Hi,
I'm getting a segfault when running Mx, in
buildtools/Mx/Code.c, CodeSubBlk().
The symptom is around line 305---s[-1]
is not accessible memory.
Any suggestions for how to debug/fix this?
I got as far as looking at def in the parent
frame (CodeSub()):
(gdb) print *def
$9 = {
d_dir = Mxmacro,
d_cmd = 0x8592e110 "DEFseqscan",
d_blk = 0x89ca2000 "@:defseqsc...@[10](@1,@2,@3,@4,@5,@6,@7,@8,@9)@\n",
d_mod = 0,
d_sec = 0,
d_cms = 0xd0d0d0d0 <Address 0xd0d0d0d0 out of bounds>,
d_file = 0x86c3a080 "gdk_scanselect_defs.mx",
d_line = 132
}
(gdb)
This is the Feb2010 branch, on OpenBSD 4.6 with the
following malloc.conf options:
A ``Abort''. malloc() will coredump the process, rather than tol-
erate internal inconsistencies or incorrect usage. This is the
default and a very handy debugging aid, since the core file rep-
resents the time of failure, rather than when the bogus pointer
was used.
G ``Guard''. Enable guard pages. Each page size or larger alloca-
tion is followed by a guard page that will cause a segmentation
fault upon any access.
J ``Junk''. Fill some junk into the area allocated. Currently
junk is bytes of 0xd0 when allocating; this is pronounced
``Duh''. :-) Freed chunks are filled with 0xdf.
P ``Move allocations within a page.'' Allocations larger than half
a page but smaller than a page are aligned to the end of a page
to catch buffer overruns in more cases. This is the default.
I was getting these when building Nov2009, but I was
able to get past them by restarting the build multiple
times.
I'd like to fix it this time around. Fortunately, after a
gmake clean the crash is reproduceable.
Thanks,
m
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