Eric Dumazet <[email protected]> wrote: > Hi Al > > I tried to debug strange crashes in tcp_poll() called from > sys_epoll_wait() -> sock_poll() > > The symptom is that sock->sk is NULL and we therefore dereference a NULL > pointer. > > It's really rare crashes but still, it would be nice to understand where > is the bug. Presumably latest kernels would crash in sock_poll() because > of the sk_can_busy_loop(sock->sk) call. > > We do test sock->sk being NULL in sock_fasync(), but epoll should be > safe because of existing synchronization (epmutex) ?
It should be safe because of ep->mtx, actually, as epmutex is not taken in sys_epoll_wait. I took a look at this but have not found anything. I've yet to see this this on my machines. When did you start noticing this? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
