On 4/7/20 5:36 PM, Alex Xu (Hello71) wrote:
Excerpts from Thomas Hellström (VMware)'s message of April 7, 2020 7:26 am:
On 4/7/20 2:38 AM, Alex Xu (Hello71) wrote:
Excerpts from Thomas Hellström (VMware)'s message of April 6, 2020 5:04 pm:
Hi,
On 4/6/20 9:51 PM, Alex Xu (Hello71) wrote:
Using 314b658 with amdgpu, starting sway and firefox causes "BUG: Bad
rss-counter state" and "BUG: non-zero pgtables_bytes on freeing mm" to
start filling dmesg, and then closing programs causes more BUGs and
hangs, and then everything grinds to a halt (can't start more programs,
can't even reboot through systemd).
Using master and reverting that branch up to that point fixes the
problem.
I'm using a Ryzen 1600 and AMD Radeon RX 480 on an ASRock B450 Pro4
board with IOMMU enabled.
If you could try the attached patch, that'd be great!
Thanks,
Thomas
Yeah, that works too. Kernel config sent off-list.
Regards,
Alex.
Thanks. Do you want me to add your
Reported-by: and Tested-by: To this patch?
/Thomas
Sure. Shouldn't we fix it properly though?
It's still enabled for vmwgfx for which it is reasonably well tested and
where I can't see any such errors.
The code we remove with this patch enables huge page-table entries in
some circumstances for other drivers, but given the problems you're
seeing for amdgpu, it's better to enable this on a per-driver basis
after thorough testing. Since I don't have amdgpu hardware I'm not sure
what it's doing differently, and can't debug the issue properly.
/Thomas
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