernel boots with their rootfs:

$ qemu-system-aarch64 -m 512m -cpu cortex-a57 -initrd rootfs.cpio -append console=ttyAMA0 -display none -serial mon:stdio -kernel /mnt/build/kernel/arch/arm64/boot/Image.gz -machine virt
...
linaro-test [rc=0]# zcat /proc/config.gz | grep BIG_ENDIAN
CONFIG_CPU_BIG_ENDIAN=y
linaro-test [rc=0]# cat /proc/version
Linux version 5.3.0-rc3-cbl-00308-g4e2cf66ab38a-dirty (nathan@archlinux-threadripper) (ClangBuiltLinux clang version 10.0.0 (git://github.com/llvm/llvm-project 4e72b1524944c4a03a49b6b02233fdc8417542f7) (based on LLVM 10.0.0svn)) #1 SMP PREEMPT Wed Aug 7 10:19:49 MST 2019

kernelci/kernelci-core#136