Mixture of Insights.

Technical notes

Technical notes by Wang Tong on post-training, agents, inference, and systems debugging.

Recent writing

18 articles

  1. PayPal startup crash: filesystem device numbers and App Zygote errno

    Tracing a PayPal startup failure to Magisk's filesystem device-number allocation and an App Zygote SELinux error, then testing the two changes and their limits.

    Android system debugging

  2. Android READ_LOGS: auditing permission and SELinux context

    Android system debugging

  3. Android app-context audits: UID, SELinux and mount namespaces

    Android system debugging

  4. Rooted Android detection: userspace signals and attestation limits

    Android system debugging

  5. ORBIT: a control plane for experiments on rented GPUs

    ORBIT: remote GPU runs

  6. SFT cold-start before GRPO for constrained planning

    Post-Training in Practice
All writing