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sysprog21

17 indexed repositories · View on GitHub

lkmpg
The Linux Kernel Module Programming Guide (updated for 5.0+ kernels)

TeX · 8593 stars
shecc
A self-hosting and educational C optimizing compiler

C · 1393 stars
rv32emu
Compact and Efficient RISC-V RV32I[MAFC] emulator

C · 588 stars
simplefs
A simple native file system for Linux kernel

C · 495 stars
semu
A minimalist RISC-V system emulator capable of running Linux kernel with efficient event-driven scheduling

C · 311 stars
elfuse
Run Arm64/x86-64 Linux ELF binaries on macOS Apple Silicon

C · 268 stars
vwifi
A virtual wireless device driver for Linux

C · 248 stars
kvm-host
A minimalist type 2 hypervisor using Linux Kernel Virtual Machine (KVM)

C · 204 stars
concurrency-primer
Concurrency Primer

TeX · 131 stars
libx11-compat
An in-process implementation of Xlib layered on top of SDL2/SDL3

C · 127 stars
vcam
Virtual camera device driver for Linux

C · 124 stars
mado
A window system for resource-constrained devices

C · 118 stars
kbox
Boot a real Linux kernel as an in-process library (LKL) and route intercepted syscalls to it via seccomp

C · 95 stars
codetrial
A live technical interview simulator

Rust · 54 stars
frama-c-mcp
MCP server that gives AI agents Frama-C: EVA, WP, and sandboxed ACSL iteration

Rust · 31 stars
Kconfiglib
A flexible Python Kconfig implementation

Python · 22 stars
kxo
A Tic-Tac-Toe Game Engine implemented as Linux kernel module

C · 12 stars

Beginner friendly Everything

Open All

Absolute sysroot symlinks fail on case-sensitive APFS Open

sysprog21/elfuse#390 · 1 assignee · Opened Sep 20, 2026
[Build/Windows] Linker errors (LNK2038 / LNK2005 / LNK1120) when building with MSVC toolchain Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sysprog21/codetrial#70 · Opened Sep 20, 2026
Jim repeat the question for 2 times in the Robot Strides Plans solution and didnt end the conversation automatically Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

sysprog21/codetrial#67 · 1 comment · Opened Sep 20, 2026
Jim returns to Test stage after completing complexity and edge-case analysis Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

sysprog21/codetrial#66 · 4 comments · Opened Sep 20, 2026
Add a whiteboard interview mode Open

sysprog21/codetrial#65 · 2 comments · 1 assignee · Opened Sep 19, 2026
Agent stops responding mid-interview for 2+ minutes; next session also starts without any opening greeting Open

sysprog21/codetrial#64 · 4 comments · 1 assignee · Opened Sep 19, 2026
UI not updating and timer keeps running after agent ends interview Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

sysprog21/codetrial#62 · Opened Sep 18, 2026
`mremap` in-place growth overwrites an adjacent coalesced anonymous mapping Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

sysprog21/elfuse#389 · Opened Sep 18, 2026
Improve syntax-aware auto indentation Open

Difficulty 4/5 3-5 days Newbie friendliness 64/100

sysprog21/codetrial#61 · Opened Sep 18, 2026
Test case input is not displayed when tests fail Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

sysprog21/codetrial#60 · 1 comment · Opened Sep 18, 2026
Recurring weaknesses appear as separate single-attempt entries Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

sysprog21/codetrial#57 · Opened Sep 17, 2026
CodeTrial crashes when starting an interview on macOS 26 arm64 Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

sysprog21/codetrial#56 · 1 comment · Opened Sep 17, 2026
Agent repeatedly loops on unfulfilled STAR follow-up Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

sysprog21/codetrial#51 · Opened Sep 16, 2026
Play test tone is silent; interviewer voice is always audible Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

sysprog21/codetrial#44 · 5 comments · Opened Sep 15, 2026
A signal delivered in a syscall epilogue records the TLBI wire values as the guest's `X8` through `X11` Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

sysprog21/elfuse#384 · 1 comment · Opened Sep 15, 2026
run_e_acsl reports compile_error on non-x86 hosts Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

sysprog21/frama-c-mcp#27 · Opened Sep 14, 2026
`rt_sigreturn` overwrites the restored X8, so a signal taken on an `svc` re-enters it as syscall 2 Open

