[Xen-devel] Xen0 crash dump (/dev/ram0 root) possibly of interest

[Jared Rhine <jared@xxxxxxxxxxx>]

I'm continuing to work on making a new XenCD as previously discussed here.  In 
the course of that work, I've generated (actually, currently stuck on) the 
enclosed crash dump.  Thought I'd forward it for interest.
To head off questions, you'll see references to a very large initrd (~114 Mb). 
   The Xen dump may or not be related to this unusual usage.  I've done both 
large initrds, small initrds, and small initrds in the past which copy larger 
filesystems to tmpfs.  I've done huge initrds with success before, outside of 
Xen.  The numbers below are calculated automatically and should be big enough, 
though may not be aligned properly.
Mark Williamson: if you see this, could you forward me a copy of the Xen 1.2 
CD you offered to do earlier?  I'd like to see to see which initrd techniques 
you used, if any.
My GRUB config looks like:

title xen
kernel /boot/xen dom0_mem=318464 com1=115200,8n1 console=com1,vga 
ignorebiostables nmi=ignore sched=bvt conswitch=xy noreboot
module /boot/xen0-vmlinuz ramdisk_size=203776 root=/dev/ram0 max_loop=96 rw 
console=ttyS0 vga=extended
module /boot/xen0-initrd

I can provide access to the ISO if anyone cares, though it's obviously 
non-functional currently.
 __  __            ____    ___
 \ \/ /___ _ __   |___ \  / _ \
  \  // _ \ '_ \    __) || | | |
  /  \  __/ | | |  / __/ | |_| |
 /_/\_\___|_| |_| |_____(_)___/

 http://www.cl.cam.ac.uk/netos/xen
 University of Cambridge Computer Laboratory

 Xen version 2.0 (jared@xxxxxxxxxxx) (gcc version 3.3.4 20040623 (Gentoo 
Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)) Thu Dec 30 10:51:11 PST 2004
 Latest ChangeSet: 2004/12/30 18:27:27 1.1624 41d4488f9fINTxUzyjoq2FnTn5AvMQ

(XEN) Physical RAM map:
(XEN)  0000000000000000 - 000000000009f800 (usable)
(XEN)  000000000009f800 - 00000000000a0000 (reserved)
(XEN)  00000000000ca000 - 00000000000cc000 (reserved)
(XEN)  00000000000dc000 - 00000000000e0000 (reserved)
(XEN)  00000000000e4000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000001eef0000 (usable)
(XEN)  000000001eef0000 - 000000001eefc000 (ACPI data)
(XEN)  000000001eefc000 - 000000001ef00000 (ACPI NVS)
(XEN)  000000001ef00000 - 000000001f000000 (usable)
(XEN)  00000000fec00000 - 00000000fec10000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000fffe0000 - 0000000100000000 (reserved)
(XEN) System RAM: 495MB (507452kB)
(XEN) Xen heap: 10MB (10776kB)
(XEN) CPU0: Before vendor init, caps: bfebfbff 00000000 00000000, vendor = 0
(XEN) CPU#0: Hyper-Threading is disabled
(XEN) CPU caps: bfebfbff 00000000 00000000 00000000
(XEN) Using scheduler: Borrowed Virtual Time (bvt)
(XEN) Initializing CPU#0
(XEN) Detected 1197.895 MHz processor.
(XEN) Found and enabled local APIC!
(XEN) enabled ExtINT on CPU#0
(XEN) ESR value before enabling vector: 00000000
(XEN) ESR value after enabling vector: 00000000
(XEN) Using local APIC timer interrupts.
(XEN) Calibrating APIC timer for CPU0...
(XEN) ..... CPU speed is 1197.8705 MHz.
(XEN) ..... Bus speed is 69.3984 MHz.
(XEN) ..... bus_scale = 0x00004711
(XEN) Time init:
(XEN) .... System Time: 1451424ns
(XEN) .... cpu_freq:    00000000:47666D94
(XEN) .... scale:       00000001:AB6A9983
(XEN) .... Wall Clock:  1104628571s 10000us
(XEN) PCI: PCI BIOS revision 2.10 entry at 0xfd9a0, last bus=1
(XEN) PCI: Using configuration type 1
(XEN) PCI: Probing PCI hardware
(XEN) PCI: Probing PCI hardware (bus 00)
(XEN) PCI: Using IRQ router PIIX/ICH [8086/7110] at 00:07.0
(XEN) PCI: Cannot allocate resource region 4 of device 00:07.1
(XEN) Limiting direct PCI/PCI transfers.
(XEN) mtrr: v2.0 (20020519)
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Xen-ELF header found: 
'GUEST_OS=linux,GUEST_VER=2.6,XEN_VER=2.0,VIRT_BASE=0xC0000000,LOADER=generic,PT_MODE_WRITABLE'
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Kernel image:  00c00000->00ffcd48
(XEN)  Initrd image:  00ffd000->08bbb000
(XEN)  Dom0 alloc.:   08c00000->1c300000
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: c0100000->c052a584
(XEN)  Init. ramdisk: c052b000->c80e9000
(XEN)  Phys-Mach map: c80e9000->c8136c00
(XEN)  Page tables:   c8137000->c8159000
(XEN)  Start info:    c8159000->c815a000
(XEN)  Boot stack:    c815a000->c815b000
(XEN)  TOTAL:         c0000000->c8400000
(XEN)  ENTRY ADDRESS: c0100000
(XEN) Scrubbing DOM0 RAM: ....done.
(XEN) Initrd len 0x7bbe000, start at 0xc052b000
(XEN) Scrubbing Free RAM: ......done.
(XEN) *** Serial input -> DOM0 (type 'CTRL-x' three times to switch input to 
Xen).
Linux version 2.6.10-xen0 (jared@bear) (gcc version 3.3.4 20040623 (Gentoo 
Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)) #1 Thu Dec 30 11:13:55 PST 2004
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000013700000 (usable)
311MB LOWMEM available.
DMI not present.
Built 1 zonelists
Kernel command line: ramdisk_size=203776 root=/dev/ram0 max_loop=96 rw 
console=ttyS0 vga=extended
Initializing CPU#0
PID hash table entries: 2048 (order: 11, 32768 bytes)
Xen reported: 1197.895 MHz processor.
Using tsc for high-res timesource
Console: colour VGA+ 80x25
(XEN) BUG at domain.c:152
(XEN) CPU:    0
(XEN) EIP:    0808:[<fc50603e>]
(XEN) EFLAGS: 00201296
(XEN) eax: 00000000   ebx: fc5fd9e0   ecx: 00000000   edx: fc4b8f00
(XEN) esi: 000d98f0   edi: c04f5200   ebp: 00000000   esp: fc503f9c
(XEN) ds: 0810   es: 0810   fs: 0810   gs: 0810   ss: 0810
(XEN) Stack trace from ESP=fc503f9c:
(XEN) fc529841 fc529882 00000098 000d98f0 [fc527ae6] 00000808 fc5fd9e0 00000000
(XEN)        00000001 00000000 c8159200 c04f5200 00000000 00020000 000d98f0 
00000061
(XEN)        000098f0 00201246 c04a1fb4 00000069 0000007b 0000007b 00000000 
00000000
(XEN)        fc5fd9e0
(XEN) Call Trace from ESP=fc503f9c: [<fc527ae6>]

****************************************
CPU0 FATAL TRAP: vector = 6 (invalid operand)
[error_code=0000]
Aieee! CPU0 is toast...
****************************************

Reboot in five seconds...
(XEN) Reboot disabled on cmdline: require manual reset



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