# HotSpot Virtual Machine Error, assertion failure
This is an assertion failure. The dbx retrace is below. This is from
a fastdebug build on i386. See comments on reproducing this failure.

# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Client VM (1.4-internal-debug mixed mode)
#
# assert(_bt.block_start(p) == p || _bt.is_unallocated(p), "Should be a block boundary")
#
# Error happened during: generation collection for allocation
#
# Error ID: /net/spot/archive02/jmasa/workspaces/main_baseline_nmake/src/share/vm/memory/compactibleFreeListSpace.cpp, 292

current thread: t@5
  [1] _libc_read(0xdfb56df0, 0x8063628, 0xdfb56df0), at 0xdfae9d2c
  [2] _filbuf(0xdfb56df0), at 0xdfb0f4f6
  [3] fgets(0xdee8fbb4, 0x400, 0xdfb56df0), at 0xdfb11491
=>[4] os::message_box(title = ???, message = ???) (optimized), at 0xde67b749 (line ~1837) in "os_solaris.cpp"
  [5] report_error(is_vm_internal_error = ???, file_name = ???, line_no = ???, title = ???, format = ???, ...) (optimized), at 0xde49b68a (line ~337) in "debug.cpp"
  [6] report_assertion_failure(code_str = ???, file_name = ???, line_no = ???, message = ???) (optimized), at 0xde49b0d1 (line ~148) in "debug.cpp"
  [7] CompactibleFreeListSpace::block_is_obj(this = ???, p = ???) (optimized), at 0xde485dd6 (line ~292) in "compactibleFreeListSpace.cpp"
  [8] CardTableModRefBS::verify_space(this = ???, s = ???) (optimized), at 0xde466b97 (line ~520) in "cardTableModRefBS.cpp"
  [9] VerifyCTSpaceClosure::do_space(this = ???, s = ???) (optimized), at 0xde466ece (line ~471) in "cardTableModRefBS.cpp"
  [10] ConcurrentMarkSweepGeneration::space_iterate(this = ???, blk = ???, usedOnly = ???) (optimized), at 0xde488f11 (line ~109) in "concurrentMarkSweepGeneration.cpp"
  [11] GenCollectedHeap::space_iterate(this = ???, cl = ???) (optimized), at 0xde4afce2 (line ~693) in "genCollectedHeap.cpp"
  [12] CardTableModRefBS::verify(this = ???) (optimized), at 0xde4667b6 (line ~477) in "cardTableModRefBS.cpp"
  [13] GenCollectedHeap::verify(this = ???, allow_dirty = ???, silent = ???) (optimized), at 0xde4aff75 (line ~739) in "genCollectedHeap.cpp"
  [14] Universe::verify(allow_dirty = ???, silent = ???) (optimized), at 0xde6fe5c2 (line ~634) in "universe.cpp"
  [15] GenCollectedHeap::do_collection(this = ???, full = ???, clear_all_soft_refs = ???, size = ???, is_large_noref = ???, is_tlab = ???, max_level = ???, notify_ref_lock = ???) (optimized), at 0xde4ae365 (line ~203) in "genCollectedHeap.cpp"
  [16] TwoGenerationCollectorPolicy::satisfy_failed_allocation(this = ???, size = ???, is_large_noref = ???, is_tlab = ???, notify_ref_lock = ???) (optimized), at 0xde4845f2 (line ~193) in "collectorPolicy.cpp"
  [17] GenCollectedHeap::satisfy_failed_allocation(this = ???, size = ???, is_large_noref = ???, is_tlab = ???, notify_ref_lock = ???) (optimized), at 0xde4aea2a (line ~293) in "genCollectedHeap.cpp"
  [18] VM_GenCollectForAllocation::doit(this = ???) (optimized), at 0xde72ad42 (line ~117) in "vm_operations.cpp"
  [19] VM_Operation::evaluate(this = ???) (optimized), at 0xde72a71b (line ~34) in "vm_operations.cpp"
  [20] VMThread::evaluate_operation(this = ???, op = ???) (optimized), at 0xde7292ff (line ~246) in "vmThread.cpp"
  [21] VMThread::loop(this = ???) (optimized), at 0xde7297a1 (line ~322) in "vmThread.cpp"
  [22] VMThread::run(this = ???) (optimized), at 0xde729015 (line ~187) in "vmThread.cpp"
  [23] _start(data = ???) (optimized), at 0xde6786f9 (line ~494) in "os_solaris.cpp"