Difficulty 4/5 3-5 days Newbie friendliness 64/100

sysprog21/elfuse#379 · Opened Sep 13, 2026
A guest signal does not interrupt futex, epoll_wait or a finite select Open

sysprog21/elfuse#378 · 2 comments · 1 assignee · Opened Sep 13, 2026
Consolidate the futex syscall contract surface Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

sysprog21/elfuse#356 · Opened Sep 2, 2026
Empty path without AT_EMPTY_PATH reports ENOTDIR, not ENOENT, under a sysroot Open

bug

sysprog21/elfuse#354 · 1 assignee · Opened Sep 1, 2026
Build self-hosted GCC with elfuse Open

sysprog21/elfuse#338 · 2 comments · 1 assignee · Opened Aug 26, 2026
Compile Linux kernel with elfuse Open

sysprog21/elfuse#337 · 2 comments · 1 assignee · Opened Aug 26, 2026
Guest heap corruption in a program exec'd by a large parent (dpkg maintainer script) Open

bug

sysprog21/elfuse#320 · 1 assignee · Opened Aug 22, 2026
Implement general USB translation layer (Linux usbdevfs over IOKit) Open

sysprog21/elfuse#319 · 6 comments · 1 assignee · Opened Aug 21, 2026
Validating the trust boundary of the self-hosted macOS CI runner Open

sysprog21/elfuse#250 · 1 comment · 1 assignee · Opened Jul 28, 2026
Rosetta will only retain a subset of features in macOS 28 Open

sysprog21/elfuse#246 · 1 assignee · Opened Jul 27, 2026
Implement v0.3 SBI PMU (Performance Monitoring Unit) extension Open

enhancement

sysprog21/rv32emu#756 · 1 assignee · Opened Jul 26, 2026
Integrate scoped gVisor syscall conformance Open

sysprog21/elfuse#225 · 2 comments · 1 assignee · Opened Jul 18, 2026
elfuse real-workload syscall frequency ranking (Top 50) Open

documentation

sysprog21/elfuse#224 · 1 comment · 1 assignee · Opened Jul 18, 2026
macOS offscreen smoke: xmms no-exit-after-close + xwpe/xmms in-process snapshot timeout (rc=-4) Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sysprog21/libx11-compat#63 · Opened Jul 17, 2026
Host fd usage no fixed reserve can bound Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

sysprog21/elfuse#208 · Opened Jul 15, 2026
CI/CD performance benchmarking Open

sysprog21/elfuse#195 · 1 assignee · Opened Jul 11, 2026
Add native AppImage support Open

enhancement

sysprog21/elfuse#192 · 1 comment · 1 assignee · Opened Jul 10, 2026
Integrate scoped Linux Test Project syscall conformance Open

sysprog21/elfuse#171 · 5 comments · 1 assignee · Opened Jul 8, 2026
sys_mmap: eager zero-fill on MAP_ANONYMOUS makes sparse mappings ~5x slower than Linux Open

sysprog21/elfuse#165 · 1 assignee · Opened Jul 7, 2026
Alt/Option accelerators do not reach clients on macOS Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

sysprog21/libx11-compat#41 · 2 comments · Opened Jul 6, 2026
V4L2 buffer sequence number is not updated during streaming Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

sysprog21/vcam#54 · Opened Jun 18, 2026
VIDIOC_S_FMT should return EBUSY after buffers are allocated Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

sysprog21/vcam#52 · Opened Jun 12, 2026
Actual capture frame interval differs from VIDIOC_G_PARM Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

sysprog21/vcam#49 · Opened Jun 9, 2026
RVV JIT support Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

sysprog21/rv32emu#736 · Opened May 17, 2026
RVV trap-path tests, arch-test V coverage, and decode layout guard Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

sysprog21/rv32emu#735 · Opened May 17, 2026
Implement remaining RVV 1.0 instruction families Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

sysprog21/rv32emu#734 · 3 comments · Opened May 17, 2026
Add ACT4 user-mode architectural test coverage for RV32IMAF(C) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sysprog21/rv32emu#730 · Opened May 15, 2026
OCI image support for Linux userspace execution on macOS Open

sysprog21/elfuse#31 · 2 comments · 2 assignees · Opened May 13, 2026
fixed_sqrt() returns incorrect value when the input is less than 1 Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

sysprog21/kxo#30 · 1 comment · 1 reaction · Opened May 4, 2026
Headless backend fails on macOS: ftruncate returns EINVAL on POSIX shared memory Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

sysprog21/mado#160 · Opened Apr 25, 2026
Ubuntu Container on macOS (Apple Container) as an Alternative Development Environment Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

sysprog21/semu#129 · 1 reaction · Opened Apr 24, 2026
forward_sendfile bypasses shadow_sp for writable shadow destination FDs Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

sysprog21/kbox#64 · Opened Apr 24, 2026
bind mount resolves source path inside guest instead of host Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

sysprog21/kbox#56 · 2 comments · Opened Apr 11, 2026
Allowing trampoline IPs cause arbitrary host syscall execution in trap mode Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sysprog21/kbox#55 · Opened Apr 9, 2026

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