#0  0xf7fc7589 in __kernel_vsyscall ()
#1  0xf7c8a2e7 in ?? () from /lib/i386-linux-gnu/libc.so.6
#2  0xf7c39111 in raise () from /lib/i386-linux-gnu/libc.so.6
#3  0x56656273 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647)
    at emacs.c:480
#4  0x566f65f0 in die (
    msg=0x568a6ec8 "i < nailboardLevelBits(nailboardNails(board), level)", 
    file=0x568a7064 "nailboard.c", line=205) at alloc.c:8334
#5  0x567c3a8a in igc_assert_fail (file=0x568a7064 "nailboard.c", line=205, 
    msg=0x568a6ec8 "i < nailboardLevelBits(nailboardNails(board), level)")
    at igc.c:84
#6  0x5684aa0a in mps_lib_assert_fail (file=0x568a7064 "nailboard.c", 
    line=205, 
    condition=0x568a6ec8 "i < nailboardLevelBits(nailboardNails(board), level)") at mpsliban.c:87
#7  0x5685829f in nailboardIndex (board=board@entry=0xe803eb14, 
    level=level@entry=2, addr=addr@entry=0xf79b6087) at nailboard.c:205
#8  0x568582d5 in nailboardIndexRange (
    ibaseReturn=ibaseReturn@entry=0xffffcbac, 
    ilimitReturn=ilimitReturn@entry=0xffffcba8, board=board@entry=0xe803eb14, 
    level=2, base=0xf79b5bf8, limit=0xf79b6088) at nailboard.c:232
#9  0x56858bf9 in NailboardIsResRange (board=<optimized out>, base=0xf79b5bf8, 
    limit=0xf79b6088) at nailboard.c:350
(More stack frames follow...)
(gdb) ba
#0  0xf7fc7589 in __kernel_vsyscall ()
#1  0xf7c8a2e7 in ?? () from /lib/i386-linux-gnu/libc.so.6
#2  0xf7c39111 in raise () from /lib/i386-linux-gnu/libc.so.6
#3  0x56656273 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647)
    at emacs.c:480
#4  0x566f65f0 in die (
    msg=0x568a6ec8 "i < nailboardLevelBits(nailboardNails(board), level)", 
    file=0x568a7064 "nailboard.c", line=205) at alloc.c:8334
#5  0x567c3a8a in igc_assert_fail (file=0x568a7064 "nailboard.c", line=205, 
    msg=0x568a6ec8 "i < nailboardLevelBits(nailboardNails(board), level)")
    at igc.c:84
#6  0x5684aa0a in mps_lib_assert_fail (file=0x568a7064 "nailboard.c", 
    line=205, 
    condition=0x568a6ec8 "i < nailboardLevelBits(nailboardNails(board), level)") at mpsliban.c:87
#7  0x5685829f in nailboardIndex (board=board@entry=0xe803eb14, 
    level=level@entry=2, addr=addr@entry=0xf79b6087) at nailboard.c:205
#8  0x568582d5 in nailboardIndexRange (
    ibaseReturn=ibaseReturn@entry=0xffffcbac, 
    ilimitReturn=ilimitReturn@entry=0xffffcba8, board=board@entry=0xe803eb14, 
    level=2, base=0xf79b5bf8, limit=0xf79b6088) at nailboard.c:232
#9  0x56858bf9 in NailboardIsResRange (board=<optimized out>, base=0xf79b5bf8, 
    limit=0xf79b6088) at nailboard.c:350
#10 0x568441b2 in amcPinnedInterior (amc=0xe8000250, board=0xe803eb14, 
    base=0xf79b5bf8, limit=0xf79b6088) at poolamc.c:681
#11 0x56842ad6 in amcSegFix (seg=0xe80292f4, ss=0xffffce14, refIO=0xffffccbc)
    at poolamc.c:1604
#12 0x56829d25 in SegFix (seg=0xe80292f4, ss=0xffffce14, refIO=0xffffccbc)
    at seg.c:793
