Ajuda urgente, eles me atacam crasheando o servidor

Bom desde ontem, nosso servidor com mais de 300 jogadores está sofrendo um ataque de um grupo de ódio e inveja em relação ao nosso crescimento, não temos idéia do que eles estão fazendo para travar o servidor, mas anexaram o log.

Agradeço sua ajuda urgente.

Signal caught: SIGSEGV in 11/05 - 05:40:14

Thread 4 (Thread 0x7fffebfff700 (LWP 53190)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007ffff631150c in std::condition_variable::wait(std::unique_lock<std::mutex>&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#2  0x00005555557112df in DatabaseTasks::threadMain() ()
No symbol table info available.
#3  0x00007ffff6316e6f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#4  0x00007ffff65e64a4 in start_thread (arg=0x7fffebfff700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7fffebfff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737152808704, 4796436392901787467, 140737246902782, 140737246902783, 140737144418304, 3, -4796462781682761909, -4796419638551330997}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007ffff5a8bd0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
No locals.

Thread 3 (Thread 0x7ffff11bb700 (LWP 53189)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
No locals.
#1  0x000055555563a550 in Scheduler::threadMain() ()
No symbol table info available.
#2  0x00007ffff6316e6f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#3  0x00007ffff65e64a4 in start_thread (arg=0x7ffff11bb700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7ffff11bb700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737238513408, 4796436392901787467, 140737488346430, 140737488346431, 140737230123008, 3, -4796404745937174709, -4796419638551330997}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#4  0x00007ffff5a8bd0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
No locals.

Thread 2 (Thread 0x7ffff19bc700 (LWP 53188)):
#0  0x0000555555637f0c in Reward::getParent() const ()
No symbol table info available.
#1  0x000055555574630f in Item::getTopParent() const ()
No symbol table info available.
#2  0x0000555555746396 in Item::getTile() const ()
No symbol table info available.
#3  0x0000555555643b1a in Thing::getPosition() const ()
No symbol table info available.
#4  0x00005555556584b4 in Player::postAddNotification(Thing*, Cylinder const*, int, cylinderlink_t) ()
No symbol table info available.
#5  0x0000555555762ae8 in Tile::postAddNotification(Thing*, Cylinder const*, int, cylinderlink_t) ()
No symbol table info available.
#6  0x0000555555625550 in Map::moveCreature(Creature&, Tile&, bool) ()
No symbol table info available.
#7  0x00005555557069e4 in Game::internalMoveCreature(Creature&, Tile&, unsigned int) ()
No symbol table info available.
#8  0x00005555556df4e1 in Creature::onCreatureWalk() ()
No symbol table info available.
#9  0x00005555556e0794 in Game::checkCreatureWalk(unsigned int) ()
No symbol table info available.
#10 0x00005555556deec5 in Creature::addEventWalk(bool) ()
No symbol table info available.
#11 0x00005555556df093 in Creature::startAutoWalk(std::forward_list<Direction, std::allocator<Direction> > const&) ()
No symbol table info available.
#12 0x00005555557057c1 in Game::playerAutoWalk(unsigned int, std::forward_list<Direction, std::allocator<Direction> > const&) ()
No symbol table info available.
#13 0x00005555556453eb in Dispatcher::threadMain() ()
No symbol table info available.
#14 0x00007ffff6316e6f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#15 0x00007ffff65e64a4 in start_thread (arg=0x7ffff19bc700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7ffff19bc700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737246906112, 4796436392901787467, 140737488346430, 140737488346431, 140737238515712, 3, -4796405844911931573, -4796419638551330997}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#16 0x00007ffff5a8bd0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
No locals.

Thread 1 (Thread 0x7ffff7fe5bc0 (LWP 53184)):
#0  0x00007ffff5a8c303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00005555555a0669 in main ()