Issue #22188 has been reported by rwstauner (Randy Stauner). ---------------------------------------- Bug #22188: Debug symbols missing when compiled with GCC LTO https://bugs.ruby-lang.org/issues/22188 * Author: rwstauner (Randy Stauner) * Status: Open * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- When compiling with LTO (the XCFLAGS and XLDFLAGS below) RUBY_CRASH_REPORT does not resolve symbols. ( export optflags="-O3" cflags="-fno-omit-frame-pointer" export XCFLAGS="-flto=auto -ffat-lto-objects -Werror=lto-type-mismatch" export XLDFLAGS="-flto=auto -ffat-lto-objects" ./configure --disable-install-doc --disable-shared make -j miniruby ) Simple crash simulation: ./miniruby -e 'Process.kill("SEGV", $$)' On master the output includes: -- C level backtrace information ------------------------------------------- /src/miniruby(0x5608c71bafdd) [0x5608c71bafdd] /src/miniruby(0x5608c71c6f46) [0x5608c71c6f46] /src/miniruby(0x5608c6f31370) [0x5608c6f31370] /src/miniruby(0x5608c70e3150) [0x5608c70e3150] /usr/lib/libc.so.6(0x7f62122ac2d0) [0x7f62122ac2d0] /usr/lib/libc.so.6(kill+0xb) [0x7f62122ac4db] /src/miniruby(0x5608c70e1a65) [0x5608c70e1a65] /src/miniruby(0x5608c7189d1e) [0x5608c7189d1e] /src/miniruby(0x5608c718dea7) [0x5608c718dea7] /src/miniruby(0x5608c719417e) [0x5608c719417e] /src/miniruby(0x5608c71b793c) [0x5608c71b793c] /src/miniruby(0x5608c6f3d13c) [0x5608c6f3d13c] /src/miniruby(0x5608c6f42321) [0x5608c6f42321] /src/miniruby(0x5608c6e4f9b3) [0x5608c6e4f9b3] /usr/lib/libc.so.6(0x7f62122956c1) [0x7f62122956c1] /usr/lib/libc.so.6(__libc_start_main+0x89) [0x7f62122957f9] [0x5608c6e4f9f5] With a tiny change to fall back to symtab (even after parsing DWARF) we can get (empty lines added for comparison with next block): -- C level backtrace information ------------------------------------------- /src/miniruby(rb_print_backtrace+0x1d) [0x55f6397aafdd] /src/vm_dump.c:1111 /src/miniruby(rb_vm_bugreport+0xa26) [0x55f6397b6f46] /src/vm_dump.c:1473 /src/miniruby(rb_bug_for_fatal_signal+0x110) [0x55f639521370] /src/error.c:1140 /src/miniruby(sigsegv+0x50) [0x55f6396d3150] /src/signal.c:948 /usr/lib/libc.so.6(0x7f991555d2d0) [0x7f991555d2d0] /usr/lib/libc.so.6(kill+0xb) [0x7f991555d4db] /src/miniruby(rb_f_kill+0x205) [0x55f6396d1a65] /src/signal.c:487 /src/miniruby(vm_call_cfunc_with_frame_+0xfe) [0x55f639779d1e] /src/vm_insnhelper.c:3821 /src/miniruby(vm_sendish.constprop.0+0xb7) [0x55f63977dea7] /src/vm_insnhelper.c:6056 /src/miniruby(vm_exec_core.lto_priv.0+0x6e) [0x55f63978417e] /src/insns.def:909 /src/miniruby(rb_vm_exec+0xec) [0x55f6397a793c] /src/vm.c:2825 /src/miniruby(rb_ec_exec_node+0xac) [0x55f63952d13c] /src/eval.c:284 /src/miniruby(ruby_run_node+0x61) [0x55f639532321] /src/eval.c:322 /src/miniruby(main+0x63) [0x55f63943f9b3] ./main.c:42 PR: https://github.com/ruby/ruby/pull/17743 Currently the code in addr2line.c has a stub: case DW_FORM_ref_addr: goto finish; /* not supported yet */ If we add support for that we can get better names and inlined frames (empty lines added for comparison with previous block): -- C level backtrace information ------------------------------------------- /src/miniruby(rb_print_backtrace+0x1d) [0x55cd045f81dd] /src/vm_dump.c:1111 /src/miniruby(fprintf+0x0) [0x55cd04604146] /src/vm_dump.c:1473 /src/miniruby(rb_vm_bugreport) /src/vm_dump.c:1476 /src/miniruby(rb_bug_for_fatal_signal+0x110) [0x55cd0436e370] /src/error.c:1140 /src/miniruby(sigsegv+0x50) [0x55cd04520150] /src/signal.c:948 /usr/lib/libc.so.6(0x7f9ef85522d0) [0x7f9ef85522d0] /usr/lib/libc.so.6(kill+0xb) [0x7f9ef85524db] /src/miniruby(rb_f_kill+0x205) [0x55cd0451ea65] /src/signal.c:487 /src/miniruby(vm_call_cfunc_with_frame_+0xfe) [0x55cd045c6f1e] /src/vm_insnhelper.c:3821 /src/miniruby(vm_sendish+0xb7) [0x55cd045cb0a7] /src/vm_insnhelper.c:6056 /src/miniruby(vm_exec_core+0x6e) [0x55cd045d137e] /src/insns.def:909 /src/miniruby(vm_exec_loop+0x16) [0x55cd045f4b3c] /src/vm.c:2825 /src/miniruby(rb_vm_exec) /src/vm.c:2801 /src/miniruby(rb_ec_exec_node+0xac) [0x55cd0437a13c] /src/eval.c:284 /src/miniruby(ruby_run_node+0x61) [0x55cd0437f321] /src/eval.c:322 /src/miniruby(rb_main+0x22) [0x55cd0428c9b3] ./main.c:42 /src/miniruby(main) ./main.c:62 /usr/lib/libc.so.6(0x7f9ef853b6c1) [0x7f9ef853b6c1] /usr/lib/libc.so.6(__libc_start_main+0x89) [0x7f9ef853b7f9] /src/miniruby(_start+0x25) [0x55cd0428c9f5] ./main.c:63 PR: https://github.com/ruby/ruby/pull/17744 -- https://bugs.ruby-lang.org/