Re: Assertion `idx >= 0 && idx < num_fields ()' failed.

[mail@simon-woerner.de]

> Can you give some steps to reproduce,

Sure, tested on an Arch Linux but this should work on any recent Linux distribution:

```
# dependencies:
# wget zstd python3 gdb libpixman binutils

# get target binary
wget 'https://pixeldrain.com/u/EAUpLuPj?dl=1' -O prebuilt.tar.zst
tar -xvf prebuilt.tar.zst

# or build from source (requires rust and some dependencies)
git clone https://github.com/fuzzware-fuzzer/hoedur.git
cd hoedur
cargo build --bin hoedur-arm
cd target/debug

# get target input/config file
wget 'https://pixeldrain.com/u/FqoekVRY?dl=1' -O reproducer.corpus.tar.zst
echo 'root: {}' > log.yml 

# get gef (not sure which gdb command used by gef triggers the crash)
wget https://github.com/hugsy/gef/raw/2023.08/gef.py

# run reproducer
LD_LIBRARY_PATH=. gdb --nx --args ./hoedur-arm --log-config ./log.yml --import-config ./reproducer.corpus.tar.zst run-corpus ./reproducer.corpus.tar.zst

gdb) start
gdb) b cpu<TAB> # for an unrelated autocomplete crash
gdb) b cpu_handle_exception
gdb) source gef.py
gdb) r # crash after `cpu_handle_exception` breakpoint
```

Regards,
Simon Wörner


November 23, 2023 at 17:01, "Simon Marchi" <simark@simark.ca> wrote:

> 
> On 11/23/23 07:11, mail@simon-woerner.de wrote:
> 
> > 
> > > 
> > > Which gdb are you using? I wonder if the problem has already been
> > >  fixed.
> > > 
> > 
> >  
> >  I'm using the latest version:
> >  
> >  ```
> >  $ gdb --version
> >  GNU gdb (GDB) 13.2
> >  [...]
> >  ```
> > 
> 
> Can you give some steps to reproduce, so that someone has a chance to
> start debugging the problem? Otherwise, it's virtually impossible to
> know what happens.
> 
> Simon
>