Hadd: corrupted size vs prev_size problem

I’ve been having random problems merging files using hadd, with the error message below showing up seemingly erratically. I’m using standard root objects (TH1Fs and TTrees) as output and so far I haven’t been able to pinpoint why this would occasionally work and occasionally fail. Is there maybe any chance someone found this error before or has any hint about what this could be? Thanks in advance!

*** Error in `hadd': corrupted size vs. prev_size: 0x0000000002d240f0 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f27b8d957e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x80dfb)[0x7f27b8d9edfb]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f27b8da253c]
/home/daviddc/wonderland/root/obj/lib/libCore.so(_ZN9TObjArrayD1Ev+0x2d)[0x7f27b9e77e5d]
/home/daviddc/wonderland/root/obj/lib/libTree.so(_ZN5TTreeD2Ev+0x3cb)[0x7f27bae098ab]
/home/daviddc/wonderland/root/obj/lib/libTree.so(_ZN5TTreeD0Ev+0x9)[0x7f27bae09a19]
/home/daviddc/wonderland/root/obj/lib/libCore.so(_ZN5TList6DeleteEPKc+0x873)[0x7f27b9e6cff3]
/home/daviddc/wonderland/root/obj/lib/libRIO.so(_ZN11TFileMerger14MergeRecursiveEP10TDirectoryP5TListi+0xcad)[0x7f27ba34869d]
/home/daviddc/wonderland/root/obj/lib/libRIO.so(_ZN11TFileMerger12PartialMergeEi+0x101)[0x7f27ba3472e1]
hadd[0x407ac3]
hadd[0x404780]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f27b8d3e830]
hadd(_start+0x29)[0x406f09]
======= Memory map: ========
00400000-0040d000 r-xp 00000000 08:32 28140398                           /home/daviddc/wonderland/root/obj/bin/hadd
0060c000-0060d000 r--p 0000c000 08:32 28140398                           /home/daviddc/wonderland/root/obj/bin/hadd
0060d000-0060e000 rw-p 0000d000 08:32 28140398                           /home/daviddc/wonderland/root/obj/bin/hadd
024ac000-117d4000 rw-p 00000000 00:00 0                                  [heap]
7f27a4000000-7f27a4021000 rw-p 00000000 00:00 0 
7f27a4021000-7f27a8000000 ---p 00000000 00:00 0 
7f27ab4f5000-7f27ab519000 r-xp 00000000 08:32 24118916                   /lib/x86_64-linux-gnu/libpng12.so.0.54.0
7f27ab519000-7f27ab718000 ---p 00024000 08:32 24118916                   /lib/x86_64-linux-gnu/libpng12.so.0.54.0
7f27ab718000-7f27ab719000 r--p 00023000 08:32 24118916                   /lib/x86_64-linux-gnu/libpng12.so.0.54.0
7f27ab719000-7f27ab71a000 rw-p 00024000 08:32 24118916                   /lib/x86_64-linux-gnu/libpng12.so.0.54.0
7f27ab71a000-7f27ab892000 r-xp 00000000 08:32 28140292                   /home/daviddc/wonderland/root/obj/lib/libMatrix.so
7f27ab892000-7f27aba91000 ---p 00178000 08:32 28140292                   /home/daviddc/wonderland/root/obj/lib/libMatrix.so
7f27aba91000-7f27aba99000 r--p 00177000 08:32 28140292                   /home/daviddc/wonderland/root/obj/lib/libMatrix.so
7f27aba99000-7f27aba9b000 rw-p 0017f000 08:32 28140292                   /home/daviddc/wonderland/root/obj/lib/libMatrix.so
7f27aba9b000-7f27aba9f000 rw-p 00000000 00:00 0 
7f27aba9f000-7f27abb43000 r-xp 00000000 08:32 23987292                   /usr/lib/x86_64-linux-gnu/libfreetype.so.6.12.1
7f27abb43000-7f27abd42000 ---p 000a4000 08:32 23987292                   /usr/lib/x86_64-linux-gnu/libfreetype.so.6.12.1
7f27abd42000-7f27abd48000 r--p 000a3000 08:32 23987292                   /usr/lib/x86_64-linux-gnu/libfreetype.so.6.12.1
7f27abd48000-7f27abd49000 rw-p 000a9000 08:32 23987292                   /usr/lib/x86_64-linux-gnu/libfreetype.so.6.12.1
