[Aboriginal] Merry christmas, I have found two bugs

[Bjørn Forsman]

On 26 December 2012 23:23, Bjørn Forsman <bjorn.forsman at gmail.com> wrote:
[...]
> Now when I get toybox rebuilt with debug symbols I can figure out
> (from the core file) where the bug is.

I built toybox in a ./dev-environment.sh and caused a coredump with
"./toybox_unstripped ls". Then I exited and mounted hda.sqf to
mnt_rootfs/ and hdb.img to mnt_home/. This my backtrace:

bfo at knopfler ~/aboriginal/build/system-image-armv5l $ sudo $(which
arm-none-linux-gnueabi-gdb) mnt_home/toybox-0.4.2/toybox_unstripped
mnt_home/toybox-0.4.2/core
GNU gdb (Sourcery CodeBench Lite 2012.03-57) 7.2.50.20100908-cvs
Copyright (C) 2010 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 "--host=i686-pc-linux-gnu
--target=arm-none-linux-gnueabi".
For bug reporting instructions, please see:
<https://support.codesourcery.com/GNUToolchain/>...
Reading symbols from
/home/bfo/aboriginal/build/system-image-armv5l/mnt_home/toybox-0.4.2/toybox_unstripped...done.

warning: core file may not match specified executable file.
[New LWP 1886]

warning: Could not load shared library symbols for 6 libraries, e.g.
/lib/libutil.so.0.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?

warning: Unable to find dynamic linker.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
Core was generated by `./toybox_unstripped ls'.
Program terminated with signal 8, Arithmetic exception.
#0  0xb6edbd34 in ?? ()
(gdb) set sysroot mnt_rootfs/
Reading symbols from mnt_rootfs/lib/libutil.so.0...(no debugging
symbols found)...done.
Loaded symbols for mnt_rootfs/lib/libutil.so.0
Reading symbols from mnt_rootfs/lib/libcrypt.so.0...(no debugging
symbols found)...done.
Loaded symbols for mnt_rootfs/lib/libcrypt.so.0
Reading symbols from mnt_rootfs/lib/libm.so.0...(no debugging symbols
found)...done.
Loaded symbols for mnt_rootfs/lib/libm.so.0
Reading symbols from mnt_rootfs/lib/libgcc_s.so.1...(no debugging
symbols found)...done.
Loaded symbols for mnt_rootfs/lib/libgcc_s.so.1
Reading symbols from mnt_rootfs/lib/libc.so.0...(no debugging symbols
found)...done.
Loaded symbols for mnt_rootfs/lib/libc.so.0
Reading symbols from mnt_rootfs/lib/ld-uClibc.so.0...(no debugging
symbols found)...done.
Loaded symbols for mnt_rootfs/lib/ld-uClibc.so.0
(gdb) bt
#0  0xb6edbd34 in raise () from mnt_rootfs/lib/libc.so.0
#1  0x00028d84 in __div0 () at
/home/bfo/aboriginal/build/temp-armv5l/gcc-core/gcc/config/arm/lib1funcs.asm:1000
#2  0x000280c8 in __udivsi3 () at
/home/bfo/aboriginal/build/temp-armv5l/gcc-core/gcc/config/arm/lib1funcs.asm:754
#3  0x0001a1d0 in next_column (ul=0, dtlen=16, columns=0,
xpos=0xbee639d0) at toys/posix/ls.c:186
#4  0x0001a8b8 in listfiles (dirfd=3, indir=0x6b5580) at toys/posix/ls.c:308
#5  0x0001a420 in listfiles (dirfd=-100, indir=0x6b54f8) at toys/posix/ls.c:228
#6  0x0001b3a0 in ls_main () at toys/posix/ls.c:455
#7  0x0000b224 in toy_exec (argv=0xbee63e48) at main.c:104
#8  0x0000b2b0 in toybox_main () at main.c:119
#9  0x0000b224 in toy_exec (argv=0xbee63e44) at main.c:104
#10 0x0000b2b0 in toybox_main () at main.c:119
#11 0x0000b4a4 in main (argc=2, argv=0xbee63e44) at main.c:161
(gdb)

Let me know if you see something in there. I'll probably take a deeper
look at this tomorrow.

Best regards,
Bjørn Forsman