Re: 0604a4fd53 ("x86/mm: remove vmalloc faulting"): [ 80.661587] BUG: unable to handle page fault for address: fb40c000

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Hi,

On Thu, May 28, 2020 at 04:42:09PM +0800, kernel test robot wrote:
> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> 
> commit 0604a4fd53020a98f029e7fd56d896a136ff2357
> Author:     Joerg Roedel <jroedel@xxxxxxx>
> AuthorDate: Sat May 16 15:19:37 2020 +1000
> Commit:     Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> CommitDate: Sat May 16 15:19:37 2020 +1000


Tried to reproduce this today and found another bug in KVM along the
way. But anyway, I wasn't able to reproduce this on latest linux-next.
By looking at the exact commit-id reported above, I found that this
report is a false-positive.

Above commit-id refers to an old version of the patch-set which does not
call arch_sync_kernel_mappings() in map_kernel_range_noflush(). So the
oops comes from missing synchronization there. But that is fixed already
in latest next/master.

Regards,

	Joerg




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