I have also seen a number of systems hang after upgrading to this kernel version. It appears to happen when the system has docker containers running, possibly related to the virtual ethernet devices. On some systems, I can trigger the bug within an hour or two of uptime. Rolling back to 4.19.0-9 resolves the problem. I also tried 4.19.0-11 from buster-proposed-updates on one system, and the system seems to be stable on that kernel as well.

-Mike

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