futex(0x1ffffff81300000) on risc-v -> mm panic

[Palmer Dabbelt]

On Wed, 18 Jun 2025 06:25:59 PDT (-0700), namcao at linutronix.de wrote:
> On Wed, Jun 18, 2025 at 07:10:28AM -0400, rtm at csail.mit.edu wrote:
>> This program on risc-v:
>>
>> main(){
>>   futex((void*) 0x1ffffff81300000, FUTEX_WAIT, 0, 0, 0, 0);
>> }
>>
>> results in:
>>
>> BUG: Bad page state in process a.out  pfn:81500
>
> I cannot reproduce this issue. Can you please share your .config?

It's also not reproducing for me -- or even compiling for that matter, 
but I stuck one that compiles over at 
<https://github.com/palmer-dabbelt/palmer-tests/blob/main/rtm-futex.c> 
(I figured this was a good excuse to start piling up some tests).

> Also, your kernel seems to have some commits on top. Are you sure none of
> those is the reason?

This is on my fixes branch right now, with defconfig + 
CONFIG_DEBUG_VM=y.  So maybe it's one of these patches, or moybe it's 
some other configuration thing?

I'm also running this in QEMU virt, rv64gc, smp=4 (in case that 
matters).  I've got a buildroot-based userspace with glibc.

>
> Best regards,
> Nam
>
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