7f27abd49000-7f27abf44000 r-xp 00000000 08:32 28140258                   /home/daviddc/wonderland/root/obj/lib/libMathCore.so
7f27abf44000-7f27ac143000 ---p 001fb000 08:32 28140258                   /home/daviddc/wonderland/root/obj/lib/libMathCore.so
7f27ac143000-7f27ac14d000 r--p 001fa000 08:32 28140258                   /home/daviddc/wonderland/root/obj/lib/libMathCore.so
7f27ac14d000-7f27ac150000 rw-p 00204000 08:32 28140258                   /home/daviddc/wonderland/root/obj/lib/libMathCore.so
7f27ac150000-7f27ac15a000 rw-p 00000000 00:00 0 
7f27ac15a000-7f27ac4fc000 r-xp 00000000 08:32 28140308                   /home/daviddc/wonderland/root/obj/lib/libHist.so
7f27ac4fc000-7f27ac6fb000 ---p 003a2000 08:32 28140308                   /home/daviddc/wonderland/root/obj/lib/libHist.so
7f27ac6fb000-7f27ac724000 r--p 003a1000 08:32 28140308                   /home/daviddc/wonderland/root/obj/lib/libHist.so
7f27ac724000-7f27ac728000 rw-p 003ca000 08:32 28140308                   /home/daviddc/wonderland/root/obj/lib/libHist.so
7f27ac728000-7f27ac733000 rw-p 00000000 00:00 0 
7f27ac733000-7f27ac87b000 r-xp 00000000 08:32 28140331                   /home/daviddc/wonderland/root/obj/lib/libGraf.so
7f27ac87b000-7f27aca7a000 ---p 00148000 08:32 28140331                   /home/daviddc/wonderland/root/obj/lib/libGraf.so
7f27aca7a000-7f27aca88000 r--p 00147000 08:32 28140331                   /home/daviddc/wonderland/root/obj/lib/libGraf.so
7f27aca88000-7f27aca8c000 rw-p 00155000 08:32 28140331                   /home/daviddc/wonderland/root/obj/lib/libGraf.so
7f27aca8c000-7f27aca9a000 rw-p 00000000 00:00 0 
7f27aca9a000-7f27acb64000 r-xp 00000000 08:32 28140365                   /home/daviddc/wonderland/root/obj/lib/libGpad.so
7f27acb64000-7f27acd63000 ---p 000ca000 08:32 28140365                   /home/daviddc/wonderland/root/obj/lib/libGpad.so
7f27acd63000-7f27acd6d000 r--p 000c9000 08:32 28140365                   /home/daviddc/wonderland/root/obj/lib/libGpad.so
7f27acd6d000-7f27acd6f000 rw-p 000d3000 08:32 28140365                   /home/daviddc/wonderland/root/obj/lib/libGpad.so
7f27acd6f000-7f27acd70000 rw-p 00000000 00:00 0 
7f27acd70000-7f27ace11000 r-xp 00000000 08:32 28140389                   /home/daviddc/wonderland/root/obj/lib/libGraf3d.so
7f27ace11000-7f27ad010000 ---p 000a1000 08:32 28140389                   /home/daviddc/wonderland/root/obj/lib/libGraf3d.so
7f27ad010000-7f27ad01a000 r--p 000a0000 08:32 28140389                   /home/daviddc/wonderland/root/obj/lib/libGraf3d.so
7f27ad01a000-7f27ad01c000 rw-p 000aa000 08:32 28140389                   /home/daviddc/wonderland/root/obj/lib/libGraf3d.so
7f27ad01c000-7f27ad020000 rw-p 00000000 00:00 0 
7f27ad020000-7f27ad17a000 r-xp 00000000 08:32 28140408                   /home/daviddc/wonderland/root/obj/lib/libTreePlayer.so
7f27ad17a000-7f27ad37a000 ---p 0015a000 08:32 28140408                   /home/daviddc/wonderland/root/obj/lib/libTreePlayer.so
7f27ad37a000-7f27ad384000 r--p 0015a000 08:32 28140408                   /home/daviddc/wonderland/root/obj/lib/libTreePlayer.so
7f27ad384000-7f27ad386000 rw-p 00164000 08:32 28140408                   /home/daviddc/wonderland/root/obj/lib/libTreePlayer.so
7f27ad386000-7f27ad38d000 rw-p 00000000 00:00 0 
