Test
java/lang/StringBuilder/RacingSBThreads.java
times out when executed
 -XX:TieredStopAtLevel=2/3

Stack dump shows that test is still working, so might be it is too slow when C1 is used.

Part of stack:

"Thread-5" #41 [2977413] prio=5 os_prio=0 cpu=294682.70ms elapsed=301.66s allocated=57363M defined_classes=0 tid=0x00007f65cc041160 nid=2977413 runnable [0x00007f6650421000]
   java.lang.Thread.State: RUNNABLE
Thread: 0x00007f65cc041160 [0x2d6e85] State: _at_safepoint _at_poll_safepoint 1
   JavaThread state: _thread_blocked
at java.lang.StringUTF16.inflate(java.base@25-ea/StringUTF16.java:1593)
at java.lang.StringLatin1.inflate(java.base@25-ea/StringLatin1.java:775)
at java.lang.AbstractStringBuilder.ensureCapacityNewCoder(java.base@25-ea/AbstractStringBuilder.java:288)
at java.lang.AbstractStringBuilder.append(java.base@25-ea/AbstractStringBuilder.java:650)
at java.lang.StringBuilder.append(java.base@25-ea/StringBuilder.java:179)
at RacingSBThreads$Writer.createShrink(RacingSBThreads.java:289)
at RacingSBThreads$Writer.access$300(RacingSBThreads.java:267)
at RacingSBThreads.lambda$stress$0(RacingSBThreads.java:174)
at RacingSBThreads$$Lambda/0x00007f65fb044220.run(Unknown Source)
at java.lang.Thread.runWith(java.base@25-ea/Thread.java:1460)
at java.lang.Thread.run(java.base@25-ea/Thread.java:1447)

   Locked ownable synchronizers:
- None

"Thread-6" #42 [2977414] prio=5 os_prio=0 cpu=294982.99ms elapsed=301.66s allocated=65508M defined_classes=0 tid=0x00007f65cc047760 nid=2977414 runnable [0x00007f6650320000]
   java.lang.Thread.State: RUNNABLE
Thread: 0x00007f65cc047760 [0x2d6e86] State: _at_safepoint _at_poll_safepoint 1
   JavaThread state: _thread_blocked
at java.lang.StringUTF16.inflate(java.base@25-ea/StringUTF16.java:1593)
at java.lang.StringLatin1.inflate(java.base@25-ea/StringLatin1.java:775)
at java.lang.AbstractStringBuilder.inflateToUTF16(java.base@25-ea/AbstractStringBuilder.java:324)
at java.lang.AbstractStringBuilder.appendChars(java.base@25-ea/AbstractStringBuilder.java:2035)
at java.lang.AbstractStringBuilder.append(java.base@25-ea/AbstractStringBuilder.java:764)
at java.lang.StringBuilder.append(java.base@25-ea/StringBuilder.java:218)
at RacingSBThreads$StressKind.lambda$static$2(RacingSBThreads.java:142)
at RacingSBThreads$StressKind$$Lambda/0x00007f65fb041b00.accept(Unknown Source)
at RacingSBThreads$PokeBuilder.readModify(RacingSBThreads.java:234)
at RacingSBThreads$PokeBuilder.access$400(RacingSBThreads.java:205)
at RacingSBThreads.lambda$stress$1(RacingSBThreads.java:175)
at RacingSBThreads$$Lambda/0x00007f65fb044458.run(Unknown Source)
at java.lang.Thread.runWith(java.base@25-ea/Thread.java:1460)
at java.lang.Thread.run(java.base@25-ea/Thread.java:1447)