bug#42946: grep: invalid read in pop_fail_stack

[Paul Eggert]

On 8/20/20 2:02 AM, Luca Borzacchiello via Bug reports for GNU grep wrote:

> running grep 3.4 with the attached inputs, cause an invalid read in
> pop_fail_stack.

Thanks for reporting that. This appears to be a duplicate of these longstanding 
grep bug reports:

https://bugs.gnu.org/22793
https://bugs.gnu.org/32806
https://bugs.gnu.org/34238

so I have merged your bug report to join the throng.

The actual bug is in glibc, and is reported here:

https://sourceware.org/bugzilla/show_bug.cgi?id=11053

This bug been unfixed since 2009 so a fix is not likely soon, unfortunately. A 
patch would be welcome of course.