Linux Kernel Daily: Critical Stability Fixes and EFI Fault Handling
Today's kernel activity includes 23 commits addressing critical stability issues, including fixes for EFI fault handling that could cause system freezes, cgroup deadlock resolution, and scheduler extension improvements.
Duration: PT2M
Episode overview
This episode is a short developer briefing from Linux Kernel Daily.
It explains recent repository work in plain language.
- Show: Linux Kernel Daily
- Published: 2026-05-04T00:00:00Z
- Audio duration: PT2M
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning, this is Linux Kernel Daily for May 4th, 2026.
No merged pull requests today, but 23 additional commits landed with several critical fixes.
The most significant fix comes from Ivan Hu addressing a critical EFI fault handling issue. Since recent FPU softirq changes, systems with buggy firmware could experience hard freezes instead of graceful recovery from EFI runtime faults. The fix replaces in_interrupt() with !in_task() to properly handle page faults…
Tejun Heo delivered a major cgroup stability fix, resolving a deadlock scenario where rmdir operations could hang indefinitely. The issue occurred when the rmdir caller was also a zombie reaper, creating an unbreakable wait cycle. The solution makes CSS killing asynchronous, allowing rmdir to return once…
Additional scheduler extension work from Tejun addresses task iteration issues in cgroup-scoped mode, preventing operations on torn-down task state that could trigger warnings or crashes.
Other notable fixes include Rajat Gupta's framebuffer security fix preventing use-after-free vulnerabilities in USB display drivers, and Xianglai Li's LoongArch KVM optimization that eliminates unnecessary memory relocations by…