Re: FIle copy to FAT FS on NVDIMM hits BUG_ON at fs/buffer.c:3305!

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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.



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