One test crashed with

# Internal Error (/open/src/hotspot/os/posix/signals_posix.cpp:1680), pid=73381, tid=192627
# assert(thread->is_VM_thread() || thread->is_Java_thread()) failed: Must be VMThread or JavaThread
#
# JRE version: Java(TM) SE Runtime Environment (26.0+27) (fastdebug build 26-ea+27-2778)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 26-ea+27-2778, mixed mode, tiered, compressed class ptrs, z gc, bsd-aarch64)


Current thread (0x0000000bae969e10): Thread "Unknown thread" [id=192627, stack(0x00000004ce428000,0x00000004ce62b000) (2060K)]

Stack: [0x00000004ce428000,0x00000004ce62b000], sp=0x00000004ce62a6e0, free space=2057k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x12744c4] VMError::report(outputStream*, bool)+0x1b70 (signals_posix.cpp:1680)
V [libjvm.dylib+0x1277dc8] VMError::report_and_die(int, char const*, char const*, char*, Thread*, unsigned char*, void const*, void const*, char const*, int, unsigned long)+0x55c
V [libjvm.dylib+0x5e4be4] print_error_for_unit_test(char const*, char const*, char*)+0x0
V [libjvm.dylib+0x1064dc0] set_signal_handler(int)+0x0
C [libsystem_platform.dylib+0x3744] _sigtramp+0x38
C [libsystem_malloc.dylib+0x2a8a0] _xzm_free+0x15c
V [libjvm.dylib+0x11b4068] Thread::~Thread()+0x68
V [libjvm.dylib+0x94e07c] JavaThread::~JavaThread()+0xc
V [libjvm.dylib+0x11bd0a0] ThreadsSMRSupport::smr_delete(JavaThread*)+0x58
V [libjvm.dylib+0x11b3ed8] Thread::call_run()+0x134
V [libjvm.dylib+0xf01a98] thread_native_entry(Thread*)+0x138
C [libsystem_pthread.dylib+0x6c08] _pthread_start+0x88

when running on macosx-aarch64-26.