Rick Macklem 2ba476324b Both a crash reported on freebsd-current on Oct. 18 under the ... subject heading "mtx_lock() of destroyed mutex on NFS" and PR# 156168 appear to be caused by clnt_dg_destroy() closing down the socket prematurely. When to close down the socket is controlled by a reference count (cs_refs), but clnt_dg_create() checks for sb_upcall being non-NULL to decide if a new socket is needed. I believe the crashes were caused by the following race: clnt_dg_destroy() finds cs_refs == 0 and decides to delete socket clnt_dg_destroy() then loses race with clnt_dg_create() for acquisition of the SOCKBUF_LOCK() clnt_dg_create() finds sb_upcall != NULL and increments cs_refs to 1 clnt_dg_destroy() then acquires SOCKBUF_LOCK(), sets sb_upcall to NULL and destroys socket This patch fixes the above race by changing clnt_dg_destroy() so that it acquires SOCKBUF_LOCK() before testing cs_refs. Tested by: bz PR: 156168 Reviewed by: dfr MFC after: 2 weeks		2011-11-03 14:38:03 +00:00
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rpcsec_gss
auth_none.c
auth_unix.c
auth.h
authunix_prot.c
clnt_dg.c	Both a crash reported on freebsd-current on Oct. 18 under the	2011-11-03 14:38:03 +00:00
clnt_rc.c
clnt_stat.h
clnt_vc.c
clnt.h
getnetconfig.c
netconfig.h
nettype.h
pmap_prot.h
replay.c
replay.h
rpc_callmsg.c
rpc_com.h
rpc_generic.c
rpc_msg.h
rpc_prot.c
rpc.h
rpcb_clnt.c
rpcb_clnt.h
rpcb_prot.c
rpcb_prot.h
rpcm_subs.h
rpcsec_gss.h
svc_auth_unix.c
svc_auth.c
svc_auth.h
svc_dg.c
svc_generic.c
svc_vc.c
svc.c
svc.h
types.h
xdr.h