Bug#446148: domU panic with swiotlb=force
I'm seeing much the same thing:
Linux version 2.6.18-6-xen-686 (Debian 2.6.18.dfsg.1-24)
(dannf@debian.org) (gcc version 4.1.2 20061115 (prerelease) (Debian
4.1.1-21)) #1 SMP Sat Dec 27 13:17:00 UTC 2008
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 0000000032800000 (usable)
80MB HIGHMEM available.
727MB LOWMEM available.
NX (Execute Disable) protection: active
ACPI in unprivileged domain disabled
Built 1 zonelists. Total pages: 206848
Kernel command line: root=/dev/xvda1 ro ip=:1.2.3.4::::eth0:dhcp
iommu=soft swiotlb=force xencons=tty0
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 16384 bytes)
Xen reported: 2009.260 MHz processor.
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
------------[ cut here ]------------
kernel BUG at lib/../arch/i386/kernel/swiotlb.c:162!
invalid opcode: 0000 [#1]
SMP
Modules linked in:
CPU: 0
EIP: e019:[<c01bf045>] Not tainted VLI
EFLAGS: 00010282 (2.6.18-6-xen-686 #1)
EIP is at swiotlb_init_with_default_size+0x88/0x14e
eax: fffffff4 ebx: 00000100 ecx: f55f6000 edx: c0320000
esi: c0349404 edi: 04000000 ebp: c0321fc0 esp: c0321fb4
ds: e021 es: e021 ss: e021
Process swapper (pid: 0, ti=c0320000 task=c02d0660 task.ti=c0320000)
Stack: c1093000 c0349404 c111eb07 00000020 c032f577 0000000e 00000002
c1093000
c0349404 c108d364 00000020 c032557f 00008000 c034d280 01020800
c1149000
00000000 00000000 c010006f
Call Trace:
[<c032f577>] mem_init+0x58/0x392
[<c032557f>] start_kernel+0x1fb/0x37f
Code: b0 b9 f5 ff 83 c8 ff 40 83 f8 06 75 fa 89 d8 b9 1f 00 00 00 c1 e0
0b ba 06 00 00 00 03 05 14 65 37 c0 e8 2e 49 f5 ff 85 c0 74 08 <0f> 0b
a2 00 c3 86 2a c0 83 eb 80 a1 18 65 37 c0 39 c3 72 c5 b9
EIP: [<c01bf045>] swiotlb_init_with_default_size+0x88/0x14e SS:ESP
e021:c0321fb4
<0>Kernel panic - not syncing: Attempted to kill the idle task!
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