Server crash when destroyvehicle
#1

Hi,

I find hidden bug. When I destroy vehicle in OnVehicleDeath there is chance to crash a server.

Code:
Code:
hook OnVehicleDeath(vehicleid, killerid){
	Debug(DBG_CORE, "Vehicle/Core.pwn","OnVehicleDeath(%d,%d)",vehicleid,killerid);
	foreach(new car : Vehicles){
		if(Vehicles[car][ID] == vehicleid){
			printf("%d == %d", Vehicles[car][ID], vehicleid);
			DestroyVehicle(vehicleid);
			veh_Locked[vehicleid] = INVALID_PLAYER_ID;
			defer ReCreateCar(car);
		}
	}
}

timer ReCreateCar[2500](car)
{ 
	new type = Vehicles[car][Type];
	Vehicles[type][Color][0] = random(255);
	Vehicles[type][Color][1] = random(255);
	new rand = random(VehicleCategorySize[type]);
	printf("ReCreateCar(%d), type = %d, rand = %d", car, type, rand);
	Vehicles[car][ID] = CreateVehicle(VehicleCategory[type][rand], Vehicles[car][Pos][0], Vehicles[car][Pos][1], Vehicles[car][Pos][2], Vehicles[car][Pos][3], Vehicles[car][Color][0], Vehicles[car][Color][1], 120);
	printf("ReCreateCar(%d), type = %d, rand = %d", car, type, rand);
	veh_Traveled[Vehicles[car][ID]] = randomEx(0,200000);
	if(!Vehicle_IsManual(Vehicles[car][ID])){
		SetVehicleFuel(Vehicles[car][ID], RandomFloat(3.0, GetModelMaxFuel(VehicleCategory[type][rand]), 2) );
		print("SetVehicleParams");
		SetVehicleParamsEx(Vehicles[car][ID],0,0,0,0,0,0,0);
	}
}
LOG:
Code:
[20:47:59] Vehicle/Core.pwn -> OnVehicleDeath(7,0)
[20:47:59] 7 == 7
[20:48:02] ReCreateCar(6), type = 8, rand = 23
[20:48:02] ReCreateCar(6), type = 8, rand = 23
[20:48:02] SetVehicleParams
[20:48:12] Vehicle/Core.pwn -> OnVehicleDeath(7,0)
[20:48:12] 7 == 7
[20:48:15] ReCreateCar(6), type = 8, rand = 15
[20:48:15] ReCreateCar(6), type = 8, rand = 15
[20:48:15] SetVehicleParams
[20:48:24] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:48:24] 7 == 7
[20:48:27] ReCreateCar(6), type = 8, rand = 4
[20:48:27] ReCreateCar(6), type = 8, rand = 4
[20:48:27] SetVehicleParams
[20:48:32] Vehicle/Core.pwn -> OnVehicleDeath(7,0)
[20:48:32] 7 == 7
[20:48:35] ReCreateCar(6), type = 8, rand = 3
[20:48:35] ReCreateCar(6), type = 8, rand = 3
[20:48:35] SetVehicleParams
[20:48:47] Vehicle/Core.pwn -> OnVehicleDeath(7,0)
[20:48:47] 7 == 7
[20:48:50] ReCreateCar(6), type = 8, rand = 18
[20:48:50] ReCreateCar(6), type = 8, rand = 18
[20:48:50] SetVehicleParams
[20:49:13] Vehicle/Core.pwn -> OnVehicleDeath(7,0)
[20:49:13] 7 == 7
[20:49:16] ReCreateCar(6), type = 8, rand = 18
[20:49:16] ReCreateCar(6), type = 8, rand = 18
[20:49:16] SetVehicleParams
[20:49:30] Vehicle/Core.pwn -> OnVehicleDeath(7,0)
[20:49:30] 7 == 7
[20:49:33] ReCreateCar(6), type = 8, rand = 17
[20:49:33] ReCreateCar(6), type = 8, rand = 17
[20:49:33] SetVehicleParams
[20:49:46] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:49:46] 7 == 7
