Bug#657885: ffmpeg: Illegal instruction on dreamplug (arm cpu)
Darwin Te
darwin_te at hotmail.com
Mon Feb 6 04:10:48 UTC 2012
Installed ffmpeg-dbg and libav-dbg:
[user at debian 13] ~ > gdb ffmpeg
GNU gdb (GDB) 7.3-debian
Copyright (C) 2011 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 "arm-linux-gnueabi".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/ffmpeg...Reading symbols from /usr/lib/debug/.build-id/2d/1df8571d341bd8b7ea3d712c24490e74d6ed0d.debug...done.
done.
(gdb) run
Starting program: /usr/bin/ffmpeg
[Thread debugging using libthread_db enabled]
Program received signal SIGILL, Illegal instruction.
0x00018cf8 in show_banner () at /build/buildd-libav_0.8-1-armel-M_oTHt/libav-0.8/cmdutils.c:510
510 /build/buildd-libav_0.8-1-armel-M_oTHt/libav-0.8/cmdutils.c: No such file or directory.
in /build/buildd-libav_0.8-1-armel-M_oTHt/libav-0.8/cmdutils.c
(gdb) bt
#0 0x00018cf8 in show_banner () at /build/buildd-libav_0.8-1-armel-M_oTHt/libav-0.8/cmdutils.c:510
#1 0x0000f910 in main (argc=1, argv=0xbefffc74) at /build/buildd-libav_0.8-1-armel-M_oTHt/libav-0.8/ffmpeg.c:4377
(gdb) info program
Using the running image of child Thread 0x41decfd0 (LWP 20534).
Program stopped at 0x18cf8.
It stopped with signal SIGILL, Illegal instruction.
(gdb)
It stopped with signal SIGILL, Illegal instruction.
(gdb) ^Z
[1]+ Stopped gdb ffmpeg
[04:10 - 0.21]
[user at debian 14] ~ > cat /proc/20534/maps
00008000-00021000 r-xp 00000000 08:02 130087 /usr/bin/ffmpeg
00028000-0002a000 rwxp 00018000 08:02 130087 /usr/bin/ffmpeg
0002a000-0004b000 rwxp 00000000 00:00 0 [heap]
40000000-4001d000 r-xp 00000000 08:02 212838 /lib/arm-linux-gnueabi/ld-2.13.so
4001d000-40024000 rwxp 00000000 00:00 0
40024000-40025000 r-xp 0001c000 08:02 212838 /lib/arm-linux-gnueabi/ld-2.13.so
40025000-40026000 rwxp 0001d000 08:02 212838 /lib/arm-linux-gnueabi/ld-2.13.so
4002e000-4003b000 r-xp 00000000 08:02 130076 /usr/lib/arm-linux-gnueabi/libavdevice.so.53.2.0
4003b000-40042000 ---p 0000d000 08:02 130076 /usr/lib/arm-linux-gnueabi/libavdevice.so.53.2.0
40042000-40044000 rwxp 0000c000 08:02 130076 /usr/lib/arm-linux-gnueabi/libavdevice.so.53.2.0
40044000-40065000 r-xp 00000000 08:02 130080 /usr/lib/arm-linux-gnueabi/libavfilter.so.2.15.0
40065000-4006c000 ---p 00021000 08:02 130080 /usr/lib/arm-linux-gnueabi/libavfilter.so.2.15.0
4006c000-40071000 rwxp 00020000 08:02 130080 /usr/lib/arm-linux-gnueabi/libavfilter.so.2.15.0
40071000-40141000 r-xp 00000000 08:02 132526 /usr/lib/arm-linux-gnueabi/libavformat.so.53.20.0
40141000-40148000 ---p 000d0000 08:02 132526 /usr/lib/arm-linux-gnueabi/libavformat.so.53.20.0
40148000-40153000 rwxp 000cf000 08:02 132526 /usr/lib/arm-linux-gnueabi/libavformat.so.53.20.0
40153000-407e3000 r-xp 00000000 08:02 132523 /usr/lib/arm-linux-gnueabi/libavcodec.so.53.34.0
407e3000-407fb000 rwxp 00690000 08:02 132523 /usr/lib/arm-linux-gnueabi/libavcodec.so.53.34.0
407fb000-40d66000 rwxp 00000000 00:00 0
40d66000-40d75000 r-xp 00000000 08:02 132579 /usr/lib/arm-linux-gnueabi/libpostproc.so.52.0.0
40d75000-40d7c000 ---p 0000f000 08:02 132579 /usr/lib/arm-linux-gnueabi/libpostproc.so.52.0.0
40d7c000-40d7d000 rwxp 0000e000 08:02 132579 /usr/lib/arm-linux-gnueabi/libpostproc.so.52.0.0
40d7d000-40dac000 r-xp 00000000 08:02 132604 /usr/lib/arm-linux-gnueabi/libswscale.so.2.1.0
40dac000-40db3000 ---p 0002f000 08:02 132604 /usr/lib/arm-linux-gnueabi/libswscale.so.2.1.0
..............
