Error map

invalid memory address or nil pointer dereference Go: panic: runtime error: invalid memory address or nil pointer dereference

Go · layer 4, Application & API

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1 · On your device 2 · Network 4 · Application & API 6 · Platform & cloud
invalid memory address or nil pointer dereference — Go: panic: runtime error: invalid memory address or nil pointer dereference (Go)invalid mem…SIGSEGV — Segmentation fault (core dumped) (Linux)SIGSEGVall goroutines are asleep - deadlock — Go: fatal error: all goroutines are asleep - deadlock! (Go)all goroutines are …declared and not used — Go: declared and not used: x / "fmt" imported and not used (Go)declared and not us…CrashLoopBackOff — Kubernetes: CrashLoopBackOff (Kubernetes)CrashLoopBackOffRangeError — RangeError: Maximum call stack size exceeded (JavaScript)RangeErrorOOM killer — Killed / Out of memory: Killed process (Linux OOM killer) (Linux)OOM killer409 — HTTP 409 Conflict (HTTP)409ConcurrentModificationException — java.util.ConcurrentModificationException (Java)ConcurrentModificat…412 — HTTP 412 Precondition Failed (HTTP)412TypeError: not a function — TypeError: x is not a function (JavaScript)TypeError: not a fu…ImportError — ImportError: cannot import name 'x' from 'y' (Python)ImportErrornot a constructor — TypeError: x is not a constructor (JavaScript)not a constructor

Directly related (3)

SIGSEGVLinux

Segmentation fault (core dumped)

A program accessed memory it wasn’t allowed to, and the kernel killed it with SIGSEGV (exit code 139).

all goroutines are asleep - deadlockGo

Go: fatal error: all goroutines are asleep - deadlock!

Every goroutine is blocked waiting (on a channel, mutex or WaitGroup), so the program can never continue.

declared and not usedGo

Go: declared and not used: x / "fmt" imported and not used

Go refuses to compile code with unused local variables or unused imports.

Two steps away (9)

CrashLoopBackOffKubernetes

Kubernetes: CrashLoopBackOff

The container starts, crashes (or exits), and Kubernetes keeps restarting it with increasing back-off delays.

RangeErrorJavaScript

RangeError: Maximum call stack size exceeded

A function called itself (directly or indirectly) too many times — usually infinite recursion.

OOM killerLinux

Killed / Out of memory: Killed process (Linux OOM killer)

The kernel ran out of memory and killed a process to recover — the program just prints “Killed” (exit code 137).

409HTTP

HTTP 409 Conflict

The request conflicts with the current state of the resource — e.g. a duplicate or an edit based on an outdated version.

ConcurrentModificationExceptionJava

java.util.ConcurrentModificationException

A collection was modified while being iterated (even in a single thread).

412HTTP

HTTP 412 Precondition Failed

A conditional request header (If-Match, If-Unmodified-Since) didn’t match