Date: Thu, 17 Oct 2019 15:53:47 -0400 From: markj@freebsd.org To: Niclas Zeising <zeising+freebsd@daemonic.se> Cc: Neel Chauhan <neel@neelc.org>, Mateusz Guzik <mjguzik@gmail.com>, Evilham <contact@evilham.com>, FreeBSD Current <freebsd-current@freebsd.org>, owner-freebsd-current@freebsd.org Subject: Re: DRM-current-kmod is still a problem at r353339 Message-ID: <20191017195347.GB6447@raichu> In-Reply-To: <3bb2e410-51dd-bc3f-7660-41a4683551b3@daemonic.se> References: <CAGudoHG_aAcqOfSi0GCW5-yw=6RcEXB0dz72mkgdJoz0guJMHA@mail.gmail.com> <7ca3b30a-81f6-f79d-1486-7fd29765646f@acm.org> <CAGudoHE755ig7KGuzq8uNY01K2Jcf-MKBjCp8kbpJAoiHdbQMA@mail.gmail.com> <99c89ca0-462c-f4c7-fa07-6f61e9d39d66@acm.org> <f2e7c4b4c236ee694f277d78479cb6ee@neelc.org> <CAGudoHGwmp=vNwOy2W22rjx_mQj1nkbdYzuLfayM7O0vn4keeA@mail.gmail.com> <bb951f83-6a50-48ce-8efa-b8fa92a9840e@yggdrasil.evilham.com> <CAGudoHGoikyZudFSxYjypF8EL24BPxBTPQjAnCKTe%2Bvg3DJiWQ@mail.gmail.com> <bb4f31fcb7f06059f1d9fe391b119661@neelc.org> <3bb2e410-51dd-bc3f-7660-41a4683551b3@daemonic.se>
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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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