Hidden division by zero in examples/basic-actor.c
- From: Serge Kosyrev <skosyrev ptsecurity ru>
- To: <clutter-list gnome org>
- Cc: sbcl-devel lists sourceforge net
- Subject: Hidden division by zero in examples/basic-actor.c
- Date: Wed, 28 Aug 2013 20:04:50 +0400
Good day, folks!
[cc-ing sbcl-devel..]
During execution of basic-actor.c from clutter 1.14.4, during the first
entry of the mouse pointer into the application window, there is a
hidden division by zero, as is suggested by several following gdb
session pieces pasted together -- when info->max_value equals
info->min_value.
The question is whether this division-by-zero accompanied by the SIGFPE
suppression is the intended mode of operation.
The real issue is that when the libclutter code is called from within a
different environment (runtime of the SBCL Common Lisp implementation),
the SIGFPE, corresponding to this division by zero, is actually raised.
[deepfire betelheise cffi-clutter]$ gcc basic-actor.c -o basic-actor -I/usr/include/clutter-1.0/clutter
-I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/pango-1.0 -I/usr/include/atk-1.0
-I/usr/include/glib-2.0 -I/usr/include/json-glib-1.0 -I/usr/lib64/glib-2.0/include -I/usr/include/cairo
-I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/pixman-1 -lclutter-1.0 -lglib-2.0
-lgobject-2.0
[deepfire betelheise cffi-clutter]$ gdb ./basic-actor
GNU gdb (GDB) Fedora (7.6-34.fc19)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/deepfire/src/cffi-clutter/basic-actor...done.
(gdb) b _clutter_input_device_translate_axis
Function "_clutter_input_device_translate_axis" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (_clutter_input_device_translate_axis) pending.
(gdb) run
Starting program: /home/deepfire/src/cffi-clutter/basic-actor
Traceback (most recent call last):
File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.3600.3-gdb.py", line 9, in <module>
from gobject import register
File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
import gdb.backtrace
ImportError: No module named backtrace
Traceback (most recent call last):
File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.3600.3-gdb.py", line 9, in <module>
from gobject import register
File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
import gdb.backtrace
ImportError: No module named backtrace
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Missing separate debuginfo for /lib64/libgraphite2.so.3
Try: yum --disablerepo='*' --enablerepo='*debug*' install
/usr/lib/debug/.build-id/a1/aa32c91bc181cb69ebc81bbfd03a1349ea4e33.debug
[New Thread 0x7fffef7fd700 (LWP 499)]
Breakpoint 1, _clutter_input_device_translate_axis (device=device entry=0x7341a0, index_=index_ entry=0,
value=633.43291059019975,
axis_value=axis_value entry=0x6e8580) at ./clutter-input-device.c:1193
1193 if (device->axes == NULL || index_ >= device->axes->len)
Missing separate debuginfos, use: debuginfo-install atk-2.8.0-1.fc19.x86_64 cairo-1.12.14-2.fc19.x86_64
cairo-gobject-1.12.14-2.fc19.x86_64 cogl-1.14.0-3.fc19.x86_64 elfutils-libelf-0.156-3.fc19.x86_64
expat-2.1.0-5.fc19.x86_64 fontconfig-2.10.93-1.fc19.x86_64 freetype-2.4.11-6.fc19.x86_64
gdk-pixbuf2-2.28.2-1.fc19.x86_64 glib2-2.36.3-3.fc19.x86_64 glibc-2.17-13.fc19.x86_64
gtk3-3.8.2-2.fc19.x86_64 harfbuzz-0.9.19-1.fc19.x86_64 json-glib-0.16.0-1.fc19.x86_64
libX11-1.6.0-1.fc19.x86_64 libXau-1.0.8-1.fc19.x86_64 libXcomposite-0.4.4-3.fc19.x86_64
