On 3/30/20 7:01 AM, Naresh Kamboju wrote:
FYI,
The device is x86_64 device running i386 kernel image.
- Naresh
On Mon, 30 Mar 2020 at 19:00, Naresh Kamboju naresh.kamboju@linaro.org wrote:
On i386 running LTP hugetlb tests found kernel BUG at fs/hugetlbfs/inode.c:458 Running Linux version 5.6.0-rc7-next-20200330 And hugemmap test failed due to ENOMEM.
steps to reproduce: # cd /opt/ltp # ./runltp -f hugetlb
It took me a while to set up an environment to reproduce. I was finally able to reproduce on an x86_64 VM running a 32 bit OS/5.6.0-rc7-next-20200330 kernel.
My first attempt with PAE enabled and 8GB of memory did not reproduce. When I disabled PAE and dropped memory to 4GB, the problem reproduced.
After reverting this patch, and the followup in the series I was still able to recreate the issue. So, the patches are not the root cause.
One 'interesting' thing are the messages, mm/pgtable-generic.c:50: bad pgd ... These show up before the hugetlbfs BUG.
I will continue to investigate. However, if the 'bad pgd ..' message provides a hint to someone please let us know.