The jtreg test
gc/stress/gcold/TestGCOldWithShenandoah.java#generational
 
triggers sometimes this issue :
 
# Internal Error (d:\priv\jenkins\client-home\workspace\openjdk-jdk-dev-windows_x86_64-dbg\jdk\src\hotspot\share\gc\shenandoah\shenandoahVerifier.cpp:454), pid=35284, tid=18196
# guarantee(stats.non_trashed_span() <= generation_capacity) failed: Before Mark: generation (Young) size spanned by regions (1244) * region size (256K) must not exceed current capacity (308M)
 
Stack: [0x000000a40aa00000,0x000000a40ab00000], sp=0x000000a40aafeeb0, free space=1019k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0xfbe93f] ShenandoahGenerationStatsClosure::validate_usage+0x1cf (shenandoahVerifier.cpp:450)
V [jvm.dll+0xfbf47f] ShenandoahVerifier::verify_at_safepoint+0x54f (shenandoahVerifier.cpp:935)
V [jvm.dll+0xfbfcdd] ShenandoahVerifier::verify_before_concmark+0x4d (shenandoahVerifier.cpp:1070)
V [jvm.dll+0xec352c] ShenandoahConcurrentGC::op_init_mark+0x23c (shenandoahConcurrentGC.cpp:649)
V [jvm.dll+0xec1c93] ShenandoahConcurrentGC::entry_init_mark+0x133 (shenandoahConcurrentGC.cpp:303)
V [jvm.dll+0xfaf39a] VM_ShenandoahInitMark::doit+0x3a (shenandoahVMOperations.cpp:85)
V [jvm.dll+0x1199844] VM_Operation::evaluate+0xe4 (vmOperations.cpp:76)
V [jvm.dll+0x119b578] VMThread::evaluate_operation+0xb8 (vmThread.cpp:284)
V [jvm.dll+0x119bc9f] VMThread::inner_execute+0x24f (vmThread.cpp:430)
V [jvm.dll+0x119c2c4] VMThread::run+0x114 (vmThread.cpp:177)
V [jvm.dll+0x10ee476] Thread::call_run+0x1a6 (thread.cpp:237)
V [jvm.dll+0xd86921] thread_native_entry+0xe1 (os_windows.cpp:545)
C [ucrtbase.dll+0x1fb80] (no source info available)
C [KERNEL32.DLL+0x84d4] (no source info available)
C [ntdll.dll+0x51a11] (no source info available)