"external abort on linefetch (0x814)" on Kirkwood 6282 SoC

[Andrew Lunn]

On Sun, Jul 23, 2017 at 10:25:41AM +0100, Ian Campbell wrote:
> Hello kirkwood folks,
> 
> We have been seeing reports on the Debian arm list about
> instability/errors running Debian Stretch (4.9 based) on
> various Kirkwood 6282 based QNAP systems. Errors are things like [0,
> actually one of the earlier pre-4.9 reports, same symptoms as with 4.9
> though]:
> 
> [   37.167103] BUG: Bad rss-counter state mm:c0caa1e0 idx:1 val:1
> [  783.570365] BUG: Bad rss-counter state mm:c09e6220 idx:1 val:1
> [  800.172223] BUG: Bad rss-counter state mm:ecbc05e0 idx:1 val:1
> [  829.005336] BUG: Bad rss-counter state mm:c0d4b880 idx:1 val:1
> [  871.773956] BUG: Bad rss-counter state mm:c09e63c0 idx:1 val:1
> [ 1299.565344] BUG: Bad rss-counter state mm:ecaf8c40 idx:1 val:1
> 
> and
> 
> [   71.033784] Unhandled fault: external abort on linefetch (0x014) at 0xb6c73db0
> [   71.041037] pgd = ead9c000
> [   71.043747] [b6c73db0] *pgd=3fd72831
> [   84.144056] Unhandled fault: external abort on linefetch (0x014) at 0xb6d44db0
> [...]

Hi Ian

I have a 6282 system i can try to reproduce this on. It will probably
be a few days before i get around to it.

   Andrew