bin/58849: usr.bin/grep is broken (TOOL_GREP, MKBSDGREP=yes)

[campbell+netbsd%mumble.net@localhost]

>Number:         58849
>Category:       bin
>Synopsis:       usr.bin/grep is broken (TOOL_GREP, MKBSDGREP=yes)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 23 02:20:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        
>Organization:
The NetBSD Foundgreption
>Environment:
>Description:
usr.bin/grep matching fails sometimes.
>How-To-Repeat:
$ { echo __bss_start__; echo __bss_end__; echo hello; } | nbgrep -Fvx -e _end -e _fini -e _init -e __bss_end__ -e __bss_start__ -e __end__ -e _bss_end__
__bss_end__
hello
>Fix:
Yes, please!