Messages in this thread | | | Date | Tue, 26 Sep 2017 14:54:24 +0300 | From | Yury Norov <> | Subject | Re: ARM64: kernel panics in DABT in sys_msync path |
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On Tue, Sep 26, 2017 at 11:23:24AM +0100, Will Deacon wrote: > On Mon, Sep 25, 2017 at 01:54:57PM -0600, Ruigrok, Richard wrote: > > I also found this issue with kernels from 4.11 through 4.13. In my tests, I > > found that it reproduces only with 4K page and Transparent Huge Pages. With 64K > > page I was not able to reproduce. RH also reported it here: https:// > > bugzilla.redhat.com/show_bug.cgi?id=1491504 Linaro reported on the RPK kernel > > (4.12) on Centriq2400 and ThunderX > > > > > > https://bugs.linaro.org/show_bug.cgi?id=3191 > > > > https://bugs.linaro.org/show_bug.cgi?id=3068. > > These two aren't the same bug (that's a forward progress issue that we're > currently working on). I don't have permission to look at the redhat one, > but is it just an RCU stall or actually the Oops reported by Yury? > > > I was able to bisect down to a specific commit. > > I think we're chasing two different things here, so not sure I trust the > bisect! > > Will
I ran test 30 times on 4.14-rc2 kernel with 64K pages, and no panics happened. So it may be same bug though, or somehow related? I'll do some bisects and report results here.
Yury
> > First bad commit is: > > commit f27176cfc363d395eea8dc5c4a26e5d6d7d65eaf > > Author: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> > > Date: Fri Feb 24 14:57:57 2017 -0800 > > > > mm: convert page_mkclean_one() to use page_vma_mapped_walk() > > > > For consistency, it worth converting all page_check_address() to > > page_vma_mapped_walk(), so we could drop the former. > > > > PMD handling here is future-proofing, we don't have users yet. ext4 > > with huge pages will be the first. > > > > I did not use virtualization, simply booting kernel and running the LTP > > rwtest: ./runltp -p -f fs -s rwtest > > To validate bisecting (good points), I ran 30 iterations. Usually it > > reproduces in 5-10 iterations. > > > > If you have any suggestions for instrumentation I can run tests, we can work > > with 4.13 or on 4.11 at the above bisect point. > > I have not tried the 4.14-rc's yet.
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