On Tue, 2017-07-25 at 16:22 -0600, Ross Zwisler wrote: > On Tue, Jul 25, 2017 at 09:37:38PM +0000, Kani, Toshimitsu wrote: > > Hi, > > > > Copying files to vfat FS on an NVDIMM device hits > > BUG_ON(!PageLocked(page)) in try_to_free_buffers(). It happens on > > 4.13-rc1, and happens on older kernels as well. > > > > A simple reproducer is shown below. It is 100% reproducible on my > > setup (8GB of regular memory and 16GB of NVDIMM). It usually hits > > in the 3rd or 4th file copy and does not repeat with the while- > > loop. Interestingly, it hits only when an NVDIMM device is set as > > raw or memory mode. It does not hit with sector mode. > > Interesting, thanks for the report.. I was able to reproduce this in > my KVM setup with a virtualized NVDIMM using v4.12. I also tried > reproducing it with BRD, and wasn't able. > > I'll take a look. Great!! Thanks Ross! -Toshi