libXcursor-1.1.14-1.fc19.x86_64 libXdamage-1.1.4-3.fc19.x86_64 libXext-1.3.2-1.fc19.x86_64
libXfixes-5.0.1-1.fc19.x86_64 libXi-1.7.2-1.fc19.x86_64 libXinerama-1.1.3-1.fc19.x86_64
libXrandr-1.4.1-1.fc19.x86_64 libXrender-0.9.7-6.20130524git786f78fd8.fc19.x86_64
libXxf86vm-1.1.3-1.fc19.x86_64 libdrm-2.4.46-1.fc19.x86_64 libffi-3.0.13-4.fc19.x86_64
libgcc-4.8.1-1.fc19.x86_64 libpng-1.5.13-2.fc19.x86_64 libselinux-2.1.13-15.fc19.x86_64
libstdc++-4.8.1-1.fc19.x86_64 libwayland-client-1.2.0-1.fc19.x86_64 libwayland-cursor-1.2.0-1.fc19.x86_64
libwayland-server-1.2.0-1.fc19.x86_64 libxcb-1.9-3.fc19.x86_64 libxkbcommon-0.3.0-1.fc19.x86_64
llvm-libs-3.3-0.6.rc3.fc19.x86_64 mesa-dri-drivers-9.2-0.14.20130723.fc19.x86_64
mesa-libEGL-9.2-0.14.20130723.fc19.x86_64 mesa-libGL-9.2-0.14.20130723.fc19.x86_64
mesa-libgbm-9.2-0.14.20130723.fc19.x86_64 mesa-libglapi-9.2-0.14.20130723.fc19.x86_64
pango-1.34.1-1.fc19.x86_64 pcre-8.32-7.fc19.x86_64 pixman-0.30.0-1.fc19.x86_64 systemd-libs-204-9.fc19.x86_64
zlib-1.2.7-10.fc19.x86_64
(gdb) bt
#0 _clutter_input_device_translate_axis (device=device entry=0x7341a0, index_=index_ entry=0,
value=<optimized out>,
axis_value=axis_value entry=0x6e8580) at ./clutter-input-device.c:1208
#1 0x000000385763a54b in translate_axes (device=0x7341a0, x=632.43292236328125, y=328.77923583984375,
valuators=valuators entry=0x853780,
stage_x11=<optimized out>) at x11/clutter-device-manager-xi2.c:638
#2 0x000000385763b279 in clutter_device_manager_xi2_translate_event (translator=<optimized out>,
native=<optimized out>, event=0x62f430)
at x11/clutter-device-manager-xi2.c:1058
#3 0x000000385765b2cc in clutter_backend_real_translate_event (backend=<optimized out>,
native=0x7fffffffdce0, event=0x62f430)
at ./clutter-backend.c:572
#4 0x0000003857635df0 in events_queue (backend_x11=0x614080) at x11/clutter-event-x11.c:293
#5 clutter_event_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at
x11/clutter-event-x11.c:317
#6 0x000000382e447e06 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#7 0x000000382e448158 in g_main_context_iterate.isra.22 () from /lib64/libglib-2.0.so.0
#8 0x000000382e44855a in g_main_loop_run () from /lib64/libglib-2.0.so.0
#9 0x000000385768317d in clutter_main () at ./clutter-main.c:980
#10 0x00000000004018c8 in main (argc=1, argv=0x7fffffffe028) at basic-actor.c:150
(gdb) next
1194 return FALSE;
(gdb) next
1193 if (device->axes == NULL || index_ >= device->axes->len)
(gdb) next
1196 info = &g_array_index (device->axes, ClutterAxisInfo, index_);
(gdb) next
1198 if (info->axis == CLUTTER_INPUT_AXIS_X ||
(gdb) next
1202 width = info->max_value - info->min_value;
(gdb) next
1207 if (axis_value)
(gdb) next
1202 width = info->max_value - info->min_value;
(gdb) next
1203 real_value = (info->max_axis * (value - info->min_value)
(gdb) next
1204 + info->min_axis * (info->max_value - value))
(gdb) next
1202 width = info->max_value - info->min_value;
(gdb) next
1203 real_value = (info->max_axis * (value - info->min_value)
(gdb) next
1204 + info->min_axis * (info->max_value - value))
(gdb) next
1203 real_value = (info->max_axis * (value - info->min_value)
(gdb) next
1204 + info->min_axis * (info->max_value - value))
(gdb) next
1203 real_value = (info->max_axis * (value - info->min_value)
(gdb) next
1207 if (axis_value)
(gdb) next
1208 *axis_value = real_value;
