#163 Segfault in VBI

[Anonymous]

I'm pretty sure this is due to processing a very dirty
signal. It happends randomly.

** (zapping:3141): WARNING **: GConf key
'/apps/zapping/plugins/deinterlace/method' is unset and
has no default. Schemas incomplete or not installed?

(no debugging symbols found)
(no debugging symbols found)
[New Thread 36715440 (LWP 3150)]
[Thread 36715440 (LWP 3150) exited]
[New Thread 36715440 (LWP 3151)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1783520 (LWP 3141)]
0x00936e6c in memcpy () from /lib/libc.so.6
(gdb) bt
#0 0x00936e6c in memcpy () from /lib/libc.so.6
#1 0x001c19a2 in vbi_caption_init () from
/usr/lib/libzvbi.so.0
#2 0x001c27e3 in vbi_decode_caption () from
/usr/lib/libzvbi.so.0
#3 0x001f0242 in vbi_decode () from /usr/lib/libzvbi.so.0
#4 0x080be9a3 in startup_zvbi ()
#5 0x0029c4fc in g_vasprintf () from
/usr/lib/libglib-2.0.so.0
#6 0x002764ce in g_main_context_dispatch () from
/usr/lib/libglib-2.0.so.0
#7 0x002794d6 in g_main_context_check () from
/usr/lib/libglib-2.0.so.0
#8 0x002797c3 in g_main_loop_run () from
/usr/lib/libglib-2.0.so.0
#9 0x00532a46 in gtk_main () from
/usr/lib/libgtk-x11-2.0.so.0
#10 0x0807ffb0 in main ()
(gdb)

[Michael H. Schimek]

Logged In: YES
user_id=46861

I'm sorry I cannot find the problem. The backtrace seems to
be incomplete, could you try again after compiling libzvbi
with CFLAGS -g -O0 ? Please also add which version of
Zapping and libzvbi you have.

[Nobody/Anonymous]

Logged In: NO

I turned VBI off to stop crashing during use. It's worse on
piss poor cable signals with a lot of noise.

XAWTV's ntsc-cc does the same thing.

[Nobody/Anonymous]

Logged In: NO

I am not sure if this is the same issue, but my zapping
crashese everytime I switch to the teletext mode - it
displays the "Loading ..." image, and after few seconds it
crashes without displaying any teletext page. Gdb output is
as follows:

(gdb) r
Starting program: /usr/bin/zapping
Reading symbols from shared object read from target
memory...done.
Loaded system supplied DSO at 0xffffe000
[Thread debugging using libthread_db enabled]
[New Thread -1228355904 (LWP 3853)]
Detaching after fork from child process 3856.
zapping_lirc: could not connect to socket
zapping_lirc: No such file or directory
[New Thread -1237341280 (LWP 3860)]
[Thread -1237341280 (LWP 3860) exited]
[New Thread -1237341280 (LWP 3861)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1228355904 (LWP 3853)]
vbi3_page_unref (pg=0x0) at teletext.c:4070
4070 teletext.c: No such file or directory.
in teletext.c
(gdb) where
#0 vbi3_page_unref (pg=0x0) at teletext.c:4070
#1 0xb68bf0ab in teletext_view_from_widget ()
from /usr/lib/zapping/plugins/libteletext.zapping.so
#2 0x080f6a8a in __vbi3_event_handler_list_send
(es=0x840c534, ev=0xbff31a08)
at event.c:111
#3 0x081027b6 in store_page (td=0x84038e4, cp=0x8404a60)
at teletext_decoder.c:2177
#4 0x08103bf8 in vbi3_teletext_decoder_feed (td=0x84038e4,
buffer=0x84240e8 "/\0258�/\025\025\025I/\203T� �O��
\2067��\002�� 2�����\00222��8�14",
timestamp=1159301296.1901979) at teletext_decoder.c:2356
#5 0x08105f4d in vbi3_decoder_feed (vbi=0x84038b0,
sliced=0x84240e0,
n_lines=25, timestamp=1159301296.1901979) at
vbi_decoder.c:501
#6 0x080ca1ef in decoder_giofunc (source=0x830bc80,
condition=G_IO_IN,
data=0x0) at zvbi.c:1380
#7 0xb74d3c2d in g_io_channel_unix_get_fd () from
/usr/lib/libglib-2.0.so.0
#8 0xb74ab15d in g_main_context_dispatch () from
/usr/lib/libglib-2.0.so.0
#9 0xb74ae3ef in g_main_context_check () from
/usr/lib/libglib-2.0.so.0
#10 0xb74ae799 in g_main_loop_run () from
/usr/lib/libglib-2.0.so.0
#11 0xb7a14634 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#12 0x080856f5 in main_0_10cvs6 (argc=1, argv=0xbff367f4) at
main.c:1084
#13 0x08085b52 in main (argc=137722120, argv=0x1) at main.c:1103

The packages are from freshrpms:

zapping-0.10-0.3.cvs6.fc5
zvbi-0.2.19-2.fc5
rte-0.5.6-3.fc5

I have also tried zvbi-0.2.22-2.fc5.i386.rpm from Fedora
Extras, the problem remains.

[Jan Yenya Kasprzak]

Logged In: YES
user_id=579086

Oops, sorry for the previous anonymous comment, it was mine.