Hi andrew, I only found it happened in slc5 machines with version xrootd-20090623(x86_64_linux_26,g++ (GCC) 3.4.6 20060404 (Red Hat 3.4.6-9) binary version) . Sometimes I even cannot kill "XrdCnsd" with "Kill" command. I need to use "Kill -9 " to kill it. Last night I downloaded xrootd-20090904 src version and compiled it locally. Until now I haven't found this problem again. Maybe the problem is related to gcc. Thanks Wen On Sat, Oct 10, 2009 at 3:17 AM, Andrew Hanushevsky <[log in to unmask]> wrote: > Hi Wen, > > OK. Does this only happen in SLC5 or does it happen in all kernels. > > Andy > > On Fri, 9 Oct 2009, wen guan wrote: > >> Hi Andrew, >> >> For newly started XrdCnsd, when doing a xrdcp, the >> disappeared "poll" thread will appear again and an shadow will be >> created in cns server. But for old Xrdcnsd, when doing xrdcp, no >> "poll" thread will be started. no shadow will be created in cns >> server. >> >> Wen >> >> On Fri, Oct 9, 2009 at 12:58 AM, Andrew Hanushevsky <[log in to unmask]> >> wrote: >>> >>> Hi Wen, >>> >>> I guess I don't understand the actual problem. When you say 'not respond" >>> what do you actually see to come to that conclusion. As for the analysis, >>> and stack traces, these are all perfectly normal. The "poll" thread need >>> not >>> exist at all times and, in fact, will disappear after a long period of >>> inactivity. I will look some more but I need to know what "no response" >>> appears like. >>> >>> Andy >>> >>> ----- Original Message ----- From: "wen guan" <[log in to unmask]> >>> To: <[log in to unmask]> >>> Sent: Tuesday, October 06, 2009 12:46 PM >>> Subject: XrdCnsd problem in slc5 with version xrootd-20090623 >>> >>> >>>> Hi, >>>> >>>> The XrdCnsd in xrootd-20090623 failed to create cns frequestly. >>>> When starting XrdCnsd, it works fine. But when trying it next day, it >>>> will not response. Below is the test result. >>>> >>>> It seems the "poll" thread cannot be started for old XrdCnsd(started >>>> more than one day and there is no active in long time(maybe 780s)). >>>> For (*), Process 10816 was an old XrdCnsd(started more than one day) >>>> process which didn't response. After killed it, a new process 13665 >>>> was created which worked fine. From here we can see process 13665 had >>>> a thread "poll"(thread 2) but process 10816 didn't have it. >>>> For (**), When there was no files copied to xrootd for 10 minutes, >>>> the "poll" thread in Process 13665 disappeared. But when I did a >>>> xrdcp to this server. We will saw this "poll" thread again. But for >>>> process which has on active for long time, the "poll" thread cannot be >>>> restart again. >>>> >>>> (*) >>>> [root@pcuwdata12 ~]# ps -ef|grep xrootd-2 >>>> xrootd 10798 1 0 Oct02 ? 00:21:21 >>>> /opt/xrootd-20090623/bin//xrootd -b -d -R xrootd -l >>>> /tmp/log/xrootd/xrd.log -c /opt/xrootd-20090623/conf/xrdcluster.cfg >>>> xrootd 10809 1 0 Oct02 ? 00:00:05 >>>> /opt/xrootd-20090623/bin//cmsd -b -d -R xrootd -l >>>> /tmp/log/xrootd/cms.log -c /opt/xrootd-20090623/conf/xrdcluster.cfg >>>> xrootd 10816 10798 0 Oct02 ? 