GDB output:
(gdb) r -debug
Starting program: /usr/local/bin/bitcoind -debug
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff5238700 (LWP 17767)]
[New Thread 0x7ffff4a37700 (LWP 17768)]
[New Thread 0x7fffeffff700 (LWP 17769)]
[New Thread 0x7fffef7fe700 (LWP 17770)]
[New Thread 0x7fffeeffd700 (LWP 17771)]
[New Thread 0x7fffee7fc700 (LWP 17772)]
[New Thread 0x7fffedffb700 (LWP 17773)]
[New Thread 0x7fffed7fa700 (LWP 17774)]
[New Thread 0x7fffecff9700 (LWP 17775)]
[New Thread 0x7fffcffff700 (LWP 17776)]
[New Thread 0x7fffcf7fe700 (LWP 17777)]
[New Thread 0x7fffceffd700 (LWP 17778)]
Program received signal SIGSEGV, Segmentation fault.
strlen () at ../sysdeps/x86_64/strlen.S:106
106 ../sysdeps/x86_64/strlen.S: No such file or directory.
(gdb) bt
[#0](/bitcoin-bitcoin/0/) strlen () at ../sysdeps/x86_64/strlen.S:106
[#1](/bitcoin-bitcoin/1/) 0x00007ffff70bace2 in __os_strdup () from /usr/lib/libdb_cxx-4.8.so
[#2](/bitcoin-bitcoin/2/) 0x00007ffff708d6b4 in __env_add_data_dir () from /usr/lib/libdb_cxx-4.8.so
[#3](/bitcoin-bitcoin/3/) 0x00007ffff708d781 in __env_set_data_dir () from /usr/lib/libdb_cxx-4.8.so
[#4](/bitcoin-bitcoin/4/) 0x00007ffff6fac5d5 in DbEnv::set_data_dir(char const*) () from /usr/lib/libdb_cxx-4.8.so
[#5](/bitcoin-bitcoin/5/) 0x00005555557cf191 in CDBEnv::Open (this=0x555555c004a0 <bitdb>, pathIn=...) at wallet/db.cpp:92
[#6](/bitcoin-bitcoin/6/) 0x0000555555816a01 in CWallet::Verify (walletFile="wallet.dat", warningString="", errorString="") at wallet/wallet.cpp:353
[#7](/bitcoin-bitcoin/7/) 0x00005555555ab574 in AppInit2 (threadGroup=..., scheduler=...) at init.cpp:957
[#8](/bitcoin-bitcoin/8/) 0x000055555558ffe9 in AppInit (argc=<optimized out>, argv=<optimized out>) at bitcoind.cpp:147
[#9](/bitcoin-bitcoin/9/) 0x000055555558736f in main (argc=2, argv=0x7fffffffe6e8) at bitcoind.cpp:176
Logfile Output:
2015-10-07 16:30:21 Bitcoin version v0.11.0 (2015-07-10 19:23:55 +0200)
2015-10-07 16:30:21 Using OpenSSL version OpenSSL 1.0.2d 9 Jul 2015
2015-10-07 16:30:21 Using BerkeleyDB version Berkeley DB 4.8.30: (April 9, 2010)
2015-10-07 16:30:21 Default data directory /home/bitnode/.bitcoin
2015-10-07 16:30:21 Using data directory /home/bitnode/.bitcoin
2015-10-07 16:30:21 Using config file /home/bitnode/.bitcoin/bitcoin.conf
2015-10-07 16:30:21 Using at most 700 connections (65536 file descriptors available)
2015-10-07 16:30:21 Using 8 threads for script verification
2015-10-07 16:30:21 scheduler thread start
2015-10-07 16:30:21 Allowing RPC connections from: 127.0.0.0/255.0.0.0 ::1/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
2015-10-07 16:30:21 Binding RPC on address ::1 port 8332 (IPv4+IPv6 bind any: 0)
2015-10-07 16:30:21 Binding RPC on address 127.0.0.1 port 8332 (IPv4+IPv6 bind any: 0)
2015-10-07 16:30:21 Using wallet wallet.dat
2015-10-07 16:30:21 init message: Verifying wallet...
2015-10-07 16:30:21 CDBEnv::Open: LogDir=/home/bitnode/.bitcoin/database ErrorFile=/home/bitnode/.bitcoin/db.log