[lldb-dev] [Bug 34590] New: [FreeBSD] lldb is missing ObjectFile plugin to write cores

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=34590

            Bug ID: 34590
           Summary: [FreeBSD] lldb is missing ObjectFile plugin to write
                    cores
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: gergely.czuczy at harmless.hu
                CC: llvm-bugs at lists.llvm.org

Hello,

Apparently it seems that the ObjectFile plugins got left out during importing
llvm, and because of this, it's not possible to save the core of the process
currently being debugged:
On aarch64, r322723:
root at build-pine64:/usr/ports/editors/emacs-devel/work/emacs-f44184f# cd lisp
l' -batch --no-site-file --no-site-lisp --eval '(setq load-prefer-newer t)'  -f
batch-byte-compile emacs-lisp/macroexp.el
(lldb) target create "../src/bootstrap-emacs"
Current executable set to '../src/bootstrap-emacs' (aarch64).
(lldb) settings set -- target.run-args  "-batch" "--no-site-file"
"--no-site-lisp" "--eval" "(setq load-prefer-newer t)" "-f"
"batch-byte-compile" "emacs-lisp/macroexp.el"
(lldb) r
Process 1016 launching
Process 1016 launched: '../src/bootstrap-emacs' (aarch64)
Process 1016 stopped
* thread #1, name = 'bootstrap-emacs', stop reason = signal SIGSEGV: invalid
address (fault address: 0x41b17978)
    frame #0: 0x0000000000228460
bootstrap-emacs`xnrealloc(pa=0x0000000000000000, nitems=0,
item_size=1102150015) at alloc.c:939
   936  {
   937    eassert (0 <= nitems && 0 < item_size);
   938    ptrdiff_t nbytes;
-> 939    if (INT_MULTIPLY_WRAPV (nitems, item_size, &nbytes) || SIZE_MAX <
nbytes)
   940      memory_full (SIZE_MAX);
   941    return xrealloc (pa, nbytes);
   942  }
(lldb) process save-core /root/foo.core
error: Failed to save core file for process: no ObjectFile plugins were able to
save a core for this process
(lldb)


On amd64 11-STABLE r311927:
$ lldb
(lldb) process attach --pid 54625
Process 54625 stopped

Executable module set to "/usr/bin/systat".
Architecture set to: x86_64--freebsd11.0.
(lldb) process save-core foobar.core
error: Failed to save core file for process: no ObjectFile plugins were able to
save a core for this process


Sharing cores of currently being debugged processes can be very helpful, when
repoting issues with various software. For an example, currently I'm trying to
figure out while emacs-devel segfaults during build on aarch64, and the
autogenerated core is different, due to the process' internal sigsegv handler.

The FreeBSD-side of the report:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222248

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