vmcore-dmesg ends with "No program header covering vaddr"

[Baoquan He]

On 03/14/14 at 10:39pm, Prasad Koya wrote:
> Hi
> 
> I'm increasing dmesg buffer size at runtime by passing log_buf_len=1M
> (or 512K) at command line. At compile time, I have LOG_BUF_LEN as
> 256K. However, when this kernel crashes (crashkernel set at 64M),
> vmcore-dmesg fails with below error.
> 
> No program header covering vaddr 0xffff88013ff00000found kexec bug?
> 
> Am I missing something here?
> 
> Thank you.
> 
> Here are some debugs I added to kernel. This is with 3.4 kernel and
> I've tried with kexec-tools-2.0.4.
> 
> [    0.000000] log_buf_len_setup: log_buf_len 262144 new 1048576
> ffffffff8170b140
> [    0.000000] setup_log_buf: early 1 262144 new_log_buf_len 1048576
> [    0.000000] log_buf_len: 1048576 ffff880037d58000
> [    0.000000] early log buf free: 258671(98%)
> [    0.000000] setup_log_buf: early 0 1048576 new_log_buf_len 0
> [    0.503752] log_buf_kexec_setup: lbl 1048576 new 0 ffffffff816198c4
> logbuf ffff880037d58000
> In kdump, running vmcore_dmesg /proc/vmcore
> No program header covering vaddr 0xffff88013ff00000found kexec bug?

Hi Prasad,

Did you try the latest kernel and vmcore-dmesg? Mine is OK. Surely you
need apply below patch since it's not merged yet. 

Author: Lubomir Rintel <lkundrak at v3.sk>
Date:   Wed Sep 18 14:21:43 2013 +0200

    vmcore-dmesg: Understand >= v3.11-rc4 dmesg
    
    Symbol name changed with the following commit:
    62e32ac printk: rename struct log to struct printk_log

Thanks
Baoquan

> 
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