[20:49:49] ReCreateCar(6), type = 8, rand = 32
[20:49:49] ReCreateCar(6), type = 8, rand = 32
[20:49:49] SetVehicleParams
[20:50:02] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:50:02] 7 == 7
[20:50:05] ReCreateCar(6), type = 8, rand = 24
[20:50:05] ReCreateCar(6), type = 8, rand = 24
[20:50:05] SetVehicleParams
[20:50:18] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:50:18] 7 == 7
[20:50:21] ReCreateCar(6), type = 8, rand = 28
[20:50:21] ReCreateCar(6), type = 8, rand = 28
[20:50:21] SetVehicleParams
[20:50:34] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:50:34] 7 == 7
[20:50:37] ReCreateCar(6), type = 8, rand = 13
[20:50:37] ReCreateCar(6), type = 8, rand = 13
[20:50:37] SetVehicleParams
[20:50:52] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:50:52] 7 == 7
[20:50:55] ReCreateCar(6), type = 8, rand = 26
[20:50:55] ReCreateCar(6), type = 8, rand = 26
[20:50:55] SetVehicleParams
[20:51:10] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:51:10] 7 == 7
[20:51:13] ReCreateCar(6), type = 8, rand = 2
[20:51:13] ReCreateCar(6), type = 8, rand = 2
[20:51:13] SetVehicleParams
[20:51:28] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:51:28] 7 == 7
[20:51:31] ReCreateCar(6), type = 8, rand = 31
[20:51:31] ReCreateCar(6), type = 8, rand = 31
[20:51:31] SetVehicleParams
[20:51:38] Vehicle/Core.pwn -> OnVehicleDeath(21,0)
[20:51:38] 21 == 21
[20:51:41] ReCreateCar(20), type = 6, rand = 8
[20:51:41] ReCreateCar(20), type = 6, rand = 8
[20:51:41] SetVehicleParams
[20:51:55] Vehicle/Core.pwn -> OnVehicleDeath(7,4)
[20:51:55] 7 == 7
[20:51:58] [debug] Server crashed due to an unknown error
[20:51:58] [debug] Native backtrace:
[20:51:58] [debug] #0 f7407e8b in _ZN10StackTraceC1EPv () from plugins/crashdetect.so
[20:51:58] [debug] #1 f7400bcf in _ZN11CrashDetect20PrintNativeBacktraceERSoPv () from plugins/crashdetect.so
[20:51:58] [debug] #2 f7401dbc in _ZN11CrashDetect20PrintNativeBacktraceEPv () from plugins/crashdetect.so
[20:51:58] [debug] #3 f7402226 in _ZN11CrashDetect11OnExceptionEPv () from plugins/crashdetect.so
[20:51:58] [debug] #4 f7407adc in ?? () from plugins/crashdetect.so
[20:51:58] [debug] #5 f76e8410 in ?? ()
[20:51:58] [debug] #6 0809568a in ?? () from ./7777svr
[20:51:58] [debug] #7 080957cd in ?? () from ./7777svr
[20:51:58] [debug] #8 f63975b4 in ?? () from plugins/streamer.so
[20:51:58] [debug] #9 080ebba0 in ?? () from ./7777svr
[20:51:58] [debug] #10 080af03c in ?? () from ./7777svr
[20:51:58] [debug] #11 080aa13a in ?? () from ./7777svr
[20:51:58] [debug] #12 f7442e46 in __libc_start_main () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
[20:51:58] [debug] #13 0804b4e1 in ?? () from ./7777svr
Can someone confirm this bug? We destroy about 50 vehicles before crash.

