[Xen-users] Linux 2.3.23-rc3 on Xen 3.1 fails in xen_write_cr4

[Bastian Blank <bastian@xxxxxxxxxxxx>]

Hi folks

Linux 2.6.23-rc3 with xen enabled fails on Xen 3.1:
| (XEN) traps.c:1642:d4 Attempt to change CR4 flags.
| general protection fault: 0000 [#1]
[...]
| EIP is at xen_write_cr4+0x3/0x7
[...]
| Call Trace:
|  [<c0318f2c>] stop_mce+0x21/0x22

Any suggestions? It seems that some parts of the kernel wants to mess
with CR4. Is it the MCE support?

The complete gpf:
| general protection fault: 0000 [#1]
| SMP 
| Modules linked in:
| CPU:    0
| EIP:    e019:[<c010191f>]    Not tainted VLI
| EFLAGS: 00010202   (2.6.23-rc3-xen-686 #1)
| EIP is at xen_write_cr4+0x3/0x7
| eax: 00000620   ebx: c110a000   ecx: 078bc136   edx: 078bc136
| esi: c033ee2c   edi: c1107e2c   ebp: 00000020   esp: c030df9c
| ds: e021   es: e021   fs: 00d8  gs: 0000  ss: e021
| Process swapper (pid: 0, ti=c030c000 task=c02e4260 task.ti=c030c000)
| Stack: c0318f2c c0318846 c0318e03 0000e019 00010202 c110a000 c0311905 
0000002c 
|        c03110e9 c030dff0 00009000 c0329ba0 c030dff0 00388000 c030dfe4 
00000000 
|        c0316c27 00000000 078bc1f1 00000001 00000800 00000623 00000000 
c0a24000 
| Call Trace:
|  [<c0318f2c>] stop_mce+0x21/0x22
|  [<c0318846>] alternative_instructions+0xe/0x10c
|  [<c0318e03>] check_bugs+0x90/0x130
|  [<c0311905>] start_kernel+0x30a/0x317
|  [<c03110e9>] unknown_bootoption+0x0/0x195
|  [<c0316c27>] xen_start_kernel+0x162/0x169
|  =======================
| Code: 5a 89 f0 5b 5e 5f 5d c3 c3 31 c0 c3 64 8b 15 08 80 33 c0 89 42 08 c3 64 
a1 08 80 33 c0 8b 40 08 c3 64 a1 28 80 33 c0 c3 83 e0 fb <0f> 22 e0 c3 64 a1 0c 
80 33 c0 c3 56 89 c6 53 bb 02 00 00 00 ff 
| EIP: [<c010191f>] xen_write_cr4+0x3/0x7 SS:ESP e021:c030df9c
| Kernel panic - not syncing: Attempted to kill the idle task!

BAstian

-- 
Fascinating, a totally parochial attitude.
                -- Spock, "Metamorphosis", stardate 3219.8

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