Re: [Xen-devel] KDB in Xen 4.4

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 2 Jun 2014 22:39:01 +0000
"Aravindh Puthiyaparambil (aravindp)" <aravindp@xxxxxxxxx> wrote:

> >I applied your patches to xen 4.4.0 source, It can be applied without
> >errors, and built OK. I install it in ubuntu 12.04. After I reboot
> >the system, it has a fatal error, and system cannot boot. I put the
> >serial console log below. Do you have any ideas about what causes
> >this problem? any
> >suggestions will be appreciated. Thank you.
...
> >[    0.000000] Booting paravirtualized kernel on Xen
> >xen_force_evtchn_callback+0xd/0x10 [    0.000000]
> >[<ffffffff81666a6b>] invalid_op+0x1b/0x20 [    0.000000]
> >[<ffffffff8101d81c>] ? xstate_enable+0x3c/0x50 [    0.000000]
> >[<ffffffff8101d80c>] ? xstate_enable+0x2c/0x50 [    0.000000]
> >[<ffffffff81d0474c>] xstate_enable_boot_cpu+0xa9/0x174
> >[    0.000000]  [<ffffffff81635a17>] xsave_init+0x26/0x28
> >[    0.000000]  [<ffffffff81637cdd>] cpu_init+0x2bb/0x2d8
> >[    0.000000]  [<ffffffff81d00f49>] trap_init+0x169/0x171
> >[    0.000000]  [<ffffffff81cfba28>] start_kernel+0x1d5/0x3c7
> >[    0.000000]  [<ffffffff81cfb388>]
> >x86_64_start_reservations+0x132/0x136 [    0.000000]
> >[<ffffffff81cfef06>] xen_start_kernel+0x5bc/0x5c3 *** kdb (Fatal
> >Error on cpu:0 vec:1  ????? ): ffff82d080223a0f:
> >kdb_trap_immed+3f              lea 0x6058e(%rip), %rdi [0]xkdb>
> 
> I don't think this has anything to do with the KDB patch. You might
> be running in to this issue:
> http://lists.xenproject.org/archives/html/xen-devel/2012-05/msg00080.html
> 
> Please try running with the xsave=0 kernel command line option or
> upgrade your kernel.

Thanks Aravindh. Xin, kdb is working fine as you can see it broke into
the debugger upon panic:

> >kdb_trap_immed+3f              lea 0x6058e(%rip), %rdi [0]xkdb>
[0]xkdb>  

At this point you can run kdb commands to get more info. 

Mukesh



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