Bug#446148: linux-image-2.6.18-5-xen-amd64: domU panic with swiotlb=force

[Jan Evert van Grootheest <j.e.van.grootheest@hccnet.nl>]

Package: linux-image-2.6.18-5-xen-amd64
Version: 2.6.18.dfsg.1-13etch4
Severity: normal

Using swiotlb=force panics the kernel reaaaaaly quick:
Bootdata ok (command line is  root=/dev/sda1 ro swiotlb=force)
Linux version 2.6.18-5-xen-amd64 (Debian 2.6.18.dfsg.1-13etch4)
(dannf@debian.org) (gcc version 4.1.2 20061115 (prerelease) (Debian
4.1.1-21)) #1 SMP Tue Oct 2 21:48:12 UTC 2007
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000035a00000 (usable)
 No mptable found.
 Built 1 zonelists.  Total pages: 219648
 Kernel command line:  root=/dev/sda1 ro swiotlb=force
 Initializing CPU#0
 PID hash table entries: 4096 (order: 12, 32768 bytes)
 Xen reported: 1800.061 MHz processor.
 Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes)
 Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
 ----------- [cut here ] --------- [please bite here ] ---------
 Kernel BUG at lib/../arch/i386/kernel/swiotlb.c:162
 invalid opcode: 0000 [1] SMP 
 CPU 0 
 Modules linked in:
 Pid: 0, comm: swapper Not tainted 2.6.18-5-xen-amd64 #1
 RIP: e030:[<ffffffff8030c7f8>]  [<ffffffff8030c7f8>]
 swiotlb_init_with_default_size+0xa0/0x19e
 RSP: e02b:ffffffff804dbf40  EFLAGS: 00010282
 RAX: 00000000fffffff4 RBX: 0000000000000000 RCX: 0000000000000006
 RDX: ffffffffff578000 RSI: 0000000000000000 RDI: 0000000000000000
 RBP: 0000000004000000 R08: 0000000000001000 R09: ffffffff80522040
 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 FS:  0000000000000000(0000) GS:ffffffff804c4000(0000)
 knlGS:0000000000000000
 CS:  e033 DS: 0000 ES: 0000
 Process swapper (pid: 0, threadinfo ffffffff804da000, task
 ffffffff8044bce0)
 Stack:  0000000000000000  0000000000000800  0000000000000000
 ffffffff8026e280 
  0000000000000000  ffffffff804ecf2a  0000000000000000  0000000000000800 
   0000000000000000  0000000000000000 
   Call Trace:
    [<ffffffff8026e280>] pci_swiotlb_init+0x9/0x2d
     [<ffffffff804ecf2a>] mem_init+0x5e/0x233
      [<ffffffff804e36ea>] start_kernel+0x189/0x21a
       [<ffffffff804e320d>] _sinittext+0x20d/0x213


       Code: 0f 0b 68 e1 36 41 80 c2 a2 00 48 83 eb 80 48 8b 05 bb 20 24 
       RIP  [<ffffffff8030c7f8>]
       swiotlb_init_with_default_size+0xa0/0x19e
        RSP <ffffffff804dbf40>
	 <0>Kernel panic - not syncing: Attempted to kill the idle task!

I was hoping this would fix the problem that usblp cannot allocate write
buffers for an USB connected printer.
But alas, this doesn't even produce a working domU.

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (990, 'stable')
Architecture: amd64 (x86_64)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-5-xen-amd64
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages linux-image-2.6.18-5-xen-amd64 depends on:
ii  e2fsprog 1.39+1.40-WIP-2006.11.14+dfsg-2 ext2 file system utilities and lib
ii  initramf 0.85h                           tools for generating an initramfs
ii  linux-mo 2.6.18.dfsg.1-13etch4           Linux 2.6.18 modules on AMD64

linux-image-2.6.18-5-xen-amd64 recommends no packages.

-- no debconf information