On AIX, track_as_vm() returns false [https://github.com/openjdk/jdk/blob/master/src/hotspot/share/services/memReporter.cpp#L225] which causes it to move to else part and prints “Stack: “, but the test is expecting the pattern : ".*stack: reserved=(\\d+), committed=(\\d+).*”.

stdout: [Alive: 2
Alive: 7
Alive: 4
Alive: 1
Alive: 0
Alive: 15
Alive: 11
Alive: 14
Alive: 12
Alive: 9
Alive: 13
Alive: 8
Alive: 10
Alive: 5
Alive: 6
Alive: 3

Native Memory Tracking:

Total: reserved=219152338, committed=219152338
       malloc: 219152338 #54209
       mmap: reserved=0, committed=0

- Class (reserved=124465, committed=124465)
                            (classes #769)
                            ( instance classes #662, array classes #107)
                            (malloc=124465 #1877) (peak=124657 #1867)
                            ( Metadata: )
                            ( reserved=67108864, committed=5767168)
                            ( used=5649248)
                            ( waste=117920 =2.04%)
                            ( Class space:)
                            ( reserved=1073741824, committed=524288)
                            ( used=476976)
                            ( waste=47312 =9.02%)
 
- Thread (reserved=181151776, committed=181151776)
                            (thread #33)
                            (Stack: 181037448)
                            (malloc=76048 #221) (peak=84656 #226)
                            (arena=38280 #67) (peak=272664 #26)
 
- Code (reserved=761752, committed=761752)
                            (malloc=761752 #22964) (peak=761872 #22970)
                            (arena=0 #0) (peak=984 #1)
 
- GC (reserved=27922954, committed=27922954)
                            (malloc=27922954 #658) (peak=27923042 #656)
 
- GCCardSet (reserved=29928, committed=29928)
                            (malloc=29928 #387) (at peak)
 
- Compiler (reserved=209820, committed=209820)
                            (malloc=6564 #56) (peak=6700 #57)
                            (arena=203256 #7) (peak=4603120 #15)
 
- Internal (reserved=703467, committed=703467)
                            (malloc=703467 #20791) (peak=705041 #20801)
 
- Symbol (reserved=2853042, committed=2853042)
                            (malloc=978914 #3895) (at peak)
                            (arena=1874128 #1) (at peak)
 
- Native Memory Tracking (reserved=870288, committed=870288)
                            (malloc=2944 #29) (peak=3024 #30)
                            (tracking overhead=867344)
 
- Arena Chunk (reserved=4141992, committed=4141992)
                            (malloc=4141992 #257) (peak=6517056 #258)
 
- Tracing (reserved=313, committed=313)
                            (malloc=313 #9) (at peak)
 
- Statistics (reserved=128, committed=128)
                            (malloc=128 #2) (at peak)
 
- Arguments (reserved=77, committed=77)
                            (malloc=77 #4) (at peak)
 
- Module (reserved=200536, committed=200536)
                            (malloc=200536 #2055) (at peak)
 
- Synchronization (reserved=150912, committed=150912)
                            (malloc=150912 #943) (at peak)
 
- Serviceability (reserved=17080, committed=17080)
                            (malloc=17080 #9) (peak=17416 #13)
 
- Metaspace (reserved=12864, committed=12864)
                            (malloc=12864 #10) (at peak)
 
- String Deduplication (reserved=608, committed=608)
                            (malloc=608 #8) (at peak)
 
- Object Monitors (reserved=336, committed=336)
                            (malloc=336 #1) (at peak)
 
];
 stderr: []
 exitValue = 0

java.lang.RuntimeException: Did not find expected NMT output
        at TestAlwaysPreTouchStacks.main(TestAlwaysPreTouchStacks.java:149)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
        at java.base/java.lang.Thread.run(Thread.java:1570)

JavaTest Message: Test threw exception: java.lang.RuntimeException
JavaTest Message: shutting down test