> This call trace looks unreliable. All function names are prefixed with
> '?'.
> I'd suggest you to try reviewing your kernel configuration or compile
> option.

I will do that.

> If you enable CONFIG_AUFS_DEBUG and CONFIG_MAGIC_SYSRQ, then you will
> get more information by pressing Alt+Sysrq+ d, t, w and a.

Thanks. I'll generate another debug log. This issue happens after many
hours of the system running, so I will report in another few hours.

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