(gdb) printf "%f %f %f %f\n", info->min_axis, info->max_axis, info->min_value, info->max_value
0.000000 1.000000 -1.000000 -1.000000
(gdb) info registers all
rax 0x0 0
rbx 0x0 0
rcx 0x822420 8528928
rdx 0x6e8580 7243136
rsi 0xffffffff 4294967295
rdi 0x611060 6361184
rbp 0x853780 0x853780
rsp 0x7fffffffdbc8 0x7fffffffdbc8
r8 0x823900 8534272
r9 0x0 0
r10 0x0 0
r11 0x382e44daf0 241294433008
r12 0x6e8580 7243136
r13 0x7341a0 7553440
r14 0x8537e8 8730600
r15 0x8537e8 8730600
rip 0x385767aad3 0x385767aad3 <_clutter_input_device_translate_axis+99>
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
st0 0 (raw 0x00000000000000000000)
st1 0 (raw 0x00000000000000000000)
st2 0 (raw 0x00000000000000000000)
st3 0 (raw 0x00000000000000000000)
st4 0 (raw 0x00000000000000000000)
st5 0 (raw 0x00000000000000000000)
st6 0 (raw 0x00000000000000000000)
st7 0 (raw 0x00000000000000000000)
fctrl 0x37f 895
fstat 0x0 0
ftag 0xffff 65535
fiseg 0x0 0
fioff 0x0 0
foseg 0x0 0
fooff 0x0 0
fop 0x0 0
xmm0 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x80, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x8000, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0,
0x80000000, 0x0, 0x0}, v2_int64 = {
0x8000000000000000, 0x0}, uint128 = 0x00000000000000008000000000000000}
xmm1 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x8000000000000000, 0x0}, v16_int8 = {0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0xf0, 0x7f,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x7ff0, 0x0, 0x0, 0x0, 0x0}, v4_int32
= {0x0, 0x7ff00000, 0x0, 0x0},
v2_int64 = {0x7ff0000000000000, 0x0}, uint128 = 0x00000000000000007ff0000000000000}
xmm2 {v4_float = {0x0, 0xffffffff, 0x0, 0x0}, v2_double = {0xffffffffffffffff, 0x0}, v16_int8 =
{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf0,
0xbf, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0xbff0, 0x0, 0x0, 0x0, 0x0},
v4_int32 = {0x0, 0xbff00000, 0x0,
0x0}, v2_int64 = {0xbff0000000000000, 0x0}, uint128 = 0x0000000000000000bff0000000000000}
xmm3 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm4 {v4_float = {0x0, 0xfffffffc, 0x0, 0x0}, v2_double = {0xfffffffffffffd86, 0x0}, v16_int8 =
{0x0, 0xd8, 0xd3, 0x99, 0x76, 0xd3,
0x83, 0xc0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xd800, 0x99d3, 0xd376, 0xc083, 0x0,
0x0, 0x0, 0x0}, v4_int32 = {
0x99d3d800, 0xc083d376, 0x0, 0x0}, v2_int64 = {0xc083d37699d3d800, 0x0}, uint128 =
0x0000000000000000c083d37699d3d800}
xmm5 {v4_float = {0x148, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0xbe, 0x63, 0xa4,
0x43, 0x0 <repeats 12 times>},
v8_int16 = {0x63be, 0x43a4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x43a463be, 0x0, 0x0, 0x0}, v2_int64
= {0x43a463be, 0x0},
uint128 = 0x00000000000000000000000043a463be}
xmm6 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm7 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm8 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x49, 0x85, 0x46, 0xbc,
0x0 <repeats 12 times>},
v8_int16 = {0x8549, 0xbc46, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0xbc468549, 0x0, 0x0, 0x0}, v2_int64
= {0xbc468549, 0x0},
uint128 = 0x000000000000000000000000bc468549}
xmm9 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm10 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0xcc, 0x21, 0x59, 0x3f,
0x0 <repeats 12 times>},
v8_int16 = {0x21cc, 0x3f59, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x3f5921cc, 0x0, 0x0, 0x0}, v2_int64
