7 Days To Die: Caught fatal signal – signo:6 code:-6 errno:0

Signal 6 (SIGABRT) = SIGABRT is commonly used by libc and other libraries to abort the program in case of critical errors. For example, glibc sends a SIGABRT in case of a detected double-free or other heap corruptions. That’s usually a bug in the game server and/or the mod.

Signo 6: Fatal Warning Received Code: -6 Fixing Errno 0: An Explanation and Analysis

As a developer or server administrator, you may have run into the “Caught fatal signal – signo: 6 code: -6 errno: 0” error message. A process or thread has been terminated because of a fatal signal, as indicated by this error message. In this piece, I’ll explain what’s going wrong and how to fix it.

Knowing What Went Wrong

By sending a fatal signal to a process or thread, the operating system indicates that the process or thread has encountered an error that cannot be fixed and must be terminated immediately. The SIGABRT signal caused the process or thread to terminate, as indicated by the “Caught fatal signal – signo: 6 code: -6 errno: 0” error message.

An error has occurred, and the process or thread must be terminated, so it sends the SIGABRT signal to itself or to other processes or threads. When the C library detects a critical error condition, such as a buffer overflow, memory corruption, or other programming errors, it will typically send this signal.

There are three pieces of data in the “Caught fatal signal – signo: 6 code: -6 errno: 0” error message:

signal 6: The signal number that resulted in the termination of the process or thread. For the purposes of this article, “signo 6” stands for the SIGABRT signal.
Code -6 indicates the exit status of the terminated process or thread. Getting a SIGABRT signal causes the process or thread to exit, as indicated by exit code -6.
The error condition that terminated the process or thread is denoted by the error number errno: 0. If errno is 0, then the signal was received without any problems.
Roots of the Problem

There are a number of possible origins of the “Caught fatal signal – signo: 6 code: -6 errno: 0” message.

Null pointer dereferencing, buffer overflow, and other programming mistakes are common causes of this error. The C library may send a SIGABRT signal to the process or thread if an error occurs.

Also, hardware failures like bad RAM or an old hard drive can trigger this error. Because of these problems, the SIGABRT signal might be sent if memory becomes corrupted.

Exhaustion of system resources like file descriptors, network sockets, or memory can trigger a SIGABRT signal from the C library, which will terminate the offending process or thread.

A Solution to the Problem

In order to resolve the error “Caught fatal signal – signo: 6 code: -6 errno: 0,” it is necessary to determine what caused the error and then take action to resolve the issue. Follow these instructions to correct this issue:

If you suspect programming errors are to blame, debugging the code will help you find and fix the problem. Fix any bugs or programming mistakes by tracing them back to their original source using a debugger.

You should examine your computer’s memory modules and hard drives for signs of failure to determine if the error is caused by hardware failure. To correct the issue, please replace any faulty parts.

If the error is caused by low system resources, like memory or network sockets, try giving the process or thread more of what it needs.

Example log trace:

2022-12-23T04:52:42 124792.099 INF NET: LiteNetLib: Client disconnect from: 162.234.165.54:64555 (DisconnectPeerCalled)
2022-12-23T04:52:42 124792.100 INF 9029096 VehicleManager RemoveTrackedVehicle [type=EntityVGyroCopter, name=vehicleGyrocop⏎
  ter, id=65281], Unloaded
2022-12-23T04:52:42 124792.109 INF 9029096 VehicleManager RemoveTrackedVehicle [type=EntityVGyroCopter, name=vehicleUH60, i⏎
  d=64930], Unloaded
2022-12-23T04:52:42 124792.109 INF 9029096 VehicleManager RemoveTrackedVehicle [type=EntityMotorcycle, name=vehicleRat, id=⏎
  65322], Unloaded
2022-12-23T04:52:42 124792.110 INF NET: LiteNetLib: Received package from an unknown client: 162.234.165.54:64555
2022-12-23T04:52:42 124792.110 INF NET: LiteNetLib: Received package from an unknown client: 162.234.165.54:64555
2022-12-23T04:52:42 124792.110 INF NET: LiteNetLib: Received package from an unknown client: 162.234.165.54:64555
2022-12-23T04:52:42 124792.111 INF NET: LiteNetLib: Received package from an unknown client: 162.234.165.54:64555
2022-12-23T04:52:49 124799.769 INF Clearing all pools
2022-12-23T04:53:02 124812.812 INF Time: 2051.49m FPS: 275.46 Heap: 6516.1MB Max: 7246.2MB Chunks: 391 CGO: 29 Ply: 0 Zom: ⏎
  5 Ent: 8 (922) Items: 9 CO: 1 RSS: 14005.8MB
mmap(PROT_NONE) failed
Caught fatal signal - signo:6 code:-6 errno:0 addr:0x5a400027208
Obtained 28 stack frames.
#0  0x007f20103ed420 in (Unknown)
#1  0x007f201022a00b in (Unknown)
#2  0x007f2010209859 in (Unknown)
#3  0x007f1f5fabedf1 in (Unknown)
#4  0x007f1f5fabee5e in (Unknown)
#5  0x007f1f5fac1fc4 in (Unknown)
#6  0x007f1f5fac222d in (Unknown)
#7  0x007f1f5fac331e in (Unknown)
#8  0x007f1f5fac61af in (Unknown)
#9  0x007f1f5fac6389 in (Unknown)
#10 0x007f1f5fa99400 in (Unknown)
#11 0x007f1f5fa4f9e8 in (Unknown)
#12 0x007f1f5fa62a76 in (Unknown)
#13 0x000000401c9516 in (wrapper managed-to-native) string:FastAllocateString (int)
#14 0x000000406b08c8 in ControlPanel:ParseRequest (string,int,System.Net.HttpListenerRequest)
#15 0x000000406adb2c in ControlPanel:SendResponse (System.Net.HttpListenerRequest)
#16 0x000000405c2e37 in System.Threading.QueueUserWorkItemCallback:WaitCallback_Context (object)
#17 0x000000405609d4 in System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCa⏎
  llback,object,bool)
#18 0x00000040590efc in System.Threading._ThreadPoolWaitCallback:PerformWaitCallback ()
#19 0x007f1f5f8dcbe5 in (Unknown)
#20 0x007f1f5fa4ca10 in (Unknown)
#21 0x007f1f5fa68e01 in (Unknown)
#22 0x007f1f5f9e43da in (Unknown)
#23 0x007f1f5fa66cfe in (Unknown)
#24 0x007f1f5fac8d2f in (Unknown)
#25 0x007f1f5fabd865 in (Unknown)
#26 0x007f20103e1609 in (Unknown)
#27 0x007f2010306133 in (Unknown)