.............
..............
Best regards,
Darwin
> Date: Sun, 5 Feb 2012 09:02:50 +0100
> Subject: Re: Bug#657885: ffmpeg: Illegal instruction on dreamplug (arm cpu)
> From: siretart at gmail.com
> To: darwin_te at hotmail.com; 657885 at bugs.debian.org
>
> On Sun, Jan 29, 2012 at 5:27 PM, Darwin Te <darwin_te at hotmail.com> wrote:
> > Package: ffmpeg
> > Version: 4:0.8-1
> > Severity: normal
> >
> >
> > Dear Maintainer,
> >
> >
> > [16:16 - 1.25]
> > [user at debian 1] ~ > ffmpeg
> > Illegal instruction
> > [16:16 - 1.25]
> > [user at debian 2] ~ > gdb ffmpeg
> > GNU gdb (GDB) 7.3-debian
> > Copyright (C) 2011 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 "arm-linux-gnueabi".
> > For bug reporting instructions, please see:
> > <http://www.gnu.org/software/gdb/bugs/>...
> > Reading symbols from /usr/bin/ffmpeg...(no debugging symbols found)...done.
> > (gdb) run
> > Starting program: /usr/bin/ffmpeg
> > [Thread debugging using libthread_db enabled]
> >
> > Program received signal SIGILL, Illegal instruction.
> > 0x00018cf8 in ?? ()
> > (gdb) disassemble $pc, $pc+0x20
> > Cannot access memory at address 0x0
> > Dump of assembler code from 0x18cf8 to 0x18d18:
> > => 0x00018cf8: movw lr, #2011 ; 0x7db
> > 0x00018cfc: ldr r2, [pc, #148] ; 0x18d98
> > 0x00018d00: ldr r4, [pc, #148] ; 0x18d9c
> > 0x00018d04: ldr r12, [r12]
> > 0x00018d08: ldr r3, [r3, r2]
> > 0x00018d0c: add r4, pc, r4
> > 0x00018d10: ldr r2, [pc, #136] ; 0x18da0
> > 0x00018d14: str lr, [sp, #4]
> > End of assembler dump.
> >
> >
> > More system information:
> >
> > Initializing cgroup subsys cpu
> > Linux version 3.1.10 (kelly at bbb.internal) (gcc version 4.4.1 (Sourcery G++ Lite 2010q1-202) ) #1 PREEMPT Fri Jan 20 10:47:05 MST 2012
> > CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053977
> > CPU: VIVT data cache, VIVT instruction cache
> > Machine: Marvell GuruPlug Reference Board
>
> I see. Your machine is not ARMv7 capable, yet, the baseline flavor of
> libavcodec does seem to use ARMv7 instructions. cf.
> http://blogs.arm.com/software-enablement/251-how-to-load-constants-in-assembly-for-arm-architecture/
>
> Can you please retrieve a backtrace with libav-dbg installed? I need
> to know where exactly in the code the offending instruction occurs in
> order to determine if it's an upstream bug or a configuration issue.
>
> Thanks
> Reinhard
>
> --
> regards,
> Reinhard
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