RFR: 8255908: ExceptionInInitializerError due to UncheckedIOException while initializing cgroupv1 subsystem

[Poonam Bajaj]

On Thu, 19 Nov 2020 14:36:53 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Hi,
>> 
>> Please review this simple change that catches UncheckedIOException that can occur if /proc/self/cgroup or /proc/self/mountinfo files don't exist on the system, or if there is an interrupt while these are being read.
>> 
>> Testing: Tier1, Tier2 and Tier3.
>> 
>> Thanks,
>> Poonam
>
> src/java.base/linux/classes/jdk/internal/platform/CgroupUtil.java line 50:
> 
>> 48:             throw new InternalError(e.getCause());
>> 49:         } catch (UncheckedIOException e) {
>> 50:             throw e.getCause();
> 
> There are other reader methods in the same file, should this block be added to them as well?

This change takes care of the case when reading of files /proc/self/cgroup or /proc/self/mountinfo might fail due to some reason that can cause the initialization of cgroupv1 subsystem (initSubSystem) to fail. Looking at the usages of other reader methods, I think it makes sense to catch UncheckedIOException there as well.

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PR: https://git.openjdk.java.net/jdk/pull/1303