[Crash-utility] Re: [PATCH] get vmalloc start address from vmcoreinfo
Hi,
It would be good if this can be merged. The commit from linux-next is
now in Linux mainline tree.
commit: 55c49fee57af99f3c663e69dedc5b85e691bbe50
mm/vmalloc: remove vmap_area_list
Testing this will also require patching makedumpfile with below patch,
otherwise makedumpfile might fail to collect vmcore:
[PATCH] makedumpfile: ppc64: get vmalloc start address from vmcoreinfo
https://lore.kernel.org/kexec/kjitig4jcelchtqria3mmr2jd3h5uptpoeyesif6crn...
Any comments ?
Thanks,
- Aditya Gupta
On 01/03/24 16:16, Sachin Sant wrote:
>
>> On 01-Mar-2024, at 12:32 PM, Aditya Gupta <adityag(a)linux.ibm.com> wrote:
>>
>> Below error is noticed when running crash on vmcore collected from a linux-next
>> kernel crash (linux-next tag next-20240121):
>>
>> # crash /boot/vmlinuz-6.8.0-rc5-next-20240221 ./vmcore
>> ……
>> ……
>> For help, type “help”.
>> Type "apropos word" to search for commands related to
"word"...
>>
>> crash: page excluded: kernel virtual address: c00000000219a2c0 type:
“vmlist"
>>
>> This occured since getting the vmalloc area base address doesn't work in
>> crash now, due to 'vmap_area_list' being removed in the linux kernel
with
>> below commit (in linux-next tree):
>>
>> commit 378eb24a0658dd922b29524e0ce35c6c43f56cba
>> mm/vmalloc: remove vmap_area_list
>>
>> As an alternative, the commit introduced 'VMALLOC_START' in vmcoreinfo
to
>> get base address of vmalloc area, use it to return vmallow start address
>> instead of depending on vmap_area_list and vmlist
>>
>> Reported-by: Sachin Sant <sachinp(a)linux.ibm.com>
>> Signed-off-by: Aditya Gupta <adityag(a)linux.ibm.com>
>> ---
> Thanks Aditya for this fix. With this patch applied, crash is able to
> read vmcore generated against kernel that contains
> commit 378eb24a0658
>
> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com>
>
> — Sachin