On Wed, 27 Jan 2021 21:10:16 GMT, Poonam Bajaj <poo...@openjdk.org> wrote:
> Please review this simple change that adds null checks for memory in
> CgroupV1Subsystem.java.
>
> Problem: After the backport of JDK-8250984, there are places where
> memory.isSwapEnabled() is called. For example:
>
> public long getMemoryAndSwapFailCount() {
> if (!memory.isSwapEnabled()) {
> return getMemoryFailCount();
> }
> return SubSystem.getLongValue(memory, "memory.memsw.failcnt");
> }
>
> But memory could be Null on some machines that have cgroup entries for CPU
> but not for memory. This would cause a NullPointerException when memory is
> accessed.
>
> Fix: Add null checks for memory.
I'm curious: What config is this to actually trigger the NPE? How does
`/proc/self/mountinfo`, `/proc/self/cgroup` and `/proc/cgroups` look like?
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PR: https://git.openjdk.java.net/jdk/pull/2269