00:00:00 >>>> /opt/xrootd-20090623/bin/XrdCnsd -d -l /tmp/log/xrootd/cnsd.log >>>> root://pcuwsun04.cern.ch:1095 >>>> root 13452 13340 0 20:59 pts/1 00:00:00 grep xrootd-2 >>>> [root@pcuwdata12 ~]# pstack 10816 >>>> Thread 7 (Thread 0x410cf940 (LWP 10826)): >>>> #0 0x000000370e40ae00 in pthread_cond_timedwait@@GLIBC_2.3.2 () >>>> #1 0x0000000000479707 in XrdSysCondVar::Wait () >>>> #2 0x000000000047b8e9 in XrdScheduler::TimeSched () >>>> #3 0x000000000047a21d in XrdStartTSched () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 6 (Thread 0x416ed940 (LWP 10827)): >>>> #0 0x000000370e40c9b1 in sem_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000000041ffb7 in XrdSysSemaphore::Wait () >>>> #2 0x000000000047ae11 in XrdScheduler::Run () >>>> #3 0x000000000047a241 in XrdStartWorking () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 5 (Thread 0x417ee940 (LWP 10828)): >>>> #0 0x000000370e40c9b1 in sem_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000000041ffb7 in XrdSysSemaphore::Wait () >>>> #2 0x000000000047ae11 in XrdScheduler::Run () >>>> #3 0x000000000047a241 in XrdStartWorking () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 4 (Thread 0x418ef940 (LWP 10834)): >>>> #0 0x000000370e40d5cb in read () from /lib64/libpthread.so.0 >>>> #1 0x00000000004736b9 in XrdOucStream::GetLine () >>>> #2 0x000000000041eb06 in XrdCnsDaemon::getEvents () >>>> #3 0x000000000041dcfc in CnsEvents () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 3 (Thread 0x419f0940 (LWP 10835)): >>>> #0 0x000000370e40d174 in __lll_lock_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000370e408aca in _L_lock_1034 () from /lib64/libpthread.so.0 >>>> #2 0x000000370e40898c in pthread_mutex_lock () from >>>> /lib64/libpthread.so.0 >>>> #3 0x000000000041ff5b in XrdSysMutex::Lock () >>>> #4 0x000000000041f6d4 in XrdCnsEvent::Queue () >>>> #5 0x000000000041ee43 in XrdCnsDaemon::getEvents () >>>> #6 0x000000000041dcfc in CnsEvents () >>>> #7 0x0000000000479637 in XrdSysThread_Xeq () >>>> #8 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #9 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 2 (Thread 0x41af1940 (LWP 11659)): >>>> #0 0x000000370d89a0b1 in nanosleep () from /lib64/libc.so.6 >>>> #1 0x000000370d899ed4 in sleep () from /lib64/libc.so.6 >>>> #2 0x000000000044117a in GarbageCollectorThread () >>>> #3 0x000000000045413a in XrdClientThreadDispatcher () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 1 (Thread 0x2b53e8698db0 (LWP 10816)): >>>> #0 0x000000370e40c9b1 in sem_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000000041ffb7 in XrdSysSemaphore::Wait () >>>> #2 0x000000000041f8bd in XrdCnsEvent::Remove () >>>> #3 0x000000000041ea05 in XrdCnsDaemon::doRequests () >>>> #4 0x00000000004202d1 in main () >>>> [root@pcuwdata12 ~]# kill 10816 >>>> [root@pcuwdata12 ~]# kill 10816 >>>> -bash: kill: (10816) - No such process >>>> [root@pcuwdata12 ~]# ps -ef|grep xrootd-2 >>>> xrootd 10798 1 0 Oct02 ? 00:21:21 >>>> /opt/xrootd-20090623/bin//xrootd -b -d -R xrootd -l >>>> /tmp/log/xrootd/xrd.log -c /opt/xrootd-20090623/conf/xrdcluster.cfg >>>> xrootd 10809 1 0 Oct02 ? 00:00:05 >>>> /opt/xrootd-20090623/bin//cmsd -b -d -R xrootd -l >>>> /tmp/log/xrootd/cms.log -c /opt/xrootd-20090623/conf/xrdcluster.cfg >>>> xrootd 13665 10798 0 21:03 ? 