Messages in this thread | | | Date | Mon, 2 Nov 2020 00:29:00 -0700 | From | Nathan Chancellor <> | Subject | Hard lockup on Raspberry Pi 4 after v5.10-rc1 |
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Hi everyone,
Starting with v5.10-rc1, I appear to be experiencing hard lockups on my Raspberry Pi 4 when compiling LLVM. My standard workflow for testing the Raspberry Pi 4 has been compiling tip of tree LLVM (to catch host AArch64 issues), compiling linux-next ARCH=arm64 defconfig, then booting it with QEMU + KVM, which has caught a few issues so far. Starting with v5.10-rc1, compiling LLVM causes the serial console to print junk like
|▒pp▒p▒p▒p p|▒|▒|p▒p▒p|▒▒|▒|▒|p|▒▒|▒|▒| p▒pp▒▒▒|▒▒ ▒ ▒|▒|▒▒▒▒ p▒ ▒ ▒▒ ▒ ▒p|p
then I lose my mosh connection and I see the lights on the front of the Pi stop blinking.
I have managed to narrow it down to a commit somewhere in the armsoc DT merge.
Good: 2e368dd2bbea ("Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc") Bad: e533cda12d8f ("Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc")
I have not been able to complete a full bisect due to a lack of time unfortunately, I am sending this email to hopefully get some more eyes on the issue.
$ head -n6 /boot/config.txt # My settings enable_uart=1 core_freq_min=500 kernel=Image os_prefix=custom-mainline-gcc-arm64/ upstream_kernel=1
$ cat /boot/.firmware_revision e8ddac7cd34b179efd702d4dc1efd0ccf44559b9
I can reproduce the issue with:
$ git clone --depth=1 https://github.com/llvm/llvm-project
$ mkdir -p llvm-project/build && cd llvm-project/build
$ cmake \ -G Ninja \ -DCMAKE_BUILD_TYPE=Release \ -DLLVM_ENABLE_PROJECTS="clang;lld" \ ../llvm && ninja
If you need any more information or testing, please let me know!
Cheers, Nathan
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