Re: IO in wrong state on riscv64

On Mon, Oct 13, 2025 at 5:00 PM Alexander Lakhin <exclusion@gmail.com> wrote:
> 13.10.2025 01:44, Thomas Munro wrote:
> > On Sun, Oct 12, 2025 at 6:00 PM Alexander Lakhin <exclusion@gmail.com> wrote:
> >> Please find those attached (gdb "disass/m pgaio_io_update_state" misses
> >> the start of the function (but it's still disassembled below), so I
> >> decided to share the whole output).
> > Could you please also disassemble pgaio_io_reclaim()?
>
> Sure, the output of disass/m pgaio_io_reclaim is attached.

Thanks.  All seems to have something plausible in the right places,
but I know nothing about RISC-V... hmm, what happens if you replace
pg_{read,write}_barrier() with pg_memory_barrier(), in those three
functions?  And if it happens to help, perhaps you could try to figure
out which one(s) help?  Not that it should be necessary but as a clue
or to rule out this line of enquiry... I guess that should generate
FENCE RW,RW, meaning wait for all preceding reads and writes to
complete and don't let any following reads or writes begin, but that's
just from googling...