Hi Geert,
On Fri, Aug 7, 2020 at 9:05 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Prabhakar,
>
> On Thu, Aug 6, 2020 at 7:01 PM Lad, Prabhakar
> <prabhakar.csengg@xxxxxxxxx> wrote:
> > During adding support for SATA on RZ/G2H, I was trying some stress
>
> RZ/G2N, according to the logs?
>
> > testing on the stock 5.8.0 kernel.
> >
> > $ dd if=/dev/urandom of="${TMP_DIR}/random-data" bs=1M count=1000 # Works OK
> > $ time bonnie++ -d "${MNT_DIR}" -u root # Worked OK, as Biju pointed
> > out earlier he had seen an issue with this and disabling
> > CONFIG_PROVE_LOCKING fixes it.
> > $ for i in {1..50}; do echo $i;cp random-data random-data-$i;sync;
> > done # This is where I saw random kernel panics/EXT4 errors
> >
> > To prove it out it's not the SATA I switched to USB3 and kept on
> > seeing similar issues. To make sure if the device is OK I tested the
> > devices on VLP1.0.4 release and saw no such behaviour.
> >
> > I have been using renesas_defconfig + enabled modules + added USB3
> > firmware file
> > * Tried disabling cma (cma=0 in bootargs)
> > * Before mounting the device made sure I run e2fsck
> > * Also ran badblocks tool on the device and saw no issues
> > * Disabled CONFIG_HUGETLBFS/CONFIG_ZONE_DMA32
> >
> > I also tested on R-car M3N with renesas_defconfig and saw no issues
> > with USB ext4.
>
> I assume you can run the same kernel on R-Car M3-N and RZ/G2N, if you
> enable support for both SoCs. Does that show the problem on both?
>
Yes I did use the same kernel on bot the platforms.
> > Any thoughts on what could be causing this issue. (I will start
> > comparing the VLP kernel)
>
> What's the VLP kernel?
>
Eventually you found it out :)
> If you have two kernels, one that works, and one that doesn't, you can
> bisect the issue. Might be not so simple, if the two versions have
> diverged, but you can always try rebasing the newest tree on top of the
> oldest one, and run git bisect on that.
>
> Your log for M3-N doesn't show the firmware boot log, but your RZ/G2N
> board has "Lossy Decomp areas". My R-Car M3-N Salvator-XS doesn't
> have those. Also, there may be a difference in the QoS settings.
>
> Good luck finding the cause!
>
Using the latest e2fsprogs tools [1] I am no more seeing any kernel
panics now. Sorry for the noise.
[1] https://mirrors.edge.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/v1.45.6/
Cheers,
--Prabhakar
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
