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[Xen-devel] Re: 2.6.26-rc8 pv_ops causes Unhandled invalid opcode fault/

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: 2.6.26-rc8 pv_ops causes Unhandled invalid opcode fault/trap
From: "Christopher S. Aker" <caker@xxxxxxxxxxxx>
Date: Thu, 03 Jul 2008 14:24:58 -0400
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
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Jeremy Fitzhardinge wrote:
Were there any other errors/warnings printed here?

Nope.  Just some whitespace.

Are you sure? Could you send a full xm dmesg log output? The crash is from a BUG() caused by a failing hypercall. Since you have compiled Xen with debug enabled, it should have printed something about why it was failing the hypercall.

Unfortunately, I included the entire dmesg output from that xm create run. Here's more of the transcript in case it's useful:

http://www.theshore.net/~caker/xen/pvops-bug1/log.txt

Although, looking at it again, I did miss this line:

(XEN) mm.c:645:d341 Non-privileged (341) attempt to map I/O space 000d2e50

For reference:

$ gdb 2.6.26-rc8-linode11 GNU gdb Fedora (6.8-10.fc9)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
(no debugging symbols found)
(gdb) x/i 0x00000000c0103b55 <- note: need to add 0x to start 0xc0103b55 <make_lowmem_page_readonly+85>: ud2a (gdb) disassemble make_lowmem_page_readonly
Dump of assembler code for function make_lowmem_page_readonly:
0xc0103b00 <make_lowmem_page_readonly+0>:    push   %ebp
0xc0103b01 <make_lowmem_page_readonly+1>:    mov    %eax,%ebp
0xc0103b03 <make_lowmem_page_readonly+3>:    push   %edi

Cool, thanks :)

-Chris


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