Dying SD memory? handle_workitem_freefile: got error 5 while accessing filesystem

[Konstantin Belousov]

On Sun, Sep 24, 2017 at 02:19:26PM +0200, O. Hartmann wrote:
> Am Sun, 24 Sep 2017 10:52:38 +0300
> Konstantin Belousov <kostikbel at gmail.com> schrieb:
> 
> > On Sun, Sep 24, 2017 at 09:31:51AM +0200, O. Hartmann wrote:
> > > Running a NanoBSD application on a small PCEngine device, feeding the box with a
> > > CURRENT (FreeBSD 12.0-CURRENT #33 r323958: Sat Sep 23 22:19:57 CEST 2017 amd64),
> > > booting from a SD memory card.
> > > 
> > > Recently, when saving configuration changes on the SD memory card, I receive these
> > > strange errors:
> > > 
> > > [...]
> > > checksum failed: cg 0, cgp: 0xb478d1d5 != bp: 0x874608df
> > > checksum failed: cg 12, cgp: 0xe626d67c != bp: 0x7360c12a
> > > checksum failed: cg 0, cgp: 0xb478d1d5 != bp: 0x874608df
> > > handle_workitem_freefile: got error 5 while accessing filesystem
> > > checksum failed: cg 12, cgp: 0xe626d67c != bp: 0x7360c12a
> > > handle_workitem_freefile: got error 5 while accessing filesystem
> > > [...]
> > > 
> > > I do not use MMCCAM in the kernel, but as far as I know, the problem occured in the
> > > same time frame. 
> > > 
> > > The question is: is the SD memory about to die and is to be replaced or is this a bug
> > > introduced with the new MMCCAM stuff recently?  
> > 
> > The messages you see about 'checksum_failed' are due to recently added
> > UFS feature where cylinder group blocks are checksummed, and the checksum
> > is verified against the known one stored on the volume.
> > 
> > Were there kernel messages about disk I/O errors before that (as opposed
> > to UFS errors about checksums and SU complains) ?
> 
> Hello,
> 
> no, there were no errors before. The small box is updated on a frequent basis, so I'm
> sure there were no errors like those before or any other kind regarding I/O.
> 
> I recall having read the commit description about the UFS2 enhancement.
> 
> The NanoBSD image is created using UFS2/GPT partitioning scheme, if this is important to
> know. 

Try to read the SD card on pre-checksum kernel.  If you can read it, verify
that the files are not damaged.  This is a way to check whether your
SD card or controller provides the wrong data to host.