Cheers
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#2

confirm
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#3

Also, if we try to disable the vehicle objective under OnVehicleDeath with SetVehicleParamsEx, it will not disappear until respawn.
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#4

is there something with restart?

Quote:

[20:51:55] 7 == 7
[20:51:58] [debug] Server crashed due to an unknown error

3 seconds after
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#5

Confirmed (been over a year now... I know)
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#6

This bug is still affecting my server very badly version 0.3.7-R2

is there any fix for it
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#7

Quote:
Originally Posted by NeXTGoD
View Post
This bug is still affecting my server very badly version 0.3.7-R2

is there any fix for it
Don't destroy vehicles under OnVehicleDeath??
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#8

Quote:
Originally Posted by RogueDrifter
View Post
Don't destroy vehicles under OnVehicleDeath??
Nope, the public is empty
Reply
#9

Quote:
Originally Posted by NeXTGoD
View Post
Nope, the public is empty
Show server logs using crashdetect.
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#10

Quote:
Originally Posted by RogueDrifter
View Post
Show server logs using crashdetect.
Code:
[03/09/2018 16:05:40] OnPlayerSpawn(1)
[03/09/2018 16:05:40] CountdownPlayer(1,3)
[03/09/2018 16:05:43] OnVehicleDeath(4)
[03/09/2018 16:05:43] CountdownPlayer(1,2)
[03/09/2018 16:05:43] [debug] Server crashed due to an unknown error
[03/09/2018 16:05:44] [debug] Native backtrace:
[03/09/2018 16:05:44] [debug] #0 b7355ed6 in _Z13GetStackTraceRSt6vectorI10StackFrameSaIS0_EEPv () from plugins/crashdetect.so
[03/09/2018 16:05:44] [debug] #1 b734e210 in _ZN18CrashDetectHandler20PrintNativeBacktraceERSoRKN2os7ContextE () from plugins/crashdetect.so
[03/09/2018 16:05:44] [debug] #2 b734f05c in _ZN18CrashDetectHandler20PrintNativeBacktraceERKN2os7ContextE () from plugins/crashdetect.so
[03/09/2018 16:05:44] [debug] #3 b734fbb6 in _ZN18CrashDetectHandler7OnCrashERKN2os7ContextE () from plugins/crashdetect.so
[03/09/2018 16:05:44] [debug] #4 b73555c2 in ?? () from plugins/crashdetect.so
[03/09/2018 16:05:44] [debug] #5 b76fe600 in __kernel_rt_sigreturn () from linux-gate.so.1
[03/09/2018 16:05:44] [debug] #6 0814b4bc in ?? () from ./samp8888_6551
[03/09/2018 16:05:44] [debug] #7 0814cccf in ?? () from ./samp8888_6551
[03/09/2018 16:05:44] [debug] #8 080af078 in ?? () from ./samp8888_6551
[03/09/2018 16:05:44] [debug] #9 080aa13a in ?? () from ./samp8888_6551
[03/09/2018 16:05:44] [debug] #10 b7396723 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
[03/09/2018 16:05:44] [debug] #11 0804b4e1 in ?? () from ./samp8888_6551
[03/09/2018 16:05:44] [debug] Registers:
[03/09/2018 16:05:44] [debug] EAX: 447a0000 EBX: 0a2ff5b0 ECX: 00000000 EDX: c511ac1b
[03/09/2018 16:05:44] [debug] ESI: 00000004 EDI: 0a2ff67b EBP: bfcc5028 ESP: bfcc5000
[03/09/2018 16:05:44] [debug] EIP: 0814b4bc EFLAGS: 00010246
[03/09/2018 16:05:44] [debug] Stack:
[03/09/2018 16:05:44] [debug] ESP+00000000: 0a2ff5bc 00000000 00000040 00000000
[03/09/2018 16:05:44] [debug] ESP+00000020: 00000002 0a37cf18 bfcc5048 0814cccf
[03/09/2018 16:05:44] [debug] ESP+00000040: 00000000 08159c53 bfcc5078 080af078
[03/09/2018 16:05:44] [debug] ESP+00000060: 081a18b4 00000000 00000000 004c4b40
[03/09/2018 16:05:44] [debug] ESP+00000080: 0a168e78 08159c53 00000006 08159c6d
[03/09/2018 16:05:44] [debug] ESP+000000a0: bfcc50bc b76646d6 b76c8000 b76302f3
[03/09/2018 16:05:44] [debug] ESP+000000c0: 00010000 000022b8 00000032 0163044b
[03/09/2018 16:05:44] [debug] ESP+000000e0: b76c8000 b76c8000 b76c95a0 b75d60a9
[03/09/2018 16:05:44] [debug] ESP+00000100: 080494b0 b76c9784 b74edd64 081a1880
[03/09/2018 16:05:44] [debug] ESP+00000120: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+00000140: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+00000160: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+00000180: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+000001a0: b74ed3a4 b7720000 081505cb b74ed000
