This is a clone of issue RHEL-1915 to use for version rhel-10.0
–
Original description:

What were you trying to do that didn't work?

Convert a file from ISO-8859-1 to UTF-8 

Please provide the package NVR for which bug is seen:

glibc-common-2.34-60.el9.x86_64

How reproducible:

in house and by customer

Steps to reproduce

Test environment:
Release:          Red Hat Enterprise Linux release 9.2 (Plow)
Kernel:           5.14.0-284.25.1.el9_2.x86_64
IP Address:       10.1.183.219
glibc-common:     glibc-common-2.34-60.el9.x86_64
locale:           en.US.ISO-8859-1

Below 32K:

[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 31000 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
31000
48258

32K and above:

[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32000 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32000
49800
[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32001 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32001
50012
[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32002 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32002
49938
[root@test ~]# tr -dc '[:alnum:] \n' </dev/urandom | head -c 32003 > test.txt ; stat -c '%s' test.txt ; iconv -f ISO-8859-1 -t UTF-8 test.txt -o test.txt ; stat -c '%s' test.txt
32003
Bus error (core dumped)
28672

Expected results

File is converted

Actual results

core dump