Failed to monkeypatch vdso on 4.15.0-21-generic
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Description
Running rr with Ubuntu 4.15.0-21-generic
[FATAL /build/rr-ViolGa/rr-5.1.0/src/Monkeypatcher.cc:582:patch_after_exec_archrr::X86Arch()] Failed to monkeypatch vdso: your __kernel_vsyscall() wasn't recognized.
Syscall buffering is now effectively disabled. If you're OK with
running rr without syscallbuf, then run the recorder passing the
--no-syscall-buffer arg.
If you're not OK with that, file an issue.
Maybe related to #1627
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start in src/Monkeypatcher.cc at line 582, where patch_after_exec_arch reports that __kernel_vsyscall() was not recognized. Compare the behavior with related issue #1627 and investigate it on Ubuntu with kernel 4.15.0-21-generic. Done means rr can recognize and monkeypatch the VDSO without disabling syscall buffering.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, linux
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100