Intel Shaodw Stack support was submitted for Linux 6.4 at the start of the merge window but now with this two-week merge window drawing to a close, it hasn’t been pulled yet and Linus Torvalds raised technical issues with the proposed patches that now jeopardize its arrival this cycle…

Source: Phoronix – Intel Shadow Stack For Linux Hits Last-Minute Snag With Issue Raised By Torvalds