Linux Kernel IRQ Entry Handling Vulnerability on s390 Architecture

A vulnerability in the Linux kernel's handling of interrupt request (IRQ) entries on the s390 architecture has been addressed. The issue arose because the .irqentry.text section was empty, preventing proper filtering and de-duplication of stack traces in the stack depot. This lack of filtering could lead to stack depot warnings about reaching limit capacity, especially with certain kernel features enabled. The vulnerability was resolved by moving asynchronous IO/EXT interrupt handlers into the .irqentry.text section, allowing for proper stack trace management while preserving important context for synchronous interrupts.

Impact

The vulnerability could cause stack depot warnings about reaching limit capacity, indicating potential issues with stack trace management that could affect system performance or stability.