[Crash-utility] crash and makedumpfile with 5.3 missing memory in dump

[John Donnelly]

On 11/1/19 7:48 AM, Dave Anderson wrote:

SEE BELOW
> 
> 
> ----- Original Message -----
>> Hi,
>>
>> [I'm not sure if that is a crash or mkdumpfile problem]
>>
>> I'm trying to use crash to read a makedumpfile vmcore from 5.3, but I always
>> end up with an error when opening the dump.
>>
>> I'm using the latest github crash
>>
>> crash 7.2.7++
>> ...
>>   crash: page excluded: kernel virtual address: ffffffff82110370  type:
>>   "possible"
>>   WARNING: cannot read cpu_possible_map
>>   crash: page excluded: kernel virtual address: ffffffff82110360  type:
>>   "present"
>>   WARNING: cannot read cpu_present_map
>>   crash: page excluded: kernel virtual address: ffffffff82110368  type:
>>   "online"
>>   WARNING: cannot read cpu_online_map
>>   crash: page excluded: kernel virtual address: ffffffff82110358  type:
>>   "active"
>>   WARNING: cannot read cpu_active_map
>>   crash: page excluded: kernel virtual address: ffffffff82011544  type:
>>   "init_uts_ns"
>>   crash: page excluded: kernel virtual address: ffffffff82110360  type:
>>   "cpu_present_map"
>>   crash: page excluded: kernel virtual address: ffffffff82110360  type:
>>   "cpu_present_map"
>>   WARNING: ORC unwinder: cannot read lookup_num_blocks
>>   crash: seek error: kernel virtual address: ffff88822dffb000  type:
>>   "memory section root table"
>>
>> The dump is created with the latest makedumpfile release
>>
>> makedumpfile: version 1.6.6 (released on 27 Jun 2019)
>>
>> It complains that it doesn't support the kernel
>>
>> Any ideas?
>>
>> -Andi
>>
> 
> Yeah, I'm not sure either.  I've tested the github crash on kernels up to 5.4-rc5,
> but only running on a live system.  Given that the errors indicate "page excluded",
> it looks like makedumpfile 1.6.6 may not cover 5.4 kernels.  The makedumpfile git
> log's master branch shows these as the last two commits:
> 
>    commit 0a8b504102dbdb952b2e2e3ce15ae706165eba4e
>    Author: Kazuhito Hagio <k-hagio at ab.jp.nec.com>
>    Date:   Thu Jun 27 08:42:40 2019 -0400
> 
>      [v1.6.6] Update version
>      
>      Update makedumpfile to version 1.6.6.
>      
>      Signed-off-by: Kazuhito Hagio <k-hagio at ab.jp.nec.com>
> 
>    commit 8c21fc7e7c52a2c3e0299e50a8b37becadfa77b4
>    Author: Kazuhito Hagio <k-hagio at ab.jp.nec.com>
>    Date:   Thu Jun 13 15:32:55 2019 -0400
> 
>      [PATCH] Support newer kernels up to v5.1
>      
>      A new makedumpfile supports newer kernels:
>      
>        - 4.20, 5.0, 5.1  (x86 FLATMEM)
>        - 4.20, 5.0, 5.1  (x86 SPARSEMEM)
>        - 4.20, 5.0, 5.1  (x86_64 SPARSEMEM)
>      
>      Signed-off-by: Kazuhito Hagio <k-hagio at ab.jp.nec.com>
> 
> Dave
> 
> 
> 
> 


Hello,


Kazuhito Hagio asked me to share my test results on this patch for 
makedumpfile :


https://urldefense.proofpoint.com/v2/url?u=https-3A__sourceforge.net_p_makedumpfile_code_ci_7bdb468c2c99dd780c9a5321f93c79cbfdce2527_&d=DwIGaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=t2fPg9D87F7D8jm0_3CG9yoiIKdRg4qc_thBw4bzMhc&m=RRTWEGpecudcCrNL7TSmV5r2eIO7t_VrYruNXGGFhUE&s=BlcGeqwro6opkCKG9utpl8jfwoHMehRzt_V0nGz1fk4&e= 


And I was successfully able to get vmcore dumps on vmlinuz-5.3.6 and 
5.4.0-rc3 Intel ( x86-64) kernels.

Also I was able to use crash

   7.2.6-2.el8

to review the dump.  I didn't do a lot of crash comamnds but it did 
process the vmcore



> 
> 
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-- 
Thank You,
John