Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!brl-adm!adm!dpk@BRL.ARPA From: dpk@BRL.ARPA (Doug Kingston) Newsgroups: comp.unix.wizards Subject: Bug in SUN Kernel RPC Message-ID: <1601@brl-adm.ARPA> Date: Tue, 16-Dec-86 21:01:41 EST Article-I.D.: brl-adm.1601 Posted: Tue Dec 16 21:01:41 1986 Date-Received: Wed, 17-Dec-86 20:18:28 EST Sender: news@brl-adm.ARPA Lines: 45 Index: sys/rpc/clnt_kudp.c FIX (Gould version and others?) Description: The SUN kernel mode RPC can hang while doing remote RPC that should timeout. An example is NFS when you remote mount a filesystem "soft". Some RPC's to this filesystem will hang. Mount is one such RPC. This problem was found in our Gould kernels which contain code almost identical to the SUN code. I know some other vendors using this code also have the problem. Specifically, the problem is that the function clntkudp_callit does a sleep on &so->so_rcv.sb_cc. The timeout routine, ckuwakeup(), had an incorrect wakeup value which is corrected below. Repeat By: Edit /etc/fstab to remote mount a filesystem. Shutdown the remote system. Reboot the your system. Watch your system hang when it attemps to mount the NFS filesystems. Fix: Apply the following diff: *** /tmp/,RCSt1016522 Tue Dec 16 20:37:15 1986 --- clnt_kudp.c Mon Dec 8 22:34:48 1986 *************** *** 498,504 **** rpc_debug(4, "cku_timeout\n"); #endif p->cku_flags |= CKU_TIMEDOUT; ! sbwakeup(&p->cku_sock->so_rcv); } /* --- 498,504 ---- rpc_debug(4, "cku_timeout\n"); #endif p->cku_flags |= CKU_TIMEDOUT; ! sbwakeup(&p->cku_sock->so_rcv.sb_cc); } /*