> > That is curious. This ticket mentions Shmem though, and in our case it does > not look suspicious at all. E.g. on a box that has the problem at the moment: > Shmem: 41856 kB. The box has 256GB of RAM. > > But I'd (given my lack of knowledge) expect the issues to be related anyway. what about mapped? mapped is pretty high 1GB on my machine, I'm still reproduce that in C...however the user process is killed but not the io_wq_worker kernel processes, that's also the reason why the server socket still listening(even if the user process is killed), the bug only occurs(in netty) with a high number of operations and using eventfd_write to unblock io_uring_enter(IORING_ENTER_GETEVENTS) (tested on kernel 5.9 and 5.10) -- Josef
