Bug report: cpu_relax call from vdso space

[Jisheng Zhang]

On Sat, Oct 15, 2022 at 10:08:55AM +0300, Denis Ivanov wrote:
> Hello,
> 
> Segmentation fault may be raised from cpu_relax()
> (arch/riscv/include/asm/vdso/processor.h).
> 
> cpu_relax() may be called from vDSO functions (ex: __vdso_clock_gettime).
> This means that global 'riscv_isa_ext_keys' variable must not be used in
> cpu_relax() directly.

Hi,

Could you please share how to reproduce the Segment fault with
cpu_relax()? 

Thanks

> 
> Use of this array was added to cpu_relax() in
> https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/?h=fixes&id=8eb060e10185cfc97ef0200d197ec246ba0f9f8c
> 
> Denis Ivanov
> 
> 
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