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.