7f27ad38d000-7f27ad3b3000 r-xp 00000000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27ad3b3000-7f27ad5b2000 ---p 00026000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27ad5b2000-7f27ad5b3000 r--p 00025000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27ad5b3000-7f27ad5b4000 rw-p 00026000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27ad5b4000-7f27ae228000 rw-p 00000000 00:00 0 
7f27ae228000-7f27b3dd7000 r--p 00000000 08:32 28140506                   /home/daviddc/wonderland/root/obj/etc/allDict.cxx.pch
7f27b3dd7000-7f27b3dfc000 r-xp 00000000 08:32 24121919                   /lib/x86_64-linux-gnu/libtinfo.so.5.9
7f27b3dfc000-7f27b3ffb000 ---p 00025000 08:32 24121919                   /lib/x86_64-linux-gnu/libtinfo.so.5.9
7f27b3ffb000-7f27b3fff000 r--p 00024000 08:32 24121919                   /lib/x86_64-linux-gnu/libtinfo.so.5.9
7f27b3fff000-7f27b4000000 rw-p 00028000 08:32 24121919                   /lib/x86_64-linux-gnu/libtinfo.so.5.9
7f27b4000000-7f27b6cea000 r-xp 00000000 08:32 28139430                   /home/daviddc/wonderland/root/obj/lib/libCling.so
7f27b6cea000-7f27b6eea000 ---p 02cea000 08:32 28139430                   /home/daviddc/wonderland/root/obj/lib/libCling.so
7f27b6eea000-7f27b70cc000 r--p 02cea000 08:32 28139430                   /home/daviddc/wonderland/root/obj/lib/libCling.so
7f27b70cc000-7f27b70d7000 rw-p 02ecc000 08:32 28139430                   /home/daviddc/wonderland/root/obj/lib/libCling.so
7f27b70d7000-7f27b7100000 rw-p 00000000 00:00 0 
7f27b7100000-7f27b710b000 r-xp 00000000 08:32 24132624                   /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f27b710b000-7f27b730a000 ---p 0000b000 08:32 24132624                   /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f27b730a000-7f27b730b000 r--p 0000a000 08:32 24132624                   /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f27b730b000-7f27b730c000 rw-p 0000b000 08:32 24132624                   /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f27b730c000-7f27b7312000 rw-p 00000000 00:00 0 
7f27b7312000-7f27b731d000 r-xp 00000000 08:32 24132617                   /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f27b731d000-7f27b751c000 ---p 0000b000 08:32 24132617                   /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f27b751c000-7f27b751d000 r--p 0000a000 08:32 24132617                   /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f27b751d000-7f27b751e000 rw-p 0000b000 08:32 24132617                   /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f27b751e000-7f27b7534000 r-xp 00000000 08:32 24132622                   /lib/x86_64-linux-gnu/libnsl-2.23.so
7f27b7534000-7f27b7733000 ---p 00016000 08:32 24132622                   /lib/x86_64-linux-gnu/libnsl-2.23.so
7f27b7733000-7f27b7734000 r--p 00015000 08:32 24132622                   /lib/x86_64-linux-gnu/libnsl-2.23.so
7f27b7734000-7f27b7735000 rw-p 00016000 08:32 24132622                   /lib/x86_64-linux-gnu/libnsl-2.23.so
7f27b7735000-7f27b7737000 rw-p 00000000 00:00 0 
7f27b7737000-7f27b773f000 r-xp 00000000 08:32 24132628                   /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f27b773f000-7f27b793e000 ---p 00008000 08:32 24132628                   /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f27b793e000-7f27b793f000 r--p 00007000 08:32 24132628                   /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f27b793f000-7f27b7940000 rw-p 00008000 08:32 24132628                   /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f27b7940000-7f27b7977000 r-xp 00000000 08:32 28139321                   /home/daviddc/wonderland/root/obj/lib/libtbb.so.2
