Re: Linux crash when using FTDI FT232R USB to serial converter on AMD boards.

Oliver Neukum
2019-05-15T10:48:51Z

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On Mi, 2019-05-15 at 11:43 +0200, StarostaCZ@gmail.com wrote:
> As I wrote, I made new test on kernel Linux version
> 5.1.0-050100-generic amd64:
>
> https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1/
>
> Same problem, system crash after a few seconds. Full kern.log: https://paste.ee/p/EmLsw

Most helpful. First, try to replicate this with the iommu disabled.
Secondly, make a proper bugreport mentioning the affected kernel version (5.1)
Thirdly, if possible replicate this with the vanilla kernel from kernel.org

>
>
> Unfortunately, I can't judge if the patch is there, but
> I found, that this patch was added to kernel 5.0.2:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/iommu/amd_iommu.c?id=4e50ce03976fbc8ae995a000c4b10c737467beaa
>
> Can I somehow
> verify that the patch is in this ubuntu kernel 5.1.0?

You would need to look into the kernel source, but this is not necessary.
Joerg's guess was incorrect.

Regards
Oliver

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