C++ Crash Bug

[Fortera Global]

I dont know how its happens yet, but we have a log:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x633175d38700 (LWP 27841)]
operator<< <char, std::char_traits<char>, std::allocator<char> > (__str=<error reading variable: Cannot access memory at address 0x7272616d202d205a>,
    __os=...) at /usr/include/c++/4.8/bits/basic_string.h:2758
2758          return __ostream_insert(__os, __str.data(), __str.size());
(gdb) bt full
#0  operator<< <char, std::char_traits<char>, std::allocator<char> > (__str=<error reading variable: Cannot access memory at address 0x7272616d202d205a>,
    __os=...) at /usr/include/c++/4.8/bits/basic_string.h:2758
No locals.
#1  Player::getDescription (this=0x633113073600, lookDistance=1) at player.cpp:319
        memberCount = <optimized out>
        s = <incomplete type>
#2  0x00000000004d0521 in LuaScriptInterface::luaCreatureGetDescription (L=0x40000378) at luascript.cpp:7502
        distance = 1
        creature = <optimized out>
#3  0x0000633177bb5a9b in ?? () from /usr/lib/x86_64-linux-gnu/libluajit-5.1.so.2
No symbol table info available.
#4  0x0000633177bf8d00 in lua_pcall () from /usr/lib/x86_64-linux-gnu/libluajit-5.1.so.2
No symbol table info available.
#5  0x0000000000525693 in protectedCall (nresults=0, nargs=4, L=0x40000378) at luascript.cpp:299
        error_index = 4
        ret = <optimized out>
#6  LuaScriptInterface::callVoidFunction (this=this@entry=0x25f8d00, params=params@entry=4) at luascript.cpp:556
        size = 8
#7  0x000000000045c3c1 in Events::eventPlayerOnLook (this=0x25f8d00, player=player@entry=0x6330ed672100, position=..., thing=thing@entry=0x633113073600,
    stackpos=stackpos@entry=1 '\001', lookDistance=1) at events.cpp:413
No locals.
#8  0x000000000047a038 in Game::playerLookAt (this=<optimized out>, playerId=<optimized out>, pos=..., stackPos=<optimized out>) at game.cpp:3204
        thingPos = {x = 33275, y = 32390, z = 8 '\b'}
        playerPos = <optimized out>
        lookDistance = <optimized out>
        player = 0x6330ed672100
        thing = 0x633113073600
#9  0x00000000005ba628 in operator() (this=0x6330472eef80) at /usr/include/c++/4.8/functional:2471
No locals.
#10 operator() (this=0x6330472eef70) at tasks.h:42
No locals.
#11 Dispatcher::threadMain (this=0x856cc0 <g_dispatcher>) at tasks.cpp:50
        task = 0x6330472eef70
        taskLockUnique = {_M_device = 0x856cd8 <g_dispatcher+24>, _M_owns = false}
#12 0x0000633176d5da60 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#13 0x0000633175d94184 in start_thread (arg=0x633175d38700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x633175d38700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {109064081344256, -6976274802886025917, 1, 0, 109064081344960, 109064081344256, 6434976058805083459,
                6434976145403436355}, 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"
#14 0x00006331764c4ffd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

hastebin

someone know why its happens? tfs 1.2

thanks

 

[silveralol]

what have in position(x = 33275, y = 32390, z = 8) ?

 

[Fortera Global]

what have in position(x = 33275, y = 32390, z = 8) ?

one normal ground

 

[klenio0]

Any solution ?

 

[gudan garam]

Maybe see what is in 0x633113073600, since that is what the player was looking at. Also 0x6330ed672100 so you can find which player was it.

 

[klenio0]

what would be the right command in gdb?

p (Player*)0x6330ed672100

print $1*name

player name, right?

how to use 0x633113073600?

p (Player*)0x633113073600

print $2*(?????)

 

[pasiak12]

Seems like it tried to create std::string from invalid data in getDescription method. I'd suggest to add some security checks there

 

[klenio0]

how to make ?