Re: [Xen-devel] What is the state of blktap2?

["David P. Quigley" <dpquigl@xxxxxxxxxxxxx>]

On Tue, 2010-01-26 at 09:42 -0500, Konrad Rzeszutek Wilk wrote:
> > I've been trying for the better part of today to get this working and I
> > seem to keep hitting a wall. I finally managed to get the kernel booted
> > but only with a serial console. I found out that some modules were
> 
> Care to send it?

The kernel or the config? I'm using the config given on the pvops wiki
page and I haven't made any modifications. Although I'm not sure if
SELinux is enabled so I might have to change that.

> > missing so that might have caused the lack of console support but now
> > the kernel won't boot to a prompt at all. I keep running into a null
> > dereference in the uhci driver. I can try to rebase Jeremy's patches
> 
> That is not good. First time I hear of it. You could compile most of the
> USB drivers in your kernel, and also the storage controller ones.

Yea I found this to be a little weird considering on other kernels the
uhci driver has no problems at all. Someone here thinks it might be an
issue with the ACPI aperture with things not lining up. I'm running an
optiplex 960 for my xen development box. 

> 
> > onto a newer kernel.org version but I'd first like to check to make sure
> > this isn't already a known problem with a solution.
> 
> What was your underlaying distro? Fedora? Debian?
> > 
> > Dave
> > 

So I'm running on an updated Fedora 11 box. I've grabbed Jeremy's pvops
kernel from kernel.org and I'm using the latest xen-unstable tree as of
yesterday at 5pm. Several of the uhci host controller sections in dmesg
are reporting the same error but I have copied some of the error text
with the kernel oops below.


uhci_hcd 0000:00:1a.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
uhci_hcd 0000:00:1a.1: UHCI Host Controller
uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1a.1: irq 17, io base 0x0000ff00
uhci_hcd 0000:00:1a.1: host system error, PCI problems?
uhci_hcd 0000:00:1a.1: host controller halted, very bad!
uhci_hcd 0000:00:1a.1: HC died; cleaning up
usb usb3: unable to read config index 0 descriptor/start: -108
usb usb3: chopping to 0 config(s)
usb usb3: string descriptor 0 read error: -108
ata3: SATA link down (SStatus 4 SControl 300)
ata6: SATA link down (SStatus 0 SControl 300)
usb usb3: New USB device found, idVendor=1d6b, idProduct=0001
usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb3: no configuration chosen from 0 choices
uhci_hcd 0000:00:1a.1: HC died; cleaning up
BUG: unable to handle kernel NULL pointer dereference at 0000000000000098
IP: [<ffffffff813be3d2>] usb_kick_khubd+0x23/0x4c
PGD 0 
Oops: 0000 [#1] SMP 
last sysfs file: 
CPU 0 
Modules linked in:
Pid: 112, comm: work_for_cpu Not tainted 2.6.31.6-pvops-dom0 #6 OptiPlex 960    
             
RIP: e030:[<ffffffff813be3d2>]  [<ffffffff813be3d2>] usb_kick_khubd+0x23/0x4c
RSP: e02b:ffff8801dd071d40  EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8801dd1a0000 RCX: 00000000000001af
RDX: ffff8801dd7d4880 RSI: ffff8801dd1a0848 RDI: ffff8801dd1a0848
RBP: ffff8801dd071d50 R08: 000000000000000c R09: ffff8801dd071bf0
R10: 00000002c6caa903 R11: 0000000000000144 R12: 0000000000000200
R13: ffff8801dd1a0848 R14: ffff8801dd1a0848 R15: 0000000000000011
FS:  0000000000000000(0000) GS:ffffc90000000000(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000098 CR3: 0000000001001000 CR4: 0000000000002660
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process work_for_cpu (pid: 112, threadinfo ffff8801dd070000, task 
ffff8801dd7d4880)
Stack:
 0000000000000200 00000000035b2d49 ffff8801dd071d80 ffffffff813c422b
<0> ffff8801dd071d80 00000000035b2d49 ffff8801dd1a0000 0000000000000000
<0> ffff8801dd071df0 ffffffff813c55f6 40ff8801dd071df0 000000000000ff00
Call Trace:
 [<ffffffff813c422b>] usb_hc_died+0x78/0xa3
 [<ffffffff813c55f6>] usb_add_hcd+0x544/0x6a8
 [<ffffffff813d5206>] usb_hcd_pci_probe+0x263/0x3bd
 [<ffffffff8107e91c>] ? do_work_for_cpu+0x0/0x50
 [<ffffffff8129658f>] local_pci_probe+0x2a/0x42
 [<ffffffff8107e943>] do_work_for_cpu+0x27/0x50
 [<ffffffff81083c80>] kthread+0xac/0xb4
 [<ffffffff810161aa>] child_rip+0xa/0x20
 [<ffffffff81015b10>] ? restore_args+0x0/0x30
 [<ffffffff810161a0>] ? child_rip+0x0/0x20
Code: 18 5b 41 5c 41 5d c9 c3 55 48 89 e5 48 83 ec 10 0f 1f 44 00 00 65 48 8b 
04 25 28 00 00 00 48 89 45 f8 31 c0 48 8b 87 88 02 00 00 <48> 8b 80 98 00 00 00 
48 8b b8 f8 00 00 00 e8 6d fe ff ff 48 8b 
RIP  [<ffffffff813be3d2>] usb_kick_khubd+0x23/0x4c
 RSP <ffff8801dd071d40>
CR2: 0000000000000098
---[ end trace cf0e97f02af8794f ]---



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