During July 2025, Zheng Yu focused on improving the stability of the geerlingguy/linux repository by addressing a memory leak in the JFS kernel subsystem. He identified and resolved an issue in dbAllocCtl where metapage reference counts were not properly decremented, which could lead to memory leaks during premature exits. By introducing explicit calls to release_metapage() when certain conditions were met, Zheng ensured more reliable memory management under high-load scenarios. His work involved in-depth kernel development and bug fixing using C, and included targeted testing and code review to validate the solution, enhancing both runtime reliability and code maintainability.