Description of problem:
xrdfs crashes after command execution.

Version-Release number of selected component (if applicable):
xrootd-client-4.2.3-1.fc23.x86_64

How reproducible:
Every time.

Steps to Reproduce:
1. Run 'xrdfs t3se01.psi.ch ls'
2.
3.

Actual results:
/-help.root
/t3se01.psi.ch:8443
/user
/store
Segmentation fault


Expected results:
xrdfs should not crash.

Additional info:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff4903700 (LWP 17883)]
uw_frame_state_for (context=context@entry=0x7ffff4902d30, fs=fs@entry=0x7ffff4902a80) at ../../../libgcc/unwind-dw2.c:1249
1249          return MD_FALLBACK_FRAME_STATE_FOR (context, fs);
Missing separate debuginfos, use: dnf debuginfo-install keyutils-libs-1.5.9-7.fc23.x86_64 krb5-libs-1.13.2-12.fc23.x86_64 libcom_err-1.42.13-3.fc23.x86_64 libevent-2.0.21-7.fc23.x86_64 libselinux-2.4-4.fc23.x86_64 ncurses-libs-5.9-21.20150214.fc23.x86_64 nss-mdns-0.10-16.fc23.x86_64 openssl-libs-1.0.2d-2.fc23.x86_64 pcre-8.37-5.fc23.x86_64 readline-6.3-6.fc23.x86_64 zlib-1.2.8-9.fc23.x86_64
(gdb) bt full
#0  uw_frame_state_for (context=context@entry=0x7ffff4902d30, fs=fs@entry=0x7ffff4902a80) at ../../../libgcc/unwind-dw2.c:1249
        fde = 0x0
        cie = <optimized out>
        aug = <optimized out>
        insn = <optimized out>
        end = <optimized out>
#1  0x00007ffff69c802b in _Unwind_ForcedUnwind_Phase2 (exc=0x7ffff4903d70, context=0x7ffff4902d30) at ../../../libgcc/unwind.inc:155
        fs = {regs = {reg = {{loc = {reg = 0, offset = 0, exp = 0x0}, how = REG_UNSAVED} <repeats 18 times>}, prev = 0x0, cfa_offset = 0, cfa_reg = 0, 
            cfa_exp = 0x0, cfa_how = CFA_UNSET}, pc = 0x0, personality = 0x0, data_align = 0, code_align = 0, retaddr_column = 0, fde_encoding = 0 '\000', 
          lsda_encoding = 0 '\000', saw_z = 0 '\000', signal_frame = 0 '\000', eh_ptr = 0x0}
        action = <optimized out>
        stop = 0x7ffff7bce520 <unwind_stop>
        stop_argument = 0x7ffff4902f30
        code = <optimized out>
        stop_code = <optimized out>
#2  0x00007ffff69c844d in _Unwind_Resume (exc=0x7ffff4903d70) at ../../../libgcc/unwind.inc:232
        this_context = {reg = {0x7ffff4902e28, 0x7ffff4902e30, 0x0, 0x7ffff4902e38, 0x0, 0x0, 0x7ffff4902e60, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7ffff4902e40, 
            0x7ffff4902e48, 0x7ffff4902e50, 0x7ffff4902e58, 0x7ffff4902e68, 0x0}, cfa = 0x7ffff4902e70, 
          ra = 0x7ffff7994485 <XrdCl::JobManager::RunJobs()+709>, lsda = 0x0, bases = {tbase = 0x0, dbase = 0x0, func = 0x7ffff69c83e0 <_Unwind_Resume>}, 
          flags = 4611686018427387904, version = 0, args_size = 0, by_value = '\000' <repeats 17 times>}
        cur_context = {reg = {0x7ffff4902e28, 0x7ffff4902e30, 0x0, 0x7ffff4902ec8, 0x0, 0x0, 0x7ffff4902ed0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7ffff4902ed8, 
            0x7ffff4902ee0, 0x7ffff4902ee8, 0x7ffff4902ef0, 0x7ffff4902ef8, 0x0}, cfa = 0x7ffff4902f00, ra = 0x800000, lsda = 0x0, bases = {tbase = 0x0, 
            dbase = 0x0, func = 0x7ffff79941c0 <XrdCl::JobManager::RunJobs()>}, flags = 4611686018427387904, version = 0, args_size = 0, 
          by_value = '\000' <repeats 17 times>}
        code = <optimized out>
#3  0x00007ffff7994485 in XrdSys::LinuxSemaphore::Wait (this=<optimized out>) at /usr/src/debug/xrootd-4.2.3/src/XrdSys/XrdSysLinuxSemaphore.hh:175
        r = <optimized out>
        value = <optimized out>
        val = <optimized out>
        waiters = <optimized out>
        cancelType = 0
#4  XrdCl::SyncQueue<XrdCl::JobManager::JobHelper>::Get (this=0x5555557854b8) at /usr/src/debug/xrootd-4.2.3/src/XrdCl/XrdClSyncQueue.hh:67
        i = <optimized out>
#5  XrdCl::JobManager::RunJobs (this=0x5555557854a0) at /usr/src/debug/xrootd-4.2.3/src/XrdCl/XrdClJobManager.cc:146
        h = <optimized out>
#6  0x0000000000800000 in ?? ()
No symbol table info available.
#7  0x0000000000000000 in ?? ()
No symbol table info available.