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Hi, In our site xrootd went down many times. (*) is the log from /var/log/message. (**) is the log copied from pcuwdata11 which said "protocol data length error". (*) Nov 11 18:45:43 pcuwdata12 kernel: xrootd[25791]: segfault at 00002aaa7fffffff rip 00002aaa7fffffff rsp 000000004bb2bef0 error 14 Nov 10 10:10:12 pcuwdata12 kernel: xrootd[5882]: segfault at 00000000000000c8 rip 0000000000439e98 rsp 0000000045aa3fc0 error 4 Nov 13 12:20:07 pcuwdata11 kernel: xrootd[18153]: segfault at 0000000000000000 rip 00002aaaaaadd0d6 rsp 000000004334fe90 error 4 Nov 10 14:03:25 pcuwdata9 kernel: xrootd[29919]: segfault at 0000000000000198 rip 0000003e9c008950 rsp 000000004093de78 error 4 (**) 091113 12:20:07 21773 XrdPoll: Poller 0 enabled yzhu.17679:22@pcuwdata11 091113 12:20:07 21773 yzhu.17679:22@pcuwdata11 XrootdProtocol: 0200 req=3019 dlen=4194304 091113 12:20:07 21773 yzhu.17679:22@pcuwdata11 XrootdProtocol: 0200 fh=0 write 4194304@650117120 091113 12:20:07 21773 XrdSched: running yzhu.17679:22@pcuwdata11 inq=0 091113 12:20:07 21773 yzhu.17679:22@pcuwdata11 XrootdProtocol: bd73 req=57139 dlen=-260842445 091113 12:20:07 21773 yzhu.17679:22@pcuwdata11 XrootdResponse: bd73 sending err 3000: Invalid request data length 091113 12:20:07 21773 XrootdXeq: yzhu.17679:22@pcuwdata11 disc 0:24:52 (protocol data length error) 091113 12:20:07 21773 yzhu.17679:22@pcuwdata11 XrootdFile: closing w /xrootd/users/yzhu/RAWcosmicsL1Calo/daq.ATLAS.0092160.physics.L1Calo.LB0051.SFO-2._0002.data 091113 12:20:07 21773 yzhu.17679:22@pcuwdata11 ofs_close: use=1 fn=/xrootd/users/yzhu/RAWcosmicsL1Calo/daq.ATLAS.0092160.physics.L1Calo.LB0051.SFO-2._0002.data 091113 16:51:05 001 Scalla is starting. . . Copr. 2007 Stanford University, xrd version 20090904-0700_dbg ++++++ xrootd [log in to unmask] initialization started. Config using configuration file /opt/xrootd-20090904/conf/xrdcluster.cfg =====> xrd.port 1094 Config maximum number of connections restricted to 1024 091113 16:51:05 001 XrdConfig: sendfile enabled. 091113 16:51:05 20250 XrdXeq: Buffer Manager reshaper thread started 091113 16:51:05 001 XrdSched: scheduling underused thread monitor in 780 seconds 091113 16:51:05 001 XrdSched: Starting with 2 workers 091113 16:51:05 001 XrdLink: Allocating 8 link objects at a time 091113 16:51:05 001 XrdPoll: Starting poller 0 Wen