Unsupported Syscall futex_waitv
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Description
[FATAL src/record_syscall.cc:7013:rec_process_syscall_arch()]
(task 3392718 (rec:3392718) at time 135)
-> Assertion `t->regs().syscall_result_signed() == -syscall_state.expect_errno' failed to hold. Expected ENOSYS for 'futex_waitv' but got result -22 (errno EINVAL); execution of syscall unsupported by rr
Can we expect support for this syscall anytime soonish or is it not possible? Also could i run my program with an older kernel perhaps?
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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.
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Research direction
Start in src/record_syscall.cc around rec_process_syscall_arch() at line 7013 and trace how unsupported syscalls and expected errno values are handled. Reproduce the futex_waitv failure from the issue, then determine the project’s existing syscall-support path; done means the reported execution no longer aborts as unsupported, with the relevant behavior verified.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, linux
- Domain
- devtools, operating-systems
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100