Yury, Richard, On Tue, Sep 26, 2017 at 08:23:35AM -0600, Ruigrok, Richard wrote: > On 9/26/2017 4:23 AM, 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! > > > The RCU stall is side effect. The issue I'm seeing has the same stack > trace and same stimulus (rwtest). Following are the details.
FWIW, I think I've worked out what's going on here and I should have a patch tomorrow. Will
