AlliedModders - L4D2 Server Crash

AlliedModders (https://forums.alliedmods.net/index.php)

- Source Servers (SRCDS) (https://forums.alliedmods.net/forumdisplay.php?f=130)

- - L4D2 Server Crash (https://forums.alliedmods.net/showthread.php?t=279382)

L4D2 Server Crash

What the reason this crash?

Code:

server_srv.so!CSoundPatch::ChangePitch(float, float) + 0x6

https://crash.limetech.org/3ttvwl5bmp3a

Please, help me..

Re: L4D2 Server Crash

It's actually...
Chainsaw crashes server after update ~2.1.4.3
Full dump:

Code:

0        server_srv.so!CSoundPatch::ChangePitch(float, float) + 0x6

1        server_srv.so!CChainsaw::ItemPostFrame() + 0x7f8

2        server_srv.so!CBasePlayer::ItemPostFrame() + 0x47f

3        server_srv.so!CTerrorPlayer::ItemPostFrame() + 0xba

4        server_srv.so!CBasePlayer::PostThink() + 0xe3b

5        server_srv.so!CCSPlayer::PostThink() + 0xc5

6        server_srv.so!CTerrorPlayer::PostThink() + 0x140

7        server_srv.so!CPlayerMove::RunPostThink(CBasePlayer*) + 0xb7

8        server_srv.so!CPlayerMove::RunCommand(CBasePlayer*, CUserCmd*, IMoveHelper*) + 0x6ce

9        server_srv.so!CBasePlayer::PlayerRunCommand(CUserCmd*, IMoveHelper*) + 0x9c

10        server_srv.so!CCSPlayer::PlayerRunCommand(CUserCmd*, IMoveHelper*) + 0x1d9

11        server_srv.so!CTerrorPlayer::PlayerRunCommand(CUserCmd*, IMoveHelper*) + 0x323

On the server, there are no plug-ins, which would affect the chainsaw. The server falls after, when a lot of players have a chainsaw, and at the same time beginning to use it. The server stops responding, the var rises, falls fps and server crashes.
Any ideas?... :(

Re: L4D2 Server Crash

strelok74 from l4dnation? ^^

no idea, sorry or test it: remove chainsaw?

Re: L4D2 Server Crash

Remove chainsaw - no crashes :) But I would like to find ways to fix it, possibly through NormalSHook?

Re: L4D2 Server Crash

The problem is still relevant. New crash dump:

Code:

