Re: Internal error with gawk-5.3.0

[Sam James]

Sam James <sam@gentoo.org> writes:

> Machine Type: x86_64-pc-linux-gnu
>
> Gawk Version: 5.3.0
>
> Attestation 1:
>         I have read 
> https://www.gnu.org/software/gawk/manual/html_node/Bugs.html.
>         Yes
>
> Attestation 2:
>         I have not modified the sources before building gawk.
>         True / False
>         True
>
> Description:
>         We received a downstream report in Gentoo of an internal error with
>         gawk at https://bugs.gentoo.org/921503.
>
>         gawk crashes with an 'internal error'.
>
>         Backtrace:
>         Program received signal SIGSEGV, Segmentation fault.
>         0x000055555557b1eb in do_match (nargs=<optimized out>) at 
> /usr/src/debug/sys-apps/gawk-5.3.0/gawk-5.3.0/builtin.c:2796
>         2796                            rlength = wc_indices[rstart + 
> rlength] - wc_indices[rstart];
>         (gdb) bt
>         #0  0x000055555557b1eb in do_match (nargs=<optimized out>) at 
> /usr/src/debug/sys-apps/gawk-5.3.0/gawk-5.3.0/builtin.c:2796
>         #1  0x000055555559e4b5 in r_interpret (code=<optimized out>) at 
> /usr/src/debug/sys-apps/gawk-5.3.0/gawk-5.3.0/interpret.h:1089
>         #2  0x000055555555aa51 in main (argc=<optimized out>, argv=<optimized 
> out>) at /usr/src/debug/sys-apps/gawk-5.3.0/gawk-5.3.0/main.c:549
>         (gdb)

(gdb) p wc_indices
$4 = (size_t *) 0x0

>
> Repeat-By:
>         $ gawk -v b=1111-22-33 -v r="^([0-9]{4}(-[0-9]{2}(-[0-9]{2})?)?)?$" '
>         END { match(b,"^([^,]*)(,(.*))?$",m)
>               print m[1]
>
>               print match(m[1],r)
>               print match(m[3],r)
>             } ' /dev/null
>         1111-22-33
>         1
>         gawk: cmd. line:6: fatal error: internal error
>         Aborted (core dumped)