During stress testing of the fix for the following bug:

    6432598 3/3 SEGV in forte backtrace walker under collect command

the fastdebug bits failed the following assertion:

# Internal Error (src/share/vm/memory/allocation.cpp, 44 [ Patched ]), pid=14601, tid=3
#
# Java VM: Java HotSpot(TM) Client VM (mustang-fastdebug-debug mixed mode)
#
# Error: assert(((ResourceObj *)p)->allocated_on_C_heap(),"delete only allowed for C_HEAP objects")

Here is the relevant part of the stack trace:

  [6] report_assertion_failure(file_name = ???, line_no = ???, message = ???) (optimized), at 0xfdbba220 (line ~210) in "debug.cpp"
  [7] ResourceObj::operator delete(p = ???) (optimized), at 0xfd861b88 (line ~44) in "allocation.cpp"
  [8] jvmpi::post_class_unload_events() (optimized), at 0xfdf45e20 (line ~942) in "jvmpi.cpp"
  [9] GenCollectedHeap::do_collection(this = ???, full = ???, clear_all_soft_refs = ???, size = ???, is_tlab = ???, max_level = ???) (optimized), at 0xfdc3331c
(line ~609) in "genCollectedHeap.cpp"
  [10] GenCollectedHeap::do_full_collection(this = ???, clear_all_soft_refs = ???, max_level = ???) (optimized), at 0xfdc34c40 (line ~810) in "genCollectedHeap.cpp"
  [11] VM_GenCollectFull::doit(this = ???) (optimized), at 0xfe5a4188 (line ~117) in "vmGCOperations.cpp"
  [12] VM_Operation::evaluate(this = ???) (optimized), at 0xfe5cc06c (line ~25)
in "vm_operations.cpp"
  [13] VMThread::evaluate_operation(this = ???, op = ???) (optimized), at 0xfe5ca274 (line ~314) in "vmThread.cpp"
  [14] VMThread::loop(this = ???) (optimized), at 0xfe5caa64 (line ~423) in "vmThread.cpp"
  [15] VMThread::run(this = ???) (optimized), at 0xfe5c9d74 (line ~227) in "vmThread.cpp"

I have attached the complete thread dump as threads.log.9.