7f27b7977000-7f27b7b77000 ---p 00037000 08:32 28139321                   /home/daviddc/wonderland/root/obj/lib/libtbb.so.2
7f27b7b77000-7f27b7b78000 r--p 00037000 08:32 28139321                   /home/daviddc/wonderland/root/obj/lib/libtbb.so.2
7f27b7b78000-7f27b7b7a000 rw-p 00038000 08:32 28139321                   /home/daviddc/wonderland/root/obj/lib/libtbb.so.2
7f27b7b7a000-7f27b7b7d000 rw-p 00000000 00:00 0 
7f27b7b7d000-7f27b7b96000 r-xp 00000000 08:32 24117448                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7f27b7b96000-7f27b7d95000 ---p 00019000 08:32 24117448                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7f27b7d95000-7f27b7d96000 r--p 00018000 08:32 24117448                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7f27b7d96000-7f27b7d97000 rw-p 00019000 08:32 24117448                   /lib/x86_64-linux-gnu/libz.so.1.2.8
7f27b7d97000-7f27b7e05000 r-xp 00000000 08:32 24121876                   /lib/x86_64-linux-gnu/libpcre.so.3.13.2
7f27b7e05000-7f27b8005000 ---p 0006e000 08:32 24121876                   /lib/x86_64-linux-gnu/libpcre.so.3.13.2
7f27b8005000-7f27b8006000 r--p 0006e000 08:32 24121876                   /lib/x86_64-linux-gnu/libpcre.so.3.13.2
7f27b8006000-7f27b8007000 rw-p 0006f000 08:32 24121876                   /lib/x86_64-linux-gnu/libpcre.so.3.13.2
7f27b8007000-7f27b8222000 r-xp 00000000 08:32 24117333                   /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f27b8222000-7f27b8421000 ---p 0021b000 08:32 24117333                   /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f27b8421000-7f27b843d000 r--p 0021a000 08:32 24117333                   /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f27b843d000-7f27b8449000 rw-p 00236000 08:32 24117333                   /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f27b8449000-7f27b844c000 rw-p 00000000 00:00 0 
7f27b844c000-7f27b84aa000 r-xp 00000000 08:32 24117484                   /lib/x86_64-linux-gnu/libssl.so.1.0.0
7f27b84aa000-7f27b86aa000 ---p 0005e000 08:32 24117484                   /lib/x86_64-linux-gnu/libssl.so.1.0.0
7f27b86aa000-7f27b86ae000 r--p 0005e000 08:32 24117484                   /lib/x86_64-linux-gnu/libssl.so.1.0.0
7f27b86ae000-7f27b86b5000 rw-p 00062000 08:32 24117484                   /lib/x86_64-linux-gnu/libssl.so.1.0.0
7f27b86b5000-7f27b86b8000 r-xp 00000000 08:32 24132612                   /lib/x86_64-linux-gnu/libdl-2.23.so
7f27b86b8000-7f27b88b7000 ---p 00003000 08:32 24132612                   /lib/x86_64-linux-gnu/libdl-2.23.so
7f27b88b7000-7f27b88b8000 r--p 00002000 08:32 24132612                   /lib/x86_64-linux-gnu/libdl-2.23.so
7f27b88b8000-7f27b88b9000 rw-p 00003000 08:32 24132612                   /lib/x86_64-linux-gnu/libdl-2.23.so
7f27b88b9000-7f27b890a000 r-xp 00000000 08:32 28139488                   /home/daviddc/wonderland/root/obj/lib/libThread.so
7f27b890a000-7f27b8b09000 ---p 00051000 08:32 28139488                   /home/daviddc/wonderland/root/obj/lib/libThread.so
7f27b8b09000-7f27b8b0d000 r--p 00050000 08:32 28139488                   /home/daviddc/wonderland/root/obj/lib/libThread.so
