Date: Tue, 22 Sep 2020 18:51:28 -0400 From: Mark Johnston <markj@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: rhurlin@freebsd.org, Hans Petter Selasky <hps@selasky.org>, monochrome <monochrome@twcny.rr.com>, freebsd-current@freebsd.org Subject: Re: Fwd: Re: r365488 page faults on AMD Ryzen 9 3950X Message-ID: <20200922225128.GA10974@raichu> In-Reply-To: <20200921221329.GD2570@kib.kiev.ua> References: <11d27d41-029a-d7f5-eccc-0ba3a3fcfe97@gwdg.de> <b6d7aa27-948a-b820-76b9-1f91a1df0471@selasky.org> <2bbfb4b3-92e9-b3ca-9c31-6c513cee2f2d@gwdg.de> <20200920093814.GD94807@kib.kiev.ua> <0249197f-29f6-4df4-eb63-ca786aaea39d@gwdg.de> <20200920195526.GH94807@kib.kiev.ua> <20200920200735.GJ94807@kib.kiev.ua> <1621df05-35a9-92b9-ffee-d93c17110d87@gwdg.de> <2673660d-3a6e-97c9-82a2-17b5ab8b987b@gwdg.de> <20200921221329.GD2570@kib.kiev.ua>
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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;
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