On Mon, Jun 29, 2026 at 04:07:14PM +0100, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" <[email protected]> > > A class of debug/observability features needs to interrupt a CPU that has > its interrupts locally masked: the all-CPU backtrace behind sysrq-l / > RCU-stall / hung-task / hard-lockup dumps, and crash_smp_send_stop() > capturing a stuck CPU's state into the vmcore. On arm64 these need a > mechanism that reaches a CPU spinning with DAIF masked, which a normal IPI > cannot.
Gentle ping. Any feedback? I'm looking forward to finding an upstreamable solution to the problem. -- Kiryl Shutsemau / Kirill A. Shutemov
