Xen devel - Jul 2008 - xend crashing due to change in virt_kend value...??

Hi all,
  All of a sudden my xend is crashing, when i do "xm create domu" due
to
which the domains are created in paused state. 

Iam using minios as domU kernel, but the problem occurs even for
linux-2.6.18.1 pv kernel as domu kernel.

xend.log shows

[2008-07-31 03:00:54 14821] CRITICAL (SrvDaemon:231) Xend died due to
signal 11!  Restarting it....

after doing some preliminary investigation i found out the problem is
due to the change in virt_kend value, being derived from elf->pend
value. Due to this domU is throwing seg_faults

When things were fine the value of virt_kend used to be 0x1e1a4, but now
virt_kend is having value 0x1dfa4. I have no clue why this is happening
suddenly. Any clue or hints would be very helpful.   

here is a sample domain_builder log when xend crashes....

xc_dom_parse_image: called
xc_dom_find_loader: trying ELF-generic loader ... OK
elf_parse_binary: phdr: paddr=0x0 memsz=0x1dfa4
elf_parse_binary: memory: 0x0 -> 0x1dfa4
elf_xen_parse: __xen_guest:
"GUEST_OS=Mini-OS,XEN_VER=xen-3.0,VIRT_BASE=0x0,ELF_PADDR_OFFSET=0x0,HYPERCALL_PAGE=0x2,PAE=yes,LOADER=generic"
elf_xen_parse_guest_info: GUEST_OS="Mini-OS"
elf_xen_parse_guest_info: XEN_VER="xen-3.0"
elf_xen_parse_guest_info: VIRT_BASE="0x0"
elf_xen_parse_guest_info: ELF_PADDR_OFFSET="0x0"
elf_xen_parse_guest_info: HYPERCALL_PAGE="0x2"
elf_xen_parse_guest_info: PAE="yes"
elf_xen_parse_guest_info: LOADER="generic"
elf_xen_addr_calc_check: addresses:
    virt_base        = 0x0
    elf_paddr_offset = 0x0
    virt_offset      = 0x0
    virt_kstart      = 0x0
    virt_kend        = 0x1dfa4
    virt_entry       = 0x0
xc_dom_parse_elf_kernel: xen-3.0-x86_32p: 0x0 -> 0x1dfa4
xc_dom_mem_init: mem 32 MB, pages 0x2000 pages, 4k each
xc_dom_mem_init: 0x2000 pages
xc_dom_boot_mem_init: called
x86_compat: guest xen-3.0-x86_32p, address size 32


here is the log when xend is intact....

xc_dom_parse_image: called
xc_dom_find_loader: trying ELF-generic loader ... OK
elf_parse_binary: phdr: paddr=0x0 memsz=0x1e1a4
elf_parse_binary: memory: 0x0 -> 0x1e1a4
elf_xen_parse: __xen_guest:
"GUEST_OS=Mini-OS,XEN_VER=xen-3.0,VIRT_BASE=0x0,ELF_PADDR_OFFSET=0x0,HYPERCALL_PAGE=0x2,PAE=yes,LOADER=generic"
elf_xen_parse_guest_info: GUEST_OS="Mini-OS"
elf_xen_parse_guest_info: XEN_VER="xen-3.0"
elf_xen_parse_guest_info: VIRT_BASE="0x0"
elf_xen_parse_guest_info: ELF_PADDR_OFFSET="0x0"
elf_xen_parse_guest_info: HYPERCALL_PAGE="0x2"
elf_xen_parse_guest_info: PAE="yes"
elf_xen_parse_guest_info: LOADER="generic"
elf_xen_addr_calc_check: addresses:
    virt_base        = 0x0
    elf_paddr_offset = 0x0
    virt_offset      = 0x0
    virt_kstart      = 0x0
    virt_kend        = 0x1e1a4
    virt_entry       = 0x0
xc_dom_parse_elf_kernel: xen-3.0-x86_32p: 0x0 -> 0x1e1a4
xc_dom_mem_init: mem 32 MB, pages 0x2000 pages, 4k each
xc_dom_mem_init: 0x2000 pages
xc_dom_boot_mem_init: called
x86_compat: guest xen-3.0-x86_32p, address size 32



Thanks,
  Sandesh

\m/   \m/


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