vmcore file 0 size in x86_64

[Chandan12 K]

Hi, 

Adding boot logs 

NET: Registered protocol family 1 
audit: initializing netlink socket (disabled) 
type=2000 audit(1250069944.104:1): initialized 
VFS: Disk quotas dquot_6.5.1 
Dquot-cache hash table entries: 512 (order 0, 4096 bytes) 
Warning: Core image elf header is notsane 
Kdump: vmcore not initialized 
Registering unionfs 2.2-mm 
msgmni has been set to 90 
io scheduler noop registered 
io scheduler anticipatory registered


however, similar case has already been discussed in other mailing lists 
with vivek. The only difference is that, I am not using redhat system and 
dont have any user level kexel tools.   

https://lists.linux-foundation.org/pipermail/fastboot/2007-January/012572.html 


The kernel command line of capture kernel (kexe'ed kernel) : Kernel 
command line: root=/dev/nfs rw console=ttyS0,115200 ip=::::::dhcp 
selinux=0 noacpi maxcpus=1 memmap=exactmap memmap=640K at 0K 
memmap=64876K at 16384K elfcorehdr=81260K 


Command line for the Primary kernel : root=/dev/nfs rw 
console=ttyS0,115200 ip=::::::dhcp crashkernel=64M at 16M 

kexec command used : kexec -p bzImage --append="root=/dev/nfs rw 
console=ttyS0,115200 ip=::::::dhcp selinux=0 noacpi maxcpus=1" 

Kconfig options : 

CONFIG_CRASH_DUMP=y 
CONFIG_PHYSICAL_START=0x200000 
CONFIG_RELOCATABLE=y 
CONFIG_PHYSICAL_ALIGN=0x200000

Please suggest. 


Chandan 



Dave Anderson <anderson at redhat.com> 
Sent by: crash-utility-bounces at redhat.com 
08/12/2009 07:39 PM 

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Subject
Re: [Crash-utility] vmcore file size 0 on x86_64









Forwarded to kexec list:

 http://lists.infradead.org/pipermail/kexec/2009-August/003474.html

----- "Chandan12 K" <chandan12.k at tcs.com> wrote:

> Hi,
> 
> I am little new in this mailing list. I just wondered if anybody could
> help me regarding the vmcore file generation. I ran kexec on my x86_64
> machine, and the /proc/vmcore file is created with zero size.
> 
> However, even if I read the /dev/oldmem file, I am only able to read
> till 16M. I guess I am only able to read till the 'X', where X is
> crashkernel=Y at X.
> 
> Moreover, My machine seems to have 32 bit user space and ofcourse, 64
> bit kernel space.
> 
> Appreciate any response.
> 
> Chandan Kumar
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Chandan Kumar
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