Seen from "eos cp" but backtrace is "pure" xrootd-client (so reporting here).
Versions:
```
~$ rpm -q xrootd-client-libs eos-client
1:xrootd-client-libs-4.8.3-1.el6.x86_64
(none):eos-client-4.2.22-1.el6.x86_64
```
Backtrace:
```
Core was generated by `eos cp -d --recursive /afs/cern.ch/user/h/hcuser01/www/hceos2/ root://eosuser.c'.
Program terminated with signal 6, Aborted.(gdb) bt
#0 0x00007f7ed88cf495 in raise () from /lib64/libc.so.6
#1 0x00007f7ed88d0c75 in abort () from /lib64/libc.so.6
#2 0x00007f7eda4acfce in XrdSys::IOEvents::PollE::Begin (this=0x1fd3ce0, syncsem=<value optimized out>, retcode=<value optimized out>,
eTxt=<value optimized out>) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEventsPollE.icc:221
#3 0x00007f7eda4ab7cd in XrdSys::IOEvents::BootStrap::Start (parg=0x7fffc1a450f0) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEvents.cc:131
#4 0x00007f7eda4a8a6f in XrdSysThread_Xeq (myargs=0x1fd2eb0) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysPthread.cc:86
#5 0x00007f7ed9e82aa1 in start_thread () from /lib64/libpthread.so.0
#6 0x00007f7ed8985bcd in clone () from /lib64/libc.so.6
gdb) f 2
#2 0x00007f7eda4acfce in XrdSys::IOEvents::PollE::Begin (this=0x1fd3ce0, syncsem=<value optimized out>, retcode=<value optimized out>,
eTxt=<value optimized out>) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEventsPollE.icc:221
221 abort();
(gdb) l
216 numPoll = numpolled;
217 if (numpolled == 0) CbkTMO();
218 else if (numpolled < 0)
219 {int rc = errno;
220 cerr <<"EPoll: " <<strerror(rc) <<" polling for events" <<endl;
221 abort();
222 }
223 else for (int i = 0; i < numpolled; i++)
224 {if ((cP = (Channel *)pollTab[i].data.ptr))
225 {cbCurr = i; Dispatch(cP, pollTab[i].events);}
(gdb) print rc
$1 = <value optimized out>
(gdb) print numpolled
$2 = -1
(gdb) print errno
$3 = 14
(gdb) print pollTab
$4 = (epoll_event *) 0x1fd6000
(gdb) print *pollTab
$5 = {events = 1, data = {ptr = 0x1fce8c0, fd = 33351872, u32 = 33351872, u64 = 33351872}}
(gdb) print pollMax
$6 = 1024
(gdb) p *(Channel *)pollTab[0].data.ptr
$9 = {chMutex = {<XrdSysMutex> = {cs = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 1, __spins = 0, __list = {__prev = 0x0,
__next = 0x0}}, __size = '\000' <repeats 16 times>, "\001", '\000' <repeats 22 times>, __align = 0}}, <No data fields>}, attList = {
next = 0x1fce8c0, prev = 0x1fce8c0}, tmoList = {next = 0x1fce8c0, prev = 0x1fce8c0}, chPoller = 0x1fd3ce0, chPollXQ = 0x1fd3ce0, chCB = 0x1fce8a0,
chCBA = 0x0, chFD = 10, pollEnt = 0, chRTO = 15, chWTO = 15, rdDL = 1529244092, wrDL = 1529244093, deadLine = 1529244092, dlType = 2 '\002',
chEvents = 5 '\005', chStat = 0 '\000', inTOQ = 1 '\001', inPSet = 1 '\001', reMod = 0 '\000', chFault = 0}
(gdb) print pollDfd
$10 = 9
(gdb) info threads
7 Thread 0x7f7ed275e700 (LWP 11267) 0x00007f7ed9e8a00d in nanosleep () from /lib64/libpthread.so.0
6 Thread 0x7f7ed3b62700 (LWP 11168) 0x00007f7ed9e88a00 in sem_wait () from /lib64/libpthread.so.0
5 Thread 0x7f7ed095b700 (LWP 11270) 0x00007f7ed8982419 in syscall () from /lib64/libc.so.6
4 Thread 0x7f7ed1d5d700 (LWP 11268) 0x00007f7ed8982419 in syscall () from /lib64/libc.so.6
3 Thread 0x7f7edbacd840 (LWP 11160) 0x00007f7ed9e8668c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
2 Thread 0x7f7ed135c700 (LWP 11269) 0x00007f7ed8982419 in syscall () from /lib64/libc.so.6
* 1 Thread 0x7f7ed315f700 (LWP 11266) 0x00007f7ed88cf495 in raise () from /lib64/libc.so.6
```
Error message seen on the client is "EPoll: Bad address polling for events", this is consistent with `errno` and
```
~$ grep EFAULT /usr/include/asm-generic/errno-base.h
#define EFAULT 14 /* Bad address */
```
Per `man epoll_wait`:
```
EFAULT The memory area pointed to by events is not accessible with write permissions.
```
Have a coredump - any more information that you'd need?
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