Fwd: Re: r365488 page faults on AMD Ryzen 9 3950X
Oleg V. Nauman
oleg at theweb.org.ua
Wed Sep 23 13:38:11 UTC 2020
On 2020 M09 23, Wed 01:51:28 EEST Mark Johnston wrote:
> On Tue, Sep 22, 2020 at 01:13:29AM +0300, Konstantin Belousov wrote:
> > On Mon, Sep 21, 2020 at 08:57:46PM +0200, Rainer Hurling wrote:
> > > Fatal trap 12: page fault while in kernel mode
> > > cpuid = 31; apic id = 1f
> > > fault virtual address = 0x25407efa
> >
> > This address is very suspicious.
> >
> > I cannot claim it as the fact, but most likely cause for such garbage
> > pointer value is mismatched ABI between kernel and module. In other
> > words, the module was built against headers from different kernel.
>
> For some reason clang is not complaining about a missing declaration for
> vm_pager_allocate(), despite -Wmissing-prototypes in the CFLAGS...
>
> This patch is required on top of a patched extract of the vbox sources:
>
> --- the-freebsd-kernel.h.orig 2020-09-22 18:49:26.499329000 -0400
> +++ the-freebsd-kernel.h 2020-09-22 18:49:55.317615000 -0400
> @@ -68,6 +68,7 @@
> #include <vm/vm_kern.h>
> #include <vm/vm_param.h> /* KERN_SUCCESS ++ */
> #include <vm/vm_page.h>
> +#include <vm/vm_pager.h>
> #include <vm/vm_phys.h> /* vm_phys_alloc_* */
> #include <vm/vm_extern.h> /* kmem_alloc_attr */
> #include <vm/vm_pageout.h> /* vm_contig_grow_cache */
> --- memobj-r0drv-freebsd.c.orig 2020-09-22 18:49:25.010456000 -0400
> +++ memobj-r0drv-freebsd.c 2020-09-22 18:49:47.462276000 -0400
> @@ -323,7 +323,8 @@
> size_t cPages = atop(pMemFreeBSD->Core.cb);
> int rc;
>
> - pMemFreeBSD->pObject = vm_object_allocate(OBJT_PHYS, cPages);
> + pMemFreeBSD->pObject = vm_pager_allocate(OBJT_PHYS, NULL,
> + pMemFreeBSD->Core.cb, VM_PROT_ALL, 0, curthread->td_ucred);
>
> /* No additional object reference for auto-deallocation upon unmapping.
> */ #if __FreeBSD_version >= 1000055
> @@ -457,7 +458,8 @@
> return VERR_NO_MEMORY;
> }
>
> - pMemFreeBSD->pObject = vm_object_allocate(OBJT_PHYS, atop(cb));
> + pMemFreeBSD->pObject = vm_pager_allocate(OBJT_PHYS, NULL,
> + pMemFreeBSD->Core.cb, VM_PROT_ALL, 0, curthread->td_ucred);
>
> if (PhysHighest != NIL_RTHCPHYS)
> VmPhysAddrHigh = PhysHighest;
This fixed the issue with panic, thank you
More information about the freebsd-current
mailing list