Oracle Linux 8 Upgrade

[calh]

This is the best I could do on upgrading the build system to OL8. Upgrading Ruby past the 3.x line gives a segfault:

#0  0x00007f668f7cc015 in rb_protect (proc=0x7f668fcfa27d <ruby::require_protect(unsigned long)>, data=140077606931360, pstate=0x7f666b33c3dc) at eval.c:1110
#1  0x00007f668fcfa448 in ruby::require (filename=0x7f665c008ba0 "/var/www/html/access_test.rb") at /usr/src/mod_ruby/src/ruby.cpp:549
#2  0x00007f668fced37d in ruby_request_load_handler (r=0x7f665c002c10, module=0x56373db30818 "/var/www/html/access_test.rb", cls=0x56373db30870 "AccessTest::Handler", method=0x56373db308c0 "check_access") at /usr/src/mod_ruby/src/module.cpp:426
#3  0x00007f668fceddfb in ruby_request_get_access_handler (r=0x7f665c002c10) at /usr/src/mod_ruby/src/module.cpp:602
#4  0x00007f668fceeb07 in ruby_request_access_handler (r=0x7f665c002c10) at /usr/src/mod_ruby/src/module.cpp:877
#5  0x00007f668fceb40a in ruby_access_handler (r=0x7f665c002c10) at /usr/src/mod_ruby/src/mod_ruby.c:70
#6  0x000056373d1af408 in ap_run_access_checker_ex ()
#7  0x000056373d1b19a9 in ap_process_request_internal ()
#8  0x000056373d1d0b90 in ap_process_async_request ()
#9  0x000056373d1ccf60 in ap_process_http_connection ()
#10 0x000056373d1c3348 in ap_run_process_connection ()
#11 0x00007f6692f1aa47 in process_socket () from /etc/httpd/modules/mod_mpm_event.so
#12 0x00007f6692f1b3ea in worker_thread () from /etc/httpd/modules/mod_mpm_event.so
#13 0x00007f669e20e1da in start_thread () from /lib64/libpthread.so.0
#14 0x00007f669dc648d3 in clone () from /lib64/libc.so.6

More details:

Thread 56 "httpd" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f666b33d700 (LWP 67)]
0x00007f668f7cc015 in rb_protect (proc=0x7f668fcfa27d <ruby::require_protect(unsigned long)>, data=140077606931360, pstate=0x7f666b33c3dc) at eval.c:1110
1110        rb_control_frame_t *volatile cfp = ec->cfp;
#0  0x00007f668f7cc015 in rb_protect (proc=0x7f668fcfa27d <ruby::require_protect(unsigned long)>, data=140077606931360, pstate=0x7f666b33c3dc) at eval.c:1110
        result = 8
        state = RUBY_TAG_NONE
        ec = 0x0
        cfp = 0x0
        protect_tag = {prev = 0x0}
        org_jmpbuf = {0x0, 0x0, 0x0, 0x0, 0x0}
#1  0x00007f668fcfa448 in ruby::require (filename=0x7f665c008ba0 "/var/www/html/access_test.rb") at /usr/src/mod_ruby/src/ruby.cpp:549
        error = 0
#2  0x00007f668fced37d in ruby_request_load_handler (r=0x7f665c002c10, module=0x56373db30818 "/var/www/html/access_test.rb", cls=0x56373db30870 "AccessTest::Handler", method=0x56373db308c0 "check_access") at /usr/src/mod_ruby/src/module.cpp:426
        handler = {_vptr.Handler = 0x7f668ff15c00 <vtable for modruby::Handler+16>, _module = "/var/www/html/access_test.rb", _klass = "AccessTest::Handler", _method = "check_access", _id = "", object = 0x0}
        i = {first = <error reading variable: Cannot create a lazy string with address 0x0, and a non-zero length.>, second = 0x56373db30818}
#3  0x00007f668fceddfb in ruby_request_get_access_handler (r=0x7f665c002c10) at /usr/src/mod_ruby/src/module.cpp:602
        h_config = 0x56373db30710
        req = {_req = 0x7f665c002c10, _server = 0x0, _form_data = 0x0, _queries = 0x0, _error = "", _content = std::vector of length 0, capacity 0, has_read_content = false, _has_setup_client_read = false, _module_config = 0x0, static max_content_length = 20971520}
        notes = {handle = 0x7f665c003d50}
        cfg = 0x56373db1aaa0
        module = 0x56373db30818 "/var/www/html/access_test.rb"
        cls = 0x56373db30870 "AccessTest::Handler"
        method = 0x56373db308c0 "check_access"
#4  0x00007f668fceeb07 in ruby_request_access_handler (r=0x7f665c002c10) at /usr/src/mod_ruby/src/module.cpp:877
        handler = {_vptr.Handler = 0x7f668ff15c00 <vtable for modruby::Handler+16>, _module = "/var/www/html/access_test.rb", _klass = "AccessTest::Handler", _method = "check_access", _id = "", object = 0x0}
        result = 0
        req = {_req = 0x7f665c002c10, _server = 0x0, _form_data = 0x0, _queries = 0x0, _error = "", _content = std::vector of length 0, capacity 0, has_read_content = false, _has_setup_client_read = false, _module_config = 0x0, static max_content_length = 20971520}
        rc = 200

But downgrading down to 2.7.5 seems to work okay:

$ ./script/docker_run
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f61824157b4 in read () from /lib64/libpthread.so.0

$ curl localhost:8080
ModRuby FATAL ERROR: Ruby Exception: Error creating Ruby class 'AccessTest::Handler'
Module  : /var/www/html/access_test.rb
Class   : AccessTest::Handler
Method  : check_access
Type    : SystemStackError
SystemStackErrorMessage : stack level too deep

$ curl localhost:8080
Ruby check_access()
Hi there from ruby

@mikeowens, do you have any experience with the Ruby C API changes from the 2.x line to 3.x?