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sys-kernel: fix overlayfs Docker breakage in 5.2+ #50
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Kernel 5.2+ has a bug in overlayfs so that mount leaks lead to umount errors.
Fix the issue by temporarily disabling the check
ovl_is_inuse()
in the kernel.See also:
coreos/linux#339
containers/podman#3540
moby/moby#39475
Also upgrade kernel to 5.2.1.