Chew segmentation fault while building on Ubuntu/Debian

[Mike Frysinger]

On 08 Jan 2022 04:38, Tiberiu Chibici via Binutils wrote:
> I have some more information about this issue, another person running
> Ubuntu 20.04.3 LTS was able to reproduce the same issue (using WSL). Also,
> I tried to debug the issue in GDB, and this seems to be the origin of the
> segmentation fault. Is there anything else I can help with to get closer to
> the source of the problem?
> 
> (gdb) run -f ../../../binutils-2.37/bfd/doc/doc.str <
> ../../../binutils-2.37/bfd/doc/../archures.c

the chew program is extremely simple.  you can enable more debugging info:
$ cd bfd/doc
$ make clean
$ make CC_FOR_BUILD='gcc -O0 -ggdb3 -fsanitize=address'
$ ./chew -f ../../../binutils-2.37/bfd/doc/doc.str < ../../../binutils-2.37/bfd/doc/../archures.c

see if that triggers a failure with more logging.

> Starting program:
> /home/tibi/Nanobyte/nanobyte_os_with_interrupts/toolchain/binutils-build-2.37/bfd/doc/chew
> -f ../../../binutils-2.37/bfd/doc/doc.str <
> ../../../binutils-2.37/bfd/doc/../archures.c
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> 
> Program received signal SIGSEGV, Segmentation fault.
> __strcmp_avx2 () at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:105
> 105     ../sysdeps/x86_64/multiarch/strcmp-avx2.S: No such file or
> directory.
> (gdb) bt
> #0  __strcmp_avx2 () at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:105
> #1  0x00005555555575a1 in lookup_word (word=0x55555555f890
> "skip_past_newline") at ../../../binutils-2.37/bfd/doc/chew.c:1242

you can set a break on lookup_word and see what the *root tree looks like.
-mike
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