0        server_srv.so + 0x48d1a6

1        server_srv.so + 0x5010a8

2        server_srv.so + 0x3ed16f

3        server_srv.so + 0x4c1afa

4        server_srv.so + 0x76133b

5        server_srv.so + 0x617425

6        server_srv.so + 0x975670

7        server_srv.so + 0x771627

8        server_srv.so + 0x771e3e

9        server_srv.so + 0x750aac

10        server_srv.so + 0x60f979

11        server_srv.so + 0x94bf13

12        sdktools.ext.2.l4d2.so + 0x240e6

13        server_srv.so + 0x94bbf0

14        sdktools.ext.2.l4d2.so + 0x23ff0

15        server_srv.so + 0x768924

16        server_srv.so + 0x739e7a

17        server_srv.so + 0x73a2fa

18        server_srv.so + 0x6829f9

19        sourcemod.2.l4d2.so + 0x2c1de

20        server_srv.so + 0xc1f238

21        server_srv.so + 0x6820b0

22        engine_srv.so + 0x1ddd7f

23        engine_srv.so + 0x1def73

24        engine_srv.so + 0x15f647

25        engine_srv.so + 0x1610ab

26        engine_srv.so + 0x16b730

27        engine_srv.so + 0x16b93e

28        engine_srv.so + 0x16ba49

29        engine_srv.so + 0x1f7813

30        engine_srv.so + 0x1f48e6

31        dedicated_srv.so + 0x54f3c

32        dedicated_srv.so + 0x54fd8

33        engine_srv.so + 0x1f49cd

34        engine_srv.so + 0x245ce0

35        engine_srv.so + 0x1f57df

36        dedicated_srv.so + 0x550b0

37        dedicated_srv.so + 0x740c0

38        dedicated_srv.so + 0x740c0

39        dedicated_srv.so + 0x205b5

40        srcds_linux + 0x6f1

41        libc-2.17.so + 0x19933

42        srcds_linux + 0xc90

43        srcds_linux + 0x2f4

44        srcds_linux + 0x84c

45        ld-2.17.so + 0x14f60

46        libc-2.17.so + 0x19849

47        srcds_linux + 0x84c

48        srcds_linux + 0x86d

49        srcds_linux + 0x610

50        srcds_linux + 0x8dc

51        0xbfe64afc

52        0x5f736463

I disassembled server_srv.so:

Code:

.text:0048D1A0                                                 ; Attributes: bp-based frame

.text:0048D1A0

.text:0048D1A0                                                 ; _DWORD __cdecl CSoundPatch::ChangePitch(CSoundPatch *this, float, float)

.text:0048D1A0                                                 _ZN11CSoundPatch11ChangePitchEff proc near

.text:0048D1A0                                                                                         ; CODE XREF: CSoundControllerImp::SoundChangePitch(CSoundPatch *,float,float)+16j

.text:0048D1A0                                                                                         ; CSoundControllerImp::ProcessCommand(SoundCommand_t *)+E3p ...

.text:0048D1A0

.text:0048D1A0                                                 this            = dword ptr  8

.text:0048D1A0

.text:0048D1A0 55                                                              push    ebp

.text:0048D1A1 89 E5                                                           mov     ebp, esp

.text:0048D1A3 8B 45 08                                                        mov     eax, [ebp+this]

.text:0048D1A6 83 48 50 02                                                     or      dword ptr [eax+50h], 2

.text:0048D1AA 5D                                                              pop     ebp

.text:0048D1AB E9 B0 FC FF FF                                                  jmp     _ZN14CSoundEnvelope9SetTargetEff ; CSoundEnvelope::SetTarget(float,float)

.text:0048D1AB                                                 _ZN11CSoundPatch11ChangePitchEff endp

drop occurs due to this line:

Code:

.text:0048D1A6 83 48 50 02                                                     or      dword ptr [eax+50h], 2

Maybe know how to patch the memory location? Or maybe someone has server_srv.so early version of the game? Let's say version 2.1.4.2-2.1.4.4.

Re: L4D2 Server Crash

Best solution would be to limit the number of players that can use chainsaws and check if the current number of players equipped with chainsaw reaches the limit. If so, kill the entity.

Re: L4D2 Server Crash

You disassembled server_srv.so by IDA ?

Re: L4D2 Server Crash

Can someone understand this problem? It is still relevant (for those who have not given up chainsaws). Valve ignores this problem :(

Re: L4D2 Server Crash

Quote:

Originally Posted by Accelerator74 (Post 2427206)

The server falls after, when a lot of players have a chainsaw, and at the same time beginning to use it. The server stops responding, the var rises, falls fps and server crashes.

I know this may seem unrelated, do you use the mutation system at all, e.g. "scriptedmode.nut"
I had a similar problem while running this over a few hours OnTakeDamage would become expensive causing what you showed(server would stall var would spike alot ending in crash) but would be an event crash.

After removing any thing to do with the mutation system and DirectorOptions<- call i no longer have crashing problem due to damage or any type of perf degradation overtime

https://forums.alliedmods.net/showthread.php?p=2589396 this was a workaround

Hope it atleast helps.

Spoiler

Re: L4D2 Server Crash

No, I do not use the mutation system.

I tried to block all the sounds of the chainsaw:

Code:

#include <sourcemod>

#include <sdktools>



public OnPluginStart()

{

        AddNormalSoundHook(view_as<NormalSHook>(EventSound));

}



public Action EventSound(int clients[64], int& numClients, char sample[PLATFORM_MAX_PATH], int& entity, int& channel, float& volume, int& level, int& pitch, int& flags)

{

        if (StrContains(sample, "chainsaw", false) != -1)

                return Plugin_Handled;

        

        return Plugin_Continue;

}

It does not help.

As I noticed, the player need only start to cut (not necessarily harming anyone), and the server crashes, and not in all cases.