= {0x3f5921cc, 0x0},
uint128 = 0x0000000000000000000000003f5921cc}
xmm11 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm12 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x4a, 0x85, 0x46, 0x3c,
0x0 <repeats 12 times>},
v8_int16 = {0x854a, 0x3c46, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x3c46854a, 0x0, 0x0, 0x0}, v2_int64
= {0x3c46854a, 0x0},
uint128 = 0x0000000000000000000000003c46854a}
xmm13 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm14 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x4a, 0x85, 0x46, 0x3c,
0x0 <repeats 12 times>},
v8_int16 = {0x854a, 0x3c46, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x3c46854a, 0x0, 0x0, 0x0}, v2_int64
= {0x3c46854a, 0x0},
uint128 = 0x0000000000000000000000003c46854a}
xmm15 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>},
v8_int16 = {0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
mxcsr 0x1fa4 [ ZE PE IM DM ZM OM UM PM ]
(gdb) disassemble
Dump of assembler code for function _clutter_input_device_translate_axis:
0x000000385767aa70 <+0>: mov 0xc8(%rdi),%rdi
0x000000385767aa77 <+7>: xor %eax,%eax
0x000000385767aa79 <+9>: test %rdi,%rdi
0x000000385767aa7c <+12>: je 0x385767aaf0 <_clutter_input_device_translate_axis+128>
0x000000385767aa7e <+14>: cmp %esi,0x8(%rdi)
0x000000385767aa81 <+17>: jbe 0x385767aae8 <_clutter_input_device_translate_axis+120>
0x000000385767aa83 <+19>: mov %esi,%esi
0x000000385767aa85 <+21>: lea (%rsi,%rsi,2),%rcx
0x000000385767aa89 <+25>: shl $0x4,%rcx
0x000000385767aa8d <+29>: add (%rdi),%rcx
0x000000385767aa90 <+32>: mov (%rcx),%esi
0x000000385767aa92 <+34>: sub $0x1,%esi
0x000000385767aa95 <+37>: cmp $0x1,%esi
0x000000385767aa98 <+40>: jbe 0x385767aae8 <_clutter_input_device_translate_axis+120>
0x000000385767aa9a <+42>: movsd 0x20(%rcx),%xmm3
0x000000385767aa9f <+47>: test %rdx,%rdx
0x000000385767aaa2 <+50>: movsd 0x18(%rcx),%xmm2
0x000000385767aaa7 <+55>: movapd %xmm0,%xmm1
0x000000385767aaab <+59>: movapd %xmm3,%xmm4
0x000000385767aaaf <+63>: subsd %xmm2,%xmm3
0x000000385767aab3 <+67>: subsd %xmm2,%xmm1
0x000000385767aab7 <+71>: subsd %xmm0,%xmm4
0x000000385767aabb <+75>: movsd 0x8(%rcx),%xmm0
0x000000385767aac0 <+80>: mulsd 0x10(%rcx),%xmm1
0x000000385767aac5 <+85>: mulsd %xmm4,%xmm0
0x000000385767aac9 <+89>: addsd %xmm0,%xmm1
0x000000385767aacd <+93>: divsd %xmm3,%xmm1
0x000000385767aad1 <+97>: je 0x385767aae0 <_clutter_input_device_translate_axis+112>
=> 0x000000385767aad3 <+99>: movsd %xmm1,(%rdx)
0x000000385767aad7 <+103>: mov $0x1,%al
0x000000385767aad9 <+105>: retq
0x000000385767aada <+106>: nopw 0x0(%rax,%rax,1)
0x000000385767aae0 <+112>: mov $0x1,%eax
0x000000385767aae5 <+117>: nopl (%rax)
0x000000385767aae8 <+120>: repz retq
0x000000385767aaea <+122>: nopw 0x0(%rax,%rax,1)
0x000000385767aaf0 <+128>: repz retq
[deepfire betelheise ~]$ rpm -qi clutter
Name : clutter
Version : 1.14.4
Release : 4.fc19
Architecture: x86_64
Install Date: Sun 14 Jul 2013 12:53:38 AM MSK
Group : Development/Libraries
Size : 4376632
License : LGPLv2+
Signature : RSA/SHA256, Wed 26 Jun 2013 07:44:50 PM MSK, Key ID 07477e65fb4b18e6
Source RPM : clutter-1.14.4-4.fc19.src.rpm
Build Date : Wed 26 Jun 2013 12:40:05 PM MSK
Build Host : buildvm-12.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
...
--
regards,
Samium Gromoff
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