We have sporadically seen "assert(!(((ThreadShadow*)__the_thread__)->has_pending_exception())) failed: Should not have any exceptions pending" on s390 while running jtreg test "vmTestbase/nsk/jvmti/scenarios/capability/CM03/cm03t001".
The VM asserts that no exception is pending after a backedge counter overflow. The unexpected pending exception found in frequency_counter_overflow_inner is an instance of java.lang.ThreadDeath which got installed asynchronously by the test via JVMTI StopThread.
The VM call to InterpreterRuntime::build_method_counters misses an exception check in the s390 implementation. This is necessary for asynchronous exceptions which get installed by this test.

Stack:
V [libjvm.so+0xb78cd4] InterpreterRuntime::frequency_counter_overflow_inner(JavaThread*, unsigned char*)+0x1cc
V [libjvm.so+0xb79368] InterpreterRuntime::frequency_counter_overflow(JavaThread*, unsigned char*)+0x28
j nsk.jvmti.scenarios.capability.CM03.cm03t001Thread.waitUntilQuit()V+2
j nsk.jvmti.scenarios.capability.CM03.cm03t001Thread.delay()V+10
j nsk.jvmti.scenarios.capability.CM03.cm03t001Thread.run()V+35