Re: Reboot on *DOM0* while/after installing GPLPV drivers

[Takahiro HAYASHI <t-hash%abox3.so-net.ne.jp@localhost>]

hello,

On Sun, 06 Oct 2013 18:13:04 +0900 I wrote:

> The build date of kernel is Sep 19 00:16:55 UTC 2013 and
> src has been checked out on Sep 18 21:34:46 UTC 2013.
> Sorry.
> 
> On Sun, 6 Oct 2013 10:31:05 +0200
> Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
> 
> > > XEN console said:
> > > [...]
> > > (XEN) domain_crash_sync called from entry.S
> > > (XEN) Domain 0 (vcpu#0) crashed on cpu#0:
> > > (XEN) ----[ Xen-4.2.3  x86_64  debug=y  Not tainted ]----
> > > (XEN) CPU:    0
> > > (XEN) RIP:    e033:[<ffffffff802b014a>]
> > > (XEN) RFLAGS: 0000000000010282   EM: 0   CONTEXT: pv guest
> > > (XEN) rax: 0000000000000000   rbx: 0000000000000000   rcx: 
> > > 0000000000000000
> > > (XEN) rdx: 0000000000000000   rsi: ffffffff803eea98   rdi: 
> > > 0000a0011f879c20
> > > (XEN) rbp: ffffa000191a8a50   rsp: ffffa000191a89f0   r8:  
> > > fffffffffffffffc
> > > (XEN) r9:  0000000000028004   r10: 0000000000000000   r11: 
> > > 0000000000000000
> > > (XEN) r12: 0000000000000000   r13: ffffa000191a8a98   r14: 
> > > ffffffff805f4c40
> > > (XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 
> > > 00000000000426f0
> > > (XEN) cr3: 000000013b916000   cr2: ffffa000191a8a98
> > > (XEN) ds: 0017   es: 0017   fs: 0000   gs: 0000   ss: e02b   cs: e033
> > > (XEN) Guest stack trace from rsp=ffffa000191a89f0:
> > > (XEN)   Fault while accessing guest memory.
> > > (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
> > > (XEN) Resetting with ACPI MEMORY or I/O RESET_REG.
> > 
> > Could you see where ffffffff802b014a is in your dom0 kenrel ?
> 
> pmap_extract + 0x112

I'm not well-informed about x86 asm, but I did objdump -d pmap.o
in objdir and cc -gS pmap.c.
(pmap.o is from src/sys/arch/x86/x86/pmap.c rev 1.164.2.4)

pmap_extract+0x112 is located on line 2935 of pmap.c.

pmap.s sez:

.LBE1556:
        .loc 1 2934 0
        testq   %r13, %r13
        je      .L487
        .loc 1 2935 0
        movq    %rdx, 0(%r13)
.L487:
        .loc 1 2938 0

pmap.c is:

   2933         KPREEMPT_ENABLE(l);
   2934         if (pap != NULL) {
   2935                 *pap = pa;
   2936         }
   2937         return rv;
   2938 }

Does this help?

--
t-hash