On Tue, Mar 11, 2025 at 11:15:11AM +0100, Jakub Kicinski wrote: > On Mon, 10 Mar 2025 14:35:24 +0000 Matthew Wilcox (Oracle) wrote: > > Long-term, networking needs to stop taking a refcount on the pages that > > it uses and rely on the caller to hold whatever references are necessary > > to make the memory stable. > > TBH I'm not clear on who is going to fix this. > IIRC we already told NVMe people that sending slab memory over sendpage > is not well supported. Plus the bug is in BPF integration, judging by > the stack traces (skmsg is a BPF thing). Joy. slab over sendpage doesn't work because you refuse to take the patches to make it work by transparently falling back to sendmsg. It's a giant pain for all network storage drivers caused by the networking maintainers. The ultimate root cause is the fact that networking messes with the refcounts.