#13 0x5683762b in _mps_fix2 (mps_ss=0xffffce18, mps_ref_io=0xffffccf0)
    at trace.c:1433
#14 0x567c4152 in fix_lisp_obj (ss=0xffffce18, pobj=0x56cbcaac <echo_buffer+4>)
    at igc.c:434
#15 0x567c437a in scan_staticvec (ss=0xffffce18, start=0x56d0a2a0 <staticvec>, 
    end=0x56d0c2a0 <staticidx>, closure=0x0) at igc.c:540
#16 0x56837da8 in TraceScanArea (ss=0xffffce14, base=0x56d0a2a0 <staticvec>, 
    limit=0x56d0c2a0 <staticidx>, scan_area=0x567c42ff <scan_staticvec>, 
    closure=0x0) at trace.c:1566
#17 0x56823cce in RootScan (ss=0xffffce14, root=0xe80009a0) at root.c:540
#18 0x568354ae in traceScanRootRes (ts=ts@entry=1, rank=rank@entry=1, 
    arena=arena@entry=0xf7fc0000, root=0xe80009a0) at trace.c:528
#19 0x56835670 in traceScanRoot (root=0xe80009a0, arena=0xf7fc0000, rank=1, 
    ts=1) at trace.c:545
#20 rootFlip (root=0xe80009a0, p=0xffffcf30) at trace.c:580
#21 0x568240bd in RootsIterate (arena=0xf7fc0004, f=0x568354d4 <rootFlip>, 
    p=0xffffcf30) at root.c:665
#22 0x56838678 in traceFlip (trace=0xf7fc04fc) at trace.c:652
#23 TraceStart (trace=0xf7fc04fc, mortality=0.79999994469287583, 
    finishingTime=255124633) at trace.c:1694
#24 0x568392bf in TraceStartCollectAll (traceReturn=0xffffcfec, 
    arena=<optimized out>, why=4) at trace.c:1794
#25 0x5683a974 in ArenaStartCollect (globals=0xf7fc0004, why=4)
    at traceanc.c:634
#26 0x5683a9ed in ArenaCollect (globals=0xf7fc0004, why=4) at traceanc.c:652
#27 0x56812d12 in mps_arena_collect (arena=0xf7fc0000) at mpsi.c:313
#28 0x567c8aad in igc_collect () at igc.c:2520
#29 0x567c8adc in Figc__collect () at igc.c:2528
#30 0x5672eede in eval_sub (form=0xe8b1aedb) at eval.c:2532
#31 0x5672e674 in Feval (form=0xe8b1aedb, lexical=0x18) at eval.c:2396
#32 0x567307f8 in funcall_subr (subr=0x56cb9a80 <Seval>, numargs=2, 
    args=0xe722d0e8) at eval.c:3102
#33 0x5678344a in exec_byte_code (fun=0xe756f4c5, args_template=513, nargs=1, 
    args=0xe722d19c) at bytecode.c:829
#34 0x56730e30 in funcall_lambda (fun=0xe77adced, nargs=0, 
    arg_vector=0xffffd580) at eval.c:3200
#35 0x56730c3d in apply_lambda (fun=0xe77adced, args=0x0, count=64)
    at eval.c:3154
#36 0x5672f19b in eval_sub (form=0xe78791cb) at eval.c:2582
#37 0x5672e674 in Feval (form=0xe78791cb, lexical=0x18) at eval.c:2396
#38 0x5665e2c0 in top_level_2 () at keyboard.c:1184
#39 0x5672c526 in internal_condition_case (bfun=0x5665e244 <top_level_2>, 
    handlers=0x48, hfun=0x5665d980 <cmd_error>) at eval.c:1544
#40 0x5665e328 in top_level_1 (ignore=0x0) at keyboard.c:1196
#41 0x5672b9e0 in internal_catch (tag=0x71d0, func=0x5665e2db <top_level_1>, 
    arg=0x0) at eval.c:1224
#42 0x5665e160 in command_loop () at keyboard.c:1145
#43 0x5665d3df in recursive_edit_1 () at keyboard.c:754
#44 0x5665d63f in Frecursive_edit () at keyboard.c:837
#45 0x56658f1d in main (argc=3, argv=0xffffd9b4) at emacs.c:2626