Hi all,

My Dom0 crashed if I use the first grub configuration, but is ok if I use
the following one.

kernel          /boot/xen-3.4-unstable.gz
module          /boot/vmlinuz-2.6.18.8-xen root=/dev/sda2 ro

kernel          /boot/xen-3.4-unstable.gz com1=9600,8n1 console=com1 iommu=1
module          /boot/vmlinuz-2.6.18.8-xen root=/dev/sda2 ro xencons=ttyS
console=tty0 console=ttyS0

I've attached the full boot trace. Below is a snippet of the crash region.
Does anyone have any idea what's going on?

Thanks and have a nice day.


- Alexia

================================================
USB Universal Host Controller Interface driver v3.0
ACPI: PCI Interrupt 0000:00:1a.0[A] -> GSI 16 (level, low) -> IRQ 16
uhci_hcd 0000:00:1a.0: UHCI Host Controller
uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:1a.0: irq 16, io base 0x0000e0e0
(XEN) [VT-D]iommu.c:721: iommu_page_fault: iommu->reg = ffff828bfff55000
(XEN) [VT-D]iommu.c:693: iommu_fault_status: Primary Pending Fault
(XEN) [VT-D]iommu.c:675: iommu_fault:DMA Read: 0:1a.0 addr bf7ed000 REASON 6
iommu->reg = ffff828bfff55000
(XEN) print_vtd_entries: iommu = ffff8300bfef10f0 bdf = 0:1a:0 gmfn = bf7ed
(XEN)     root_entry = ffff83013bdea000
(XEN)     root_entry[0] = 1374a0001
(XEN)     context = ffff8301374a0000
(XEN)     context[d0] = 101_13bde6001
(XEN)     l3 = ffff83013bde6000
(XEN)     l3_index = 2
(XEN)     l3[2] = 137a83003
(XEN)     l2 = ffff830137a83000
(XEN)     l2_index = 1fb
(XEN)     l2[1fb] = 137887003
(XEN)     l1 = ffff830137887000
(XEN)     l1_index = 1ed
(XEN)     l1[1ed] = 0
(XEN)     l1[1ed] not present
uhci_hcd 0000:00:1a.0: host system error, PCI problems?
uhci_hcd 0000:00:1a.0: host controller halted, very bad!
uhci_hcd 0000:00:1a.0: HC died; cleaning up
usb usb1: configuration #1 chosen from 1 choice
usb usb1: can't set config #1, error -108
uhci_hcd 0000:00:1a.0: HC died; cleaning up
Unable to handle kernel NULL pointer dereference at 0000000000000018 RIP:
 [<ffffffff88019be9>] :usbcore:usb_kick_khubd+0x7/0x17
PGD ef053067 PUD ef051067 PMD 0
Oops: 0000 [1] SMP
CPU 3
Modules linked in: uhci_hcd usbcore thermal processor fan
Pid: 496, comm: insmod Not tainted 2.6.18.8-xen #1
RIP: e030:[<ffffffff88019be9>]  [<ffffffff88019be9>]
:usbcore:usb_kick_khubd+0x7/0x17
RSP: e02b:ffff8800eeb6fc50  EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff8800eed03c00 RCX: ffffffffff578000
RDX: ffffffffff578000 RSI: 0000000000000001 RDI: ffff8800ef03e000
RBP: 0000000000000000 R08: 000000000000000e R09: 0000000000000001
R10: ffff8800ef052570 R11: ffffffff80300885 R12: ffff8800eecb01c8
R13: 0000000000000000 R14: ffff8800ef03e000 R15: ffff8800eecb0070
FS:  00002ad0ef6c66d0(0000) GS:ffffffff804d9180(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000
Process insmod (pid: 496, threadinfo ffff8800eeb6e000, task
ffff8800eec867a0)
Stack:  ffffffff8801a39b 0000000000000012 ffff8800ef03e000 ffff8800eed03c00
 ffffffff8801ad3c 0000001000000004 ffff8800eecb00e0 ffff8800eed03c00
 ffff8800eecb0000 0000000000000004 ffffffff8803d4a0 0000000000000000
Call Trace:
 [<ffffffff8801a39b>] :usbcore:usb_hc_died+0x5f/0x72
 [<ffffffff8801ad3c>] :usbcore:usb_add_hcd+0x4eb/0x562
 [<ffffffff880230cf>] :usbcore:usb_hcd_pci_probe+0x1e6/0x28f
 [<ffffffff802f4f5e>] pci_device_probe+0x4c/0x75
 [<ffffffff8034f250>] pci_bus_probe_wrapper+0x86/0x92
 [<ffffffff802f4e48>] pci_match_device+0x13/0xbd
 [<ffffffff8803d000>] :uhci_hcd:uhci_start+0x21e/0x3c0
 [<ffffffff802f4f06>] pci_bus_match+0x14/0x20
 [<ffffffff80346048>] driver_probe_device+0x52/0xa8
 [<ffffffff80346177>] __driver_attach+0x6d/0xaa
 [<ffffffff8034610a>] __driver_attach+0x0/0xaa
 [<ffffffff80345a49>] bus_for_each_dev+0x43/0x6e
 [<ffffffff803456a7>] bus_add_driver+0x7e/0x130
 [<ffffffff802f50f9>] __pci_register_driver+0x57/0x7d
 [<ffffffff8804305c>] :uhci_hcd:uhci_hcd_init+0x5c/0x97
 [<ffffffff8024b1f5>] sys_init_module+0x16cc/0x1883
 [<ffffffff8020a518>] system_call+0x68/0x6d
 [<ffffffff8020a4b0>] system_call+0x0/0x6d


Code: 48 8b 40 18 48 8b b8 f0 01 00 00 e9 52 db ff ff 41 56 41 55
RIP  [<ffffffff88019be9>] :usbcore:usb_kick_khubd+0x7/0x17
 RSP <ffff8800eeb6fc50>
CR2: 0000000000000018
 Killed