[v10, 00/10] riscv: support kernel-mode Vector

[Palmer Dabbelt]

On Fri, 12 Jan 2024 08:03:24 PST (-0800), andy.chiu at sifive.com wrote:
> On Fri, Jan 12, 2024 at 11:29 PM Björn Töpel <bjorn at kernel.org> wrote:
>>
>> Andy,
>>
>> > Hello:
>> >
>> > This series was applied to riscv/linux.git (for-next)
>> > by Palmer Dabbelt <palmer at rivosinc.com>:
>> >
>>
>> I'm getting some boot issues with this series applied to riscv/for-next.
>>
>> The full runs (with logs) is here:
>> https://github.com/linux-riscv/linux-riscv/actions/runs/7498706326
>>
>> Typically it fails in two ways:
>> Ubuntu rootfs:
>> --8<--
>> [ 4.346414] (sd-gens)[68]: Failed to extract file name from '': Invalid argument
>> [ 4.390832] systemd[1]: Failed to fork off sandboxing environment for executing generators: Protocol error
>> [ESC[0;1;31m!!!!!!ESC[0m] Failed to start up manager.
>> [ 4.440164] systemd[1]: Freezing execution.
>> --8<--
>>
>> or:
>> --8<--
>> [   14.909912] (sd-gens)[71]: Assertion '!strv_isempty(dirs)' failed at src/shared/exec-util.c:211, function execute_directories(). Aborting.
>> [   15.008480] systemd[1]: Failed to fork off sandboxing environment for executing generators: Protocol error
>> [ESC[0;1;31m!!!!!!ESC[0m] Failed to start up manager.
>> [   15.111989] systemd[1]: Freezing execution.
>> --8<--
>>
>> and Alpine with:
>> --8<--
>> [ 0.036703] Kernel panic - not syncing: kmem_cache_create_usercopy: Failed to create slab 'riscv_vector_ctx'. Error -22
>> [ 0.039195] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.7.0-rc1-defconfig_plain-gdf944704182e #1
>> [ 0.040744] Hardware name: riscv-virtio,qemu (DT)
>> [ 0.041975] Call Trace:
>> [ 0.042813] [<ffffffff800067a4>] dump_backtrace+0x1c/0x24
>> [ 0.044832] [<ffffffff80945980>] show_stack+0x2c/0x38
>> [ 0.045724] [<ffffffff80952214>] dump_stack_lvl+0x3c/0x54
>> [ 0.046841] [<ffffffff80952240>] dump_stack+0x14/0x1c
>> [ 0.047428] [<ffffffff80945e7c>] panic+0x106/0x29e
>> [ 0.047998] [<ffffffff8015f14c>] kmem_cache_create_usercopy+0x20e/0x258
>> [ 0.048786] [<ffffffff80a044dc>] riscv_v_setup_ctx_cache+0x2c/0x3c
>> [ 0.049521] [<ffffffff80a03a48>] arch_task_cache_init+0x10/0x18
>> [ 0.057832] [<ffffffff80a0706c>] fork_init+0x42/0x168
>> [ 0.058737] [<ffffffff80a00d70>] start_kernel+0x6ba/0x73a
>> --8<--
>>
>> The Alpine boot can be fixed with something like:
>> --8<--
>> diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c
>> index f9769703fd39..0ac79a9cdba5 100644
>> --- a/arch/riscv/kernel/vector.c
>> +++ b/arch/riscv/kernel/vector.c
>> @@ -53,6 +53,9 @@ int riscv_v_setup_vsize(void)
>>
>>  void __init riscv_v_setup_ctx_cache(void)
>>  {
>> +       if (!riscv_v_vsize)
>> +               return;
>> +
>>         riscv_v_user_cachep = kmem_cache_create_usercopy("riscv_vector_ctx",
>>                                                          riscv_v_vsize, 16, SLAB_PANIC,
>>                                                          0, riscv_v_vsize, NULL);
>> --8<--
>
> Sorry for that! I forgot to do a has_vector() check before creating
> the cache. I am going to send a patch to fix it.

They don't fail for me either, which is how they ended up on for-next.  
So sorry I missed it.

Do you have a fix?  Otherwise I can just drop these from for-next and we 
can do a v11 -- it's the tip of for-next, so still pretty easy ta back 
out.

>
>>
>> but with this "fix" in place I still get Ubuntu boot failures. To
>> reproduce the CI locally:
>>
>>   | git fetch https://github.com/linux-riscv/linux-riscv e2aad75b340d65b0be4d1a689db3e10c6ed3f18e
>>   | git checkout FETCH_HEAD
>>   | docker pull ghcr.io/linux-riscv/pw-builder-multi:latest
>>   | docker run -it --volume $PWD:/build/my-linux ghcr.io/linux-riscv/pw-builder-multi:latest bash
>>   | # In container
>>   | bash -l
>>   | mkdir -p /build/kernels/logs
>>   | .github/scripts/series/prepare_tests.sh
>>   | cd /build/my-linux
>>   | .github/scripts/series/kernel_builder.sh rv64 defconfig plain gcc
>>   | .github/scripts/series/test_runner.sh rv64 defconfig plain gcc ubuntu
>>   | .github/scripts/series/test_runner.sh rv64 defconfig plain gcc alpine
>
> It's weird that these errors do not show up in my test environment. I
> will try to reproduce it with the script above.
>
>>
>> Logs in /build/tests/run_test*
>>
>> I'll continue to debug in the meantime.
>>
>>
>> Björn
>
> Thanks,
> Andy
>
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