Comment 20 for bug 1974214

I didn't keep that exact same core, but I have a new one that seems equivalent.

#0 0x0000559e51e99993 in arc_sign (signspec=<optimized out>, sigheaders=0x559e529bb580, errstr=errstr@entry=0x7ffcc0624e20) at ./b-exim4-daemon-custom/build-Linux-x86_64/arc.c:1663
        rp = 0x672e6c69616d3d48
        identity = 0x559e529bb8a8 "****.com"
        selector = 0x559e529bb8c8 "arc-20220506"
        privkey = 0x559e525ad2f8 "-----BEGIN PRIVATE KEY-----\n"...
        opts = 0x559e529bb92a ""
        s = <optimized out>
        options = <optimized out>
        sep = 58
        headers = <optimized out>
        rheaders = 0x559e529bb950
        ar = {data = <optimized out>, len = <optimized out>}
        instance = <optimized out>
        g = 0x0
        b = <optimized out>
        __FUNCTION__ = "arc_sign"
        ret_sigheaders = <optimized out>

(gdb) p *rp
Cannot access memory at address 0x672e6c69616d3d48
(gdb) p headers_rlist
$1 = (hdr_rlist *) 0x559e52b48d78

Does this help?
Please talk to me as you would to a little child, as you find necessary :-)