Hi Tao,

On 10/7/2025 1:11 AM, Tao Liu wrote:
> On Tue, Sep 30, 2025 at 8:18 PM lijiang <lijiang@redhat.com> wrote:
>>
>> On Tue, Sep 30, 2025 at 3:01 PM Mikhail Zaslonko <zaslonko@linux.ibm.com> wrote:
>>>
>>> Hello,
>>>
>>> On 9/30/2025 4:53 AM, lijiang wrote:
>>>> On Tue, Sep 30, 2025 at 2:18 AM Mikhail Zaslonko <zaslonko@linux.ibm.com>
>>>> wrote:
>>>>
>>>>> Hi Lianbo,
>>>>>
>>>>> It seems we have a problem printing disassembly blocks in the log after
>>>>> this patch (at least on s390).
>>>>> See number of empty lines printed below.
>>>>>
>>>>
>>>> Can you try it with the following two patches?
>>>> [1]
>>>> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01621.html
>>> This patch is present on crash master, doesnt affect the issue.
>>>> [2]
>>>> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01636.html
>>>>
>>> This one helps indeed! At least I do not se the blanks lines in my scenario.
>>> BUT, if I use 'log -R' the blank lines are back again!
>>
>>
>> Thanks for the information, Mikhail.
>> Let me see how to debug this(although I can not reproduce it on s390x).
>
> I didn't reproduce the issue on my s390x machine either, maybe sharing
> the vmcore to us can help.

I'm not sure I'm allowed to send this data outside.

I think the problem takes place for the logs printed with pr_cont() by the
kernel (e.g. show_code() of arch/s390/kernel/dis.c for printing disassembly as
in my sample).