on a number of our Linux test machines, this jtreg test times out after 720 secs. We see this on various architectures, including x64.

Stack:
```
"MainThread" #26 prio=5 os_prio=0 cpu=719540.42ms elapsed=720.16s tid=0x00007f5a032d7b70 nid=0x5994 runnable [0x00007f59dc149000]
   java.lang.Thread.State: RUNNABLE
Thread: 0x00007f5a032d7b70 [0x5994] State: _at_safepoint _at_poll_safepoint 0
   JavaThread state: _thread_blocked
at java.util.regex.Pattern$Curly.match1(java.base@17.0.0.1-internal/Pattern.java:4433)
at java.util.regex.Pattern$Curly.match(java.base@17.0.0.1-internal/Pattern.java:4382)
at java.util.regex.Pattern$GroupTail.match(java.base@17.0.0.1-internal/Pattern.java:4836)
at java.util.regex.Pattern$BmpCharPropertyGreedy.match(java.base@17.0.0.1-internal/Pattern.java:4345)
at java.util.regex.Pattern$GroupHead.match(java.base@17.0.0.1-internal/Pattern.java:4805)
at java.util.regex.Pattern$BmpCharProperty.match(java.base@17.0.0.1-internal/Pattern.java:3971)
at java.util.regex.Pattern$GroupTail.match(java.base@17.0.0.1-internal/Pattern.java:4836)
at java.util.regex.Pattern$BmpCharPropertyGreedy.match(java.base@17.0.0.1-internal/Pattern.java:4345)
at java.util.regex.Pattern$GroupHead.match(java.base@17.0.0.1-internal/Pattern.java:4805)
at java.util.regex.Pattern$Start.match(java.base@17.0.0.1-internal/Pattern.java:3624)
at java.util.regex.Matcher.search(java.base@17.0.0.1-internal/Matcher.java:1728)
at java.util.regex.Matcher.find(java.base@17.0.0.1-internal/Matcher.java:745)
at java.util.Scanner$FindSpliterator.nextInBuffer(java.base@17.0.0.1-internal/Scanner.java:2996)
at java.util.Scanner$FindSpliterator.tryAdvance(java.base@17.0.0.1-internal/Scanner.java:2970)
at java.util.Spliterator.forEachRemaining(java.base@17.0.0.1-internal/Spliterator.java:326)
at java.util.stream.ReferencePipeline$Head.forEach(java.base@17.0.0.1-internal/ReferencePipeline.java:762)
at TestTracePageSizes.parseSmaps(TestTracePageSizes.java:110)
at TestTracePageSizes.main(TestTracePageSizes.java:165)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@17.0.0.1-internal/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@17.0.0.1-internal/NativeMethodAccessorImpl.java:78)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@17.0.0.1-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@17.0.0.1-internal/Method.java:568)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.lang.Thread.run(java.base@17.0.0.1-internal/Thread.java:831)
```