[plt-scheme] how to trace a segmentation fault?

Hi Matthew -

It didn't take too long to produce a core dump.  It appears to crash at
uncopy_stack in setjumpup.c.

Core was generated by `/usr/local/plt/bin/mzscheme'.
Program terminated with signal 11, Segmentation fault.
#0  uncopy_stack (ok=0, b=0xb3e3ec88, prev=0xbeff511c) at
./../src/setjmpup.c:329
329     {
(gdb) print *b
$1 = {stack_from = 0x0, stack_copy = 0x0, stack_size = 0, stack_max_size =
0, cont = 0x0, buf = {jb = {{jb = {{__jmpbuf = {
              0, 0, 0, 0, 0, 0}, __mask_was_saved = 0, __saved_mask = {__val
= {0 <repeats 32 times>}}}},
        stack_frame = 0}}, gcvs = 0, gcvs_cnt = 0}, gc_var_stack = 0x0,
external_stack = 0x0}
(gdb) print *prev
$2 = 0
(gdb)

Below is the backtrace.  Does this provide you with some details of what
this could be?  What else can I help look for?

This is v4.1.3 if that makes a difference.  Thanks,
yc

#0  uncopy_stack (ok=0, b=0xb3e3ec88, prev=0xbeff511c) at
./../src/setjmpup.c:329
#1  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff547c) at ./../src/setjmpup.c:339
#2  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff57dc) at ./../src/setjmpup.c:339
#3  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff5b3c) at ./../src/setjmpup.c:339
#4  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff5e9c) at ./../src/setjmpup.c:339
#5  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff61fc) at ./../src/setjmpup.c:339
#6  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff655c) at ./../src/setjmpup.c:339
#7  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff68bc) at ./../src/setjmpup.c:339
#8  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff6c1c) at ./../src/setjmpup.c:339
#9  0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbeff6f7c) at ./../src/setjmpup.c:339
..... (repeat) ...
#14542 0x08136967 in uncopy_stack (ok=<value optimized out>, b=0xb3e3ec88,
prev=0xbfbf0844) at ./../src/setjmpup.c:339
#14543 0x081369bc in scheme_longjmpup (b=0xb3e3ec88) at
./../src/setjmpup.c:620
#14544 0x0817a867 in do_swap_thread () at ./../src/thread.c:2516
#14545 0x0817cd8e in scheme_thread_block (sleep_time=0) at
./../src/thread.c:4062
#14546 0x08082b47 in scheme_do_eval (obj=0xadd35778, num_rands=1,
rands=0xbfbf0f7c, get_value=-1) at ./../src/eval.c:7711
#14547 0x0809ddef in apply_k () at ./../src/fun.c:2229
#14548 0x080a7023 in scheme_top_level_do_worker (k=0x809dd70 <apply_k>,
eb=1, new_thread=0, dyn_state=0x0)
    at ./../src/fun.c:2068
#14549 0x080a78a8 in scheme_top_level_do (k=0x809dd70 <apply_k>, eb=1) at
./../src/fun.c:1976
#14550 0x08184316 in do_next_will (w=0xbeff511c) at ./../src/thread.c:6977
#14551 0x081843c0 in will_executor_go (argc=1, argv=0xb4b24fac) at
./../src/thread.c:7045
#14552 0x001128fa in ?? ()
#14553 0x00000001 in ?? ()
#14554 0xb4b24fac in ?? ()
#14555 0x0960ea80 in ?? ()
#14556 0x00622078 in ?? ()
#14557 0xbfbf102c in ?? ()
#14558 0x00000001 in ?? ()
#14559 0x00000000 in ?? ()
(gdb)
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