Hi,
Am 29.11.2012 16:17, schrieb Dieter Bloms:
> Hello,
>
> I've compiled vdr on alpinelinux 2.5.0 and get a segfault during
> start of vdr.
> Even without plugins I get this segfault (I didn't apply any patch to
> vdr sources).
> Vdr was started with the command:
>
> /usr/local/bin/vdr --config=/etc/vdr --epgfile=/tmp/epg.data --grab=/dev/shm
> --log=3.1 --mute --no-kbd --user=root --video=/remote/vdr/
>
> I've made a backtrace with gdb:
>
> --snip--
> vdrservernew:/tmp# gdb --core core /usr/local/bin/vdr
> GNU gdb (GDB) 7.5
> Copyright (C) 2012 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-unknown-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /usr/local/bin/vdr...done.
> [New LWP 26493]
> [New LWP 26492]
> [New LWP 26494]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/libthread_db.so.1".
> Core was generated by `/usr/local/bin/vdr --config=/etc/vdr
> --epgfile=/tmp/epg.data --grab=/dev/shm --'.
> Program terminated with signal 11, Segmentation fault.
> #0 skipspace (s=0x40800000 <Address 0x40800000 out of bounds>) at tools.h:196
> 196 if ((uchar)*s > ' ') // most strings don't have any leading space,
> so handle this case as fast as possible
> (gdb) bt
> #0 skipspace (s=0x40800000 <Address 0x40800000 out of bounds>) at tools.h:196
> #1 isempty (s=0x40800000 <Address 0x40800000 out of bounds>) at tools.c:249
> #2 0x00000000004a1eb9 in FromString (s=0x2e531d2 "1 01 deu 4:3",
> this=0x2e4aba0) at epg.c:36
Looks like the pointer returned by sscanf is not valid:
32: bool tComponent::FromString(const char *s)
33: {
34: unsigned int Stream, Type;
35: int n = sscanf(s, "%X %02X %7s %a[^\n]", &Stream, &Type, language,
&description); // 7 = MAXLANGCODE2 - 1
36: if (n != 4 || isempty(description)) {
37: free(description);
38: description = NULL;
39: }
40: stream = Stream;
41: type = Type;
42: return n >= 3;
43: }
What I would do:
- set description to NULL before the sscanf
- log all values returned by sscanf and compare it with the given string
Maybe a problem/different behaviour in the uClibc?
Lars.
> #3 cComponents::SetComponent (this=<optimized out>, Index=0,
> s=s@entry=0x2e531d2 "1 01 deu 4:3") at epg.c:81
> #4 0x00000000004a40f3 in cEvent::Parse (this=0x2e43360, s=<optimized out>)
> at epg.c:495
> #5 0x00000000004e9ea6 in cRecordingInfo::Read (this=0x2e2d110,
> f=f@entry=0x2e2c330) at recording.c:468
> #6 0x00000000004eb4e3 in cRecording::cRecording (this=0x2e2c650,
> FileName=0x2e4c15c "Sex_and_the_City_2/2012-11-19.20.10.27-0.rec") at
> recording.c:723
> #7 0x00000000004eceb1 in cRecordings::ScanVideoDir (this=0x7fe7c0
> <Recordings>, DirName=0x2e412b0 "/remote/vdr/Sex_and_the_City_2",
> Foreground=false, LinkLevel=0) at recording.c:1165
> #8 0x00000000004ed32c in cRecordings::ScanVideoDir (this=0x7fe7c0
> <Recordings>, DirName=0x2e25ff0 "/remote/vdr", Foreground=false, LinkLevel=0)
> at recording.c:1180
> #9 0x000000000052694e in cThread::StartThread (Thread=0x7fe7e0
> <Recordings+32>) at thread.c:262
> #10 0x00006e6b7ce69406 in start_thread () from /lib/libpthread.so.0.9.32
> #11 0x00006e6b7ce61885 in clone () from /lib/libpthread.so.0.9.32
> #12 0x0000000000000000 in ?? ()
> --snip--
>
> does anybody see what is wrong here ?
>
>
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