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Date:      Wed, 11 May 2011 17:26:50 -0500
From:      Alan Cox <alan.l.cox@gmail.com>
To:        John Hay <jhay@meraka.org.za>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: MCA: CPU 0 UNCOR PCC DTLB L1 error
Message-ID:  <BANLkTik79gjQKsdrz_8mQdLc3e9KGiGzzQ@mail.gmail.com>
In-Reply-To: <20110510125220.GA88338@zibbi.meraka.csir.co.za>
References:  <20110510125220.GA88338@zibbi.meraka.csir.co.za>

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On Tue, May 10, 2011 at 7:52 AM, John Hay <jhay@meraka.org.za> wrote:

> Hi,
>
> I have seen this panic a few times on a Gigabyte E350N-USB3 running
> 8-STABLE.
> I have only seen it while in X, but then the machine is always in X. At
> first,
> I just got these hangs, so bought a PCI-express RS232 card and could see
> these
> at last. For some reason it does not go past this, so I have not been able
> to
> get a dump yet.
>
> Have anybody an idea of why this is or how to debug it further? I searched
> the archives and found something similar about a year ago, but it looks
> like it was solved with a fix that got committed.
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=140338
>
> I have now disabled mca in loader.conf with 'hw.mca.enabled="0"' and I have
> not seen that panic again. I do occasionally see a panic in devfs_open(),
> but I guess that should be handled in another thread.
>
> The kernel is basically a GENERIC kernel with puc uncommented and the
> following in loader.conf
>
> vm.kmem_size="12G"
> hw.mca.enabled="0"
> zfs_load="YES"
> ahci_load="YES"
> xhci_load="YES"
> amdtemp_load="YES"
> ng_ubt_load="YES"
> uplcom_load="YES"
>
> Here is the panic message and after that dmesg.
>
> John
> --
> John Hay -- jhay@meraka.csir.co.za / jhay@FreeBSD.org
>
> ####################################################
> MCA: Bank 0, Status 0xb600000000010015
> MCA: Global Cap 0x0000000000000106, Status 0x0000000000000004
> MCA: Vendor "AuthenticAMD", ID 0x500f10, APIC ID 0
> MCA: CPU 0 UNCOR PCC DTLB L1 error
> MCA: Address 0x8016c4000
>
>
> Fatal trap 28: machine check trap while in user mode
> cpuid = 0; apic id = 00
> instruction pointer     = 0x43:0x80156af85
> stack pointer           = 0x3b:0x7fffffffcb18
> frame pointer           = 0x3b:0x80fe87800
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                        = DPL 3, pres 1, long 1, def32 0, gran 1
> processor eflags        = interrupt enabled, IOPL = 0
> current process         = 2484 (initial thread)
> trap number             = 28
> panic: machine check trap
> cpuid = 0
> KDB: stack backtrace:
> #0 0xffffffff80608d5e at kdb_backtrace+0x5e
> #1 0xffffffff805d6707 at panic+0x187
> #2 0xffffffff808bf4c0 at trap_fatal+0x290
> #3 0xffffffff808bfaa9 at trap+0x109
> #4 0xffffffff808a7d94 at calltrap+0x8
> ####################################################
>
>
Please try the following patch:

Index: x86/x86/mca.c
===================================================================
--- x86/x86/mca.c       (revision 219060)
+++ x86/x86/mca.c       (working copy)
@@ -665,7 +665,8 @@ mca_setup(uint64_t mcg_cap)
         * for Erratum 383.
         */
        if (cpu_vendor_id == CPU_VENDOR_AMD &&
-           CPUID_TO_FAMILY(cpu_id) == 0x10 && amd10h_L1TP)
+           (CPUID_TO_FAMILY(cpu_id) == 0x10 ||
+           CPUID_TO_FAMILY(cpu_id) == 0x14) && amd10h_L1TP)
                workaround_erratum383 = 1;

        mtx_init(&mca_lock, "mca", NULL, MTX_SPIN);
Index: i386/i386/pmap.c
===================================================================
--- i386/i386/pmap.c    (revision 219060)
+++ i386/i386/pmap.c    (working copy)
@@ -758,7 +758,8 @@ pmap_init(void)
         * machine monitor.
         */
        if (vm_guest == VM_GUEST_VM && cpu_vendor_id == CPU_VENDOR_AMD &&
-           CPUID_TO_FAMILY(cpu_id) == 0x10)
+           (CPUID_TO_FAMILY(cpu_id) == 0x10 ||
+           CPUID_TO_FAMILY(cpu_id) == 0x14))
                workaround_erratum383 = 1;

        /*
Index: amd64/amd64/pmap.c
===================================================================
--- amd64/amd64/pmap.c  (revision 219060)
+++ amd64/amd64/pmap.c  (working copy)
@@ -727,7 +727,8 @@ pmap_init(void)
         * machine monitor.
         */
        if (vm_guest == VM_GUEST_VM && cpu_vendor_id == CPU_VENDOR_AMD &&
-           CPUID_TO_FAMILY(cpu_id) == 0x10)
+           (CPUID_TO_FAMILY(cpu_id) == 0x10 ||
+           CPUID_TO_FAMILY(cpu_id) == 0x14))
                workaround_erratum383 = 1;

        /*



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