On Mon, Feb 09 2026 at 14:07, Joe Damato wrote: > On Sat, Feb 07, 2026 at 11:50:23AM +0100, Thomas Gleixner wrote: >> Using get_cpu() in the tracepoint assignment causes an obvious preempt >> count leak because nothing invokes put_cpu() to undo it: >> >> softirq: huh, entered softirq 3 NET_RX with preempt_count 00000100, exited >> with 00000101? >> >> This clearly has seen a lot of testing in the last 3+ years... > > I'm the author who introduced the bug. FWIW, I did use it quite a bit when I > had i40e devices.
Right, but always with PREEMPT_NONE and no debug option which would enforce PREEMPT_COUNT ...