7f27b8b0d000-7f27b8b0e000 rw-p 00054000 08:32 28139488                   /home/daviddc/wonderland/root/obj/lib/libThread.so
7f27b8b0e000-7f27b8b10000 rw-p 00000000 00:00 0 
7f27b8b10000-7f27b8b1c000 r-xp 00000000 08:32 28139497                   /home/daviddc/wonderland/root/obj/lib/libImt.so
7f27b8b1c000-7f27b8d1c000 ---p 0000c000 08:32 28139497                   /home/daviddc/wonderland/root/obj/lib/libImt.so
7f27b8d1c000-7f27b8d1d000 r--p 0000c000 08:32 28139497                   /home/daviddc/wonderland/root/obj/lib/libImt.so
7f27b8d1d000-7f27b8d1e000 rw-p 0000d000 08:32 28139497                   /home/daviddc/wonderland/root/obj/lib/libImt.so
7f27b8d1e000-7f27b8ede000 r-xp 00000000 08:32 24132627                   /lib/x86_64-linux-gnu/libc-2.23.so
7f27b8ede000-7f27b90de000 ---p 001c0000 08:32 24132627                   /lib/x86_64-linux-gnu/libc-2.23.so
7f27b90de000-7f27b90e2000 r--p 001c0000 08:32 24132627                   /lib/x86_64-linux-gnu/libc-2.23.so
7f27b90e2000-7f27b90e4000 rw-p 001c4000 08:32 24132627                   /lib/x86_64-linux-gnu/libc-2.23.so
7f27b90e4000-7f27b90e8000 rw-p 00000000 00:00 0 
7f27b90e8000-7f27b9100000 r-xp 00000000 08:32 24132614                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f27b9100000-7f27b92ff000 ---p 00018000 08:32 24132614                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f27b92ff000-7f27b9300000 r--p 00017000 08:32 24132614                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f27b9300000-7f27b9301000 rw-p 00018000 08:32 24132614                   /lib/x86_64-linux-gnu/libpthread-2.23.so
7f27b9301000-7f27b9305000 rw-p 00000000 00:00 0 
7f27b9305000-7f27b931b000 r-xp 00000000 08:32 24121785                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f27b931b000-7f27b951a000 ---p 00016000 08:32 24121785                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f27b951a000-7f27b951b000 rw-p 00015000 08:32 24121785                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f27b951b000-7f27b9623000 r-xp 00000000 08:32 24132630                   /lib/x86_64-linux-gnu/libm-2.23.so
7f27b9623000-7f27b9822000 ---p 00108000 08:32 24132630                   /lib/x86_64-linux-gnu/libm-2.23.so
7f27b9822000-7f27b9823000 r--p 00107000 08:32 24132630                   /lib/x86_64-linux-gnu/libm-2.23.so
7f27b9823000-7f27b9824000 rw-p 00108000 08:32 24132630                   /lib/x86_64-linux-gnu/libm-2.23.so
7f27b9824000-7f27b9996000 r-xp 00000000 08:32 23988226                   /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f27b9996000-7f27b9b96000 ---p 00172000 08:32 23988226                   /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f27b9b96000-7f27b9ba0000 r--p 00172000 08:32 23988226                   /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f27b9ba0000-7f27b9ba2000 rw-p 0017c000 08:32 23988226                   /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f27b9ba2000-7f27b9ba6000 rw-p 00000000 00:00 0 
7f27b9ba6000-7f27b9ff9000 r-xp 00000000 08:32 28139434                   /home/daviddc/wonderland/root/obj/lib/libCore.so
7f27b9ff9000-7f27ba1f8000 ---p 00453000 08:32 28139434                   /home/daviddc/wonderland/root/obj/lib/libCore.so
7f27ba1f8000-7f27ba221000 r--p 00452000 08:32 28139434                   /home/daviddc/wonderland/root/obj/lib/libCore.so
7f27ba221000-7f27ba22a000 rw-p 0047b000 08:32 28139434                   /home/daviddc/wonderland/root/obj/lib/libCore.so