[03/09/2018 16:05:44] [debug] ESP+000001c0: 00000001 bfcc5254 bfcc525c b770de9a
[03/09/2018 16:05:44] [debug] ESP+000001e0: 080494b0 b74ed000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+00000200: 00000000 00000000 00000001 0804b4c0
[03/09/2018 16:05:44] [debug] ESP+00000220: 00000001 0804b4c0 00000000 0804b4e1
[03/09/2018 16:05:44] [debug] ESP+00000240: 081505b0 b770e350 bfcc524c 0000001c
[03/09/2018 16:05:44] [debug] ESP+00000260: bfcc5eb1 bfcc5ec1 bfcc5ee6 bfcc5ef0
[03/09/2018 16:05:44] [debug] ESP+00000280: bfcc5f62 bfcc5f6f bfcc5fa6 bfcc5fc5
[03/09/2018 16:05:44] [debug] ESP+000002a0: 00000021 b76fe000 00000010 bfebfbff
[03/09/2018 16:05:44] [debug] ESP+000002c0: 00000003 08048034 00000004 00000020
[03/09/2018 16:05:44] [debug] ESP+000002e0: 00000008 00000000 00000009 0804b4c0
[03/09/2018 16:05:44] [debug] ESP+00000300: 0000000d 000003e8 0000000e 000003e8
[03/09/2018 16:05:44] [debug] ESP+00000320: 0000001f bfcc5fe8 0000000f bfcc534b
[03/09/2018 16:05:44] [debug] ESP+00000340: c40c55b9 d0b79f9a 6964cb19 00363836
[03/09/2018 16:05:44] [debug] ESP+00000360: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+00000380: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+000003a0: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+000003c0: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] ESP+000003e0: 00000000 00000000 00000000 00000000
[03/09/2018 16:05:44] [debug] Loaded modules:
[03/09/2018 16:05:44] [debug] 00000000 - 00187d1f samp8888_6551
[03/09/2018 16:05:44] [debug] b7700000 - b7700704 linux-gate.so.1
[03/09/2018 16:05:44] [debug] b76e8000 - b76ea81f /lib/i386-linux-gnu/libdl.so.2
[03/09/2018 16:05:44] [debug] b76cd000 - b76e72f3 /lib/i386-linux-gnu/libpthread.so.0
[03/09/2018 16:05:44] [debug] b7553000 - b76d63b3 /usr/lib/i386-linux-gnu/libstdc++.so.6
[03/09/2018 16:05:44] [debug] b750e000 - b7551ab7 /lib/i386-linux-gnu/libm.so.6
[03/09/2018 16:05:44] [debug] b74f1000 - b750d3c4 /lib/i386-linux-gnu/libgcc_s.so.1
[03/09/2018 16:05:44] [debug] b737d000 - b74f8ddb /lib/i386-linux-gnu/libc.so.6
[03/09/2018 16:05:44] [debug] b76ff000 - b771fd6c /lib/ld-linux.so.2
[03/09/2018 16:05:44] [debug] b7337000 - b7378e08 plugins/crashdetect.so
[03/09/2018 16:05:44] [debug] b7272000 - b7336bcf plugins/streamer.so
[03/09/2018 16:05:44] [debug] b76f2000 - b76f9093 /lib/i386-linux-gnu/librt.so.1
[03/09/2018 16:05:44] [debug] b703b000 - b7278854 plugins/YSF.so
[03/09/2018 16:05:44] [debug] b702e000 - b7039790 plugins/sscanf.so
[03/09/2018 16:05:44] [debug] b7028000 - b702b5d8 plugins/MapAndreas.so
[03/09/2018 16:05:44] [debug] b6fe5000 - b6ff03ef /lib/i386-linux-gnu/libnss_files.so.2
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#11

Quote:
Originally Posted by RogueDrifter
View Post
Show server logs using crashdetect.
UPDATE: Day 4 has passed without any crashes, so I think I've fixed it with ( vehicleid != INVALID_VEHICLE_ID ) check before destroying the vehicle.
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#12

This is interesting, this is a few years ago but I ran a script that did this with no issue but another option here to stay clear of this issue is to destroy the vehicle in "OnVehicleSpawn" with a variable to allow the first spawn.
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#13

Quote:
Originally Posted by ashleymeah
View Post
This is interesting, this is a few years ago but I ran a script that did this with no issue but another option here to stay clear of this issue is to destroy the vehicle in "OnVehicleSpawn" with a variable to allow the first spawn.
No, the solution is to check for the invalid vehicle before destroying it obviously...
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#14

The original error shows a vehicle being destroyed inside a foreach loop, in other words, removing an item from an iterator inside a loop, which is known with YSI to cause problems.

Although maybe the error could be a result of a SA-MP bug, but first a repro should be made without any other includes.
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#15

Or you could set a flag for that vehicle and destroy it under OnVehicleSpawn in case the flag was set.
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