Crash with mismatched CTF archive

This happens sometimes after rebuilding the kernel and the CTF archive doesn't match the running kernel.

(gdb) bt
#0  0x00007ffff7eaf157 in dt_btf_add_to_ctf (dtp=dtp@entry=0x555555561350, btf=btf@entry=0x55555cd11b40, ctf=ctf@entry=0x55555cd4d6c0, type_id=25) at libdtrace/dt_btf.c:386
#1  0x00007ffff7eaf079 in dt_btf_add_to_ctf (dtp=dtp@entry=0x555555561350, btf=btf@entry=0x55555cd11b40, ctf=ctf@entry=0x55555cd4d6c0, type_id=<optimized out>, type_id@entry=148898)
    at libdtrace/dt_btf.c:597
#2  0x00007ffff7eafb1a in dt_btf_to_ctf (dtp=0x555555561350, dmp=<optimized out>, btf=0x55555cd11b40) at libdtrace/dt_btf.c:750
#3  0x00007ffff7eafc51 in dt_btf_module_ctf (dtp=dtp@entry=0x555555561350, dmp=dmp@entry=0x555556bf14d0) at libdtrace/dt_btf.c:806
#4  0x00007ffff7eebda2 in dt_kern_module_ctf_from_btf (dtp=0x555555561350, dmp=0x555556bf14d0) at libdtrace/dt_module.c:848
#5  dt_kern_module_find_ctf (dtp=0x555555561350, dmp=0x555556bf14d0) at libdtrace/dt_module.c:1023
#6  dt_module_load (dtp=dtp@entry=0x555555561350, dmp=dmp@entry=0x555556bf14d0) at libdtrace/dt_module.c:403
#7  0x00007ffff7eed946 in dtrace_lookup_by_name (dtp=dtp@entry=0x555555561350, object=object@entry=0xfffffffffffffffe <error: Cannot access memory at address 0xfffffffffffffffe>,
    name=name@entry=0x555556d86590 "event_show", symp=<optimized out>, symp@entry=0x0, sip=sip@entry=0x7fffffffdee0) at libdtrace/dt_module.c:1658
#8  0x00007ffff7f1215c in populate (dtp=0x555555561350) at libdtrace/dt_prov_fbt.c:126
#9  0x00007ffff7eee66b in dtrace_init (dtp=0x555555561350) at libdtrace/dt_open.c:1218
#10 0x0000555555555f8a in main (argc=2, argv=0x7fffffffe388) at cmd/dtrace.c:1343
(gdb) frame 0
#0  0x00007ffff7eaf157 in dt_btf_add_to_ctf (dtp=dtp@entry=0x555555561350, btf=btf@entry=0x55555cd11b40, ctf=ctf@entry=0x55555cd4d6c0, type_id=25) at libdtrace/dt_btf.c:386
386                             return dtp->dt_shared_btf->ctfids[type_id];
(gdb) p type_id
$1 = 25
(gdb) p dtp->dt_shared_btf
$2 = (struct dt_btf *) 0x5555569ef0f0
(gdb) p *dtp->dt_shared_btf
$3 = {data = 0x7ffff4e00010, size = 6610139, hdr = 0x7ffff4e00010, sdata = 0x7ffff51a62a0 "", ssize = 0, type_cnt = 148895, types = 0x555557093140, ctfids = 0x0}
(gdb)

Reproduce the crash after rebuilding the kernel, then start at libdtrace/dt_btf.c:386 and trace the callers through dt_btf_to_ctf and dt_btf_module_ctf. The work is done when a mismatched CTF archive no longer causes the crash shown in the report.