00:00:00 >>>> /opt/xrootd-20090623/bin/XrdCnsd -d -l /tmp/log/xrootd/cnsd.log >>>> root://pcuwsun04.cern.ch:1095 >>>> root 13678 13340 0 21:03 pts/1 00:00:00 grep xrootd-2 >>>> [root@pcuwdata12 ~]# pstack 13665 >>>> Thread 8 (Thread 0x4074b940 (LWP 13666)): >>>> #0 0x000000370e40ae00 in pthread_cond_timedwait@@GLIBC_2.3.2 () >>>> #1 0x0000000000479707 in XrdSysCondVar::Wait () >>>> #2 0x000000000047b8e9 in XrdScheduler::TimeSched () >>>> #3 0x000000000047a21d in XrdStartTSched () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 7 (Thread 0x41b0f940 (LWP 13667)): >>>> #0 0x000000370e40c9b1 in sem_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000000041ffb7 in XrdSysSemaphore::Wait () >>>> #2 0x000000000047ae11 in XrdScheduler::Run () >>>> #3 0x000000000047a241 in XrdStartWorking () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 6 (Thread 0x41d8c940 (LWP 13668)): >>>> #0 0x000000370e40c9b1 in sem_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000000041ffb7 in XrdSysSemaphore::Wait () >>>> #2 0x000000000047ae11 in XrdScheduler::Run () >>>> #3 0x000000000047a241 in XrdStartWorking () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 5 (Thread 0x41e8d940 (LWP 13669)): >>>> #0 0x000000370e40d5cb in read () from /lib64/libpthread.so.0 >>>> #1 0x00000000004736b9 in XrdOucStream::GetLine () >>>> #2 0x000000000041eb06 in XrdCnsDaemon::getEvents () >>>> #3 0x000000000041dcfc in CnsEvents () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 4 (Thread 0x41f8e940 (LWP 13670)): >>>> #0 0x000000370e40d5cb in read () from /lib64/libpthread.so.0 >>>> #1 0x00000000004736b9 in XrdOucStream::GetLine () >>>> #2 0x000000000041eb06 in XrdCnsDaemon::getEvents () >>>> #3 0x000000000041dcfc in CnsEvents () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 3 (Thread 0x4208f940 (LWP 13671)): >>>> #0 0x000000370d89a0b1 in nanosleep () from /lib64/libc.so.6 >>>> #1 0x000000370d899ed4 in sleep () from /lib64/libc.so.6 >>>> #2 0x000000000044117a in GarbageCollectorThread () >>>> #3 0x000000000045413a in XrdClientThreadDispatcher () >>>> #4 0x0000000000479637 in XrdSysThread_Xeq () >>>> #5 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #6 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 2 (Thread 0x41279940 (LWP 13672)): >>>> #0 0x000000370d8cae46 in poll () from /lib64/libc.so.6 >>>> #1 0x000000000046b945 in XrdClientSock::RecvRaw () >>>> #2 0x000000000044e08c in XrdClientPhyConnection::ReadRaw () >>>> #3 0x000000000044ac3e in XrdClientMessage::ReadRaw () >>>> #4 0x000000000044e84c in XrdClientPhyConnection::BuildMessage () >>>> #5 0x000000000044b730 in SocketReaderThread () >>>> #6 0x000000000045413a in XrdClientThreadDispatcher () >>>> #7 0x0000000000479637 in XrdSysThread_Xeq () >>>> #8 0x000000370e4064a7 in start_thread () from /lib64/libpthread.so.0 >>>> #9 0x000000370d8d3c2d in clone () from /lib64/libc.so.6 >>>> Thread 1 (Thread 0x2b06bb478db0 (LWP 13665)): >>>> #0 0x000000370e40c9b1 in sem_wait () from /lib64/libpthread.so.0 >>>> #1 0x000000000041ffb7 in XrdSysSemaphore::Wait () >>>> #2 0x000000000041f8bd in XrdCnsEvent::Remove () >>>> #3 0x000000000041ea05 in XrdCnsDaemon::doRequests () >>>> #4 0x00000000004202d1 in main () >>>> [root@pcuwdata12 ~]# >>>> [root@pcuwdata12 ~]# >>>> >>>> >>>> (***) cnsd.log >>>> 091006 20:56:10 1828 XrdCnsSched: running underused thread monitor inq=0 >>>> 091006 20:56:10 1828 XrdCnsSched: 2 threads; 1 idle >>>> 091006 20:56:10 1828 XrdCnsSched: scheduling underused thread monitor >>>> in 780 seconds >>>> >>>> >>>> Thanks >>>> Wen >>>> >>> >>> >