Re: [PATCH] mm/hugetl.c: keep the page mapping info when free_huge_page() hit the VM_BUG_ON_PAGE

[Yongkai Wu <nic.wuyk@gmail.com>]

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Dear Mike,
Glad to get your reply.I am sorry for late reply because i am on business
trip today.I will tell more detail about the issue i met later.
And because i have no experience how to send a kernel patch correctly,so it
may takes some time for me to learn that before i resend the patch.

Best regards

On Wed, Nov 14, 2018 at 2:05 AM Mike Kravetz <mike.kravetz@oracle.com>
wrote:

> On 11/13/18 7:12 AM, Yongkai Wu wrote:
> > Dear Maintainer,
> > Actually i met a VM_BUG_ON_PAGE issue in centos7.4 some days ago.When
> the issue first happen,
> > i just can know that it happen in free_huge_page() when doing soft
> offline huge page.
> > But because page->mapping is set to null,i can not get any further
> information how the issue happen.
> >
> > So i modified the code as the patch show,and apply the new code to our
> produce line and wait some time,
> > then the issue come again.And this time i can know the whole file path
> which trigger the issue by using
> > crash tool to get the inode、dentry and so on,that help me to find a way
> to reproduce the issue quite easily
> > and finally found the root cause and solve it.
>
> Thank you for the information and the patch.
>
> As previously stated by Michal, please add some additional information to
> the
> change log (commit message) and fix the formatting of the patch.
>
> Can you tell us more about the root cause of your issue?  What was the
> issue?
> How could you reproduce it?  How did you solve it?
> --
> Mike Kravetz
>

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