Re: zswap_writeback_entry crashes in 6.9.5

[Nhat Pham <nphamcs@gmail.com>]

On Fri, Jul 19, 2024 at 11:57 AM Pedro Falcato <pedro.falcato@gmail.com> wrote:
>
> On Mon, Jul 1, 2024 at 2:07 AM Nhat Pham <nphamcs@gmail.com> wrote:
> >
> > On Sun, Jun 30, 2024 at 10:58 AM Pedro Falcato <pedro.falcato@gmail.com> wrote:
> > >
> > > Hi everyone,
> >
> > Hi Pedro,
> >
>
> I have a separate theory. I also run the NVIDIA proprietary drivers.
> slabinfo -a shows us:
> [...]
> :0000080     <- zswap_entry Acpi-Parse kernfs_iattrs_cache
> uvm_tools_replay_data_t Acpi-State audit_tree_mark
> [...]
>
> See the uvm_tools_replay_data_t there? Yeah, it's entirely possible
> some random nvidia.ko bug has been corrupting zswap_entry from time to
> time (which explains why e.g the big server people have not seen
> this).

Oh this is fascinating. I would never have guessed this. Thanks for
doing the investigation!

> I'm not sure if Yuxuan is running the same driver, but their kernel is
> also proprietary-tainted.
>
> As such I'll refrain from posting more about this or similar bugs
> until I can get a guarantee it happens with a non-tainted kernel
> (fwiw, I have not seen crashes for 2 weeks or so, hopefully this issue
> is fixed).

Crossing my fingers :)

>
> Again, sorry for not checking the taint before posting this, and thank
> you for your time :)

No worries at all :) Let me know if there are new developments
regarding this issue, or if you are able to confirm one way or another
:)