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Date:      Fri, 18 May 2018 14:13:40 +0100
From:      =?utf-8?Q?Edward_Tomasz_Napiera=C5=82a?= <trasz@FreeBSD.org>
To:        Pratyush Yadav <pratiy0100@gmail.com>
Cc:        FreeBSD-Xen <freebsd-xen@freebsd.org>, Akshay Jaggi <jaggi@freebsd.org>
Subject:   Re: Xen kernel fails to boot, d0v1 triple fault looks like the cuplrit
Message-ID:  <8B64FF6E-78C5-4803-ACE0-D569EA5FDAB2@FreeBSD.org>
In-Reply-To: <CA%2BX=3T%2BYiUmNNPSSA36QmwYsamgAf0hHEsEock-FcomCHc-Jww@mail.gmail.com>
References:  <CA%2BX=3T%2BYiUmNNPSSA36QmwYsamgAf0hHEsEock-FcomCHc-Jww@mail.gmail.com>

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> On 18 May 2018, at 12:59, Pratyush Yadav <pratiy0100@gmail.com> wrote:
>=20
> Hi,
>=20
> So I have been trying to get Xen to boot on my laptop. It is getting
> stuck with the following error messages:
>=20
> (XEN) Scrubbing free RAM on 1 nodes using 4 CPUs
> (XEN) [VT-D] DMAR: [DMA Read} Request device [0000:00:1a.0] fault addr
> 9ce13000. iommu reg - ffff82c000203000
> (XEN) [VT-D] DMAR: reason 06 - PTE read access is not set
> (XEN) ........... done
> (XEN) initial low memory virq threshold set at 0x200 pages.
> (XEN) Std. Loglevel: All
> (XEN) Guest Loglevel: All
> (XEN) Xen is keeping VGA console
> (XEN) Boot video device 00:02.0
> (XEN) ***Serial input -> DOM0 (type 'CTRL-a' three times to switch input t=
o Xen)
> (XEN) Freed 320 kB init memory
> FreeBSD PVH running on xen-3.0-x86_64p
> Copyright (c) 1992-2018 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993,
> 1994 The regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 12.0-CURRENT #0 r333606: Mon May 14 19:59:08 UTC 2018
>    root@releng3.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC a=
md64
> WARNING: WITNESS option enabled, expect reduced performance.
> VT(vga): text 80x25
> CPU: Intel(R) Core(TM) i7-4710HQ CPU @ 2.50GHz (2494.22-MHz K8-class CPU)
>    Origin=3D"GenuineIntel" Id=3D0x306c3 Family=3D0x6 Model=3D0x3c Stepping=
=3D3
>    Features=3D0x17c1cbf5<FPU,DE,TSC,MSR,PAE,MCE.CX8.APIC,SEP,MCA,CMOV,PAT,=
ACPI,MMX
> FXSR,SSE,SSE2,HTT>
>    Features2=3D0xf6f83203<SSE3,PCLMULQDQ,SSSE3,FMA,CX16,SSE4.1,SSE4.2,x2AP=
IC,MOVBE
> POPCNT,AESNI,XSAVE,AVX,F16C,RDRAND,HV>
>    AMD Features=3D0x20101800<SYSCALL,<s12>NX,LM>
>    AMD Features2=3D0x21<<LAHF,ABM>
>    Structured Extended Features=3D0x2329<FSGSBASE,BMI1,AVX2,BMI2,ERMS,NFPU=
SG>
> Hypervisor: Origin =3D "XenVMMXenVMM"
> real memory  =3D 9991770112 (9528 MB)
> avail memory =3D 7936724992 (7569 MB)
> (XEN) d0v1 Triple fault - invoking HVM shutdown action 0
> (XEN) *** Dumping Dom0 vcpu#1 state: ***
> (XEN) ----[ Xen-4.7.2 x86_64 debug=3Dn Not tainted ]----
> (XEN) CPU:    1
> (XEN) RIP:    0020:[<ffffffff8102042b>]
> (XEN) RFLAGS:  0000000000010016    CONTEXT: hvm guest (d0v1)
> (XEN) rax: 0000000000000000   rbx: ffffffff8201c100   rcx: 000000000000000=
1
> (XEN) rdx: 0000000000003078   rsi: ffffffff81b992f8   rdi: fffffe0003bb607=
8
> (XEN) rbp: fffffe00009ffff0   rsp: fffffe00009fffa0   r8: 00000000ffffffff=

> (XEN) r15: 0000000000000400   cr0: 0000000000000011   cr4: 000000000000002=
0
> (XEN) cr3: 00000000035a4000   cr2: 0000000000000ff0
> (XEN) ds: 0028   es: 0028   fs: 0028   gs: 0028   ss: 0028   cs: 0020
> (XEN) Guest stack trace from rsp=3Dfffffe00009fffa0:
> (XEN)   Fault while accessing guest memory.
> (XEN) Hardware Dom0 halted: halting machine
>=20
> Any idea why this is happening and how can I fix this?

First thing I=E2=80=99d try is to checkout an earlier version - eg from thre=
e months ago) and see if it persist.  Another thing to do (in parallel) is t=
o file a PR (http://bugs.freebsd.org).




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