7f27ba22a000-7f27ba25f000 rw-p 00000000 00:00 0 
7f27ba25f000-7f27ba62d000 r-xp 00000000 08:32 28139500                   /home/daviddc/wonderland/root/obj/lib/libRIO.so
7f27ba62d000-7f27ba82c000 ---p 003ce000 08:32 28139500                   /home/daviddc/wonderland/root/obj/lib/libRIO.so
7f27ba82c000-7f27ba839000 r--p 003cd000 08:32 28139500                   /home/daviddc/wonderland/root/obj/lib/libRIO.so
7f27ba839000-7f27ba83c000 rw-p 003da000 08:32 28139500                   /home/daviddc/wonderland/root/obj/lib/libRIO.so
7f27ba83c000-7f27ba83f000 rw-p 00000000 00:00 0 
7f27ba83f000-7f27ba906000 r-xp 00000000 08:32 28140236                   /home/daviddc/wonderland/root/obj/lib/libNet.so
7f27ba906000-7f27bab06000 ---p 000c7000 08:32 28140236                   /home/daviddc/wonderland/root/obj/lib/libNet.so
7f27bab06000-7f27bab12000 r--p 000c7000 08:32 28140236                   /home/daviddc/wonderland/root/obj/lib/libNet.so
7f27bab12000-7f27bab14000 rw-p 000d3000 08:32 28140236                   /home/daviddc/wonderland/root/obj/lib/libNet.so
7f27bab14000-7f27bab1b000 rw-p 00000000 00:00 0 
7f27bab1b000-7f27bab2a000 r-xp 00000000 08:32 28140254                   /home/daviddc/wonderland/root/obj/lib/libMultiProc.so
7f27bab2a000-7f27bad29000 ---p 0000f000 08:32 28140254                   /home/daviddc/wonderland/root/obj/lib/libMultiProc.so
7f27bad29000-7f27bad2a000 r--p 0000e000 08:32 28140254                   /home/daviddc/wonderland/root/obj/lib/libMultiProc.so
7f27bad2a000-7f27bad2b000 rw-p 0000f000 08:32 28140254                   /home/daviddc/wonderland/root/obj/lib/libMultiProc.so
7f27bad2b000-7f27bae8f000 r-xp 00000000 08:32 28140257                   /home/daviddc/wonderland/root/obj/lib/libTree.so
7f27bae8f000-7f27bb08e000 ---p 00164000 08:32 28140257                   /home/daviddc/wonderland/root/obj/lib/libTree.so
7f27bb08e000-7f27bb09d000 r--p 00163000 08:32 28140257                   /home/daviddc/wonderland/root/obj/lib/libTree.so
7f27bb09d000-7f27bb0a0000 rw-p 00172000 08:32 28140257                   /home/daviddc/wonderland/root/obj/lib/libTree.so
7f27bb0a0000-7f27bb0a4000 rw-p 00000000 00:00 0 
7f27bb0a4000-7f27bb0ca000 r-xp 00000000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27bb14a000-7f27bb17c000 rw-p 00000000 00:00 0 
7f27bb1cf000-7f27bb2a8000 rw-p 00000000 00:00 0 
7f27bb2a8000-7f27bb2c4000 r-xp 00000000 00:00 0 
7f27bb2c4000-7f27bb2c5000 rw-p 00000000 00:00 0 
7f27bb2c5000-7f27bb2c7000 r-xp 00000000 00:00 0 
7f27bb2c7000-7f27bb2c9000 rw-p 00000000 00:00 0 
7f27bb2c9000-7f27bb2ca000 r--p 00025000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27bb2ca000-7f27bb2cb000 rw-p 00026000 08:32 24132613                   /lib/x86_64-linux-gnu/ld-2.23.so
7f27bb2cb000-7f27bb2cc000 rw-p 00000000 00:00 0 
7fffbb83b000-7fffbb85f000 rw-p 00000000 00:00 0                          [stack]
7fffbb9da000-7fffbb9dd000 r--p 00000000 00:00 0                          [vvar]
7fffbb9dd000-7fffbb9df000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted (core dumped)

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ROOT Version: 6.15
Platform: Ubuntu 16.04.6 LTS
Compiler: gcc version 5.4.0 20160609


To pinpoint the problem try using valgrind:

valgrind --suppressions=$ROOTSYS/etc/vagrind-root.supp hadd ... 

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