On Thu, Oct 17, 2019 at 03:03:51PM +0200, Niclas Zeising wrote:
> On 2019-10-16 18:57, Neel Chauhan wrote:
> > While drm-current-kmod worked for a little while, it broke with r353645.
> >
> > https://i.imgur.com/Q5nYZf2.jpg
> >
> > I'm using the same HP Spectre that I used earlier (where it worked and
> > where it panicked).
> >
>
> That commit looks unrelated, it touches the wbwd and superio drivers,
> nothing else. Any chance you can bisect exactly which revision that
> caused the new issues?
I believe it was the recent work on the vm page busy state, r353539
specifically. This patch should fix it; we don't yet have a
__FreeBSD_version number bump on which to gate the patch.
diff --git a/linuxkpi/gplv2/src/linux_page.c b/linuxkpi/gplv2/src/linux_page.c
index e2b85c45c..060ae85ed 100644
--- a/linuxkpi/gplv2/src/linux_page.c
+++ b/linuxkpi/gplv2/src/linux_page.c
@@ -239,7 +239,7 @@ retry:
page = vm_page_lookup(devobj, i);
if (page == NULL)
continue;
- if (vm_page_sleep_if_busy(page, "linuxkpi"))
+ if (!vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL))
goto retry;
cdev_pager_free_page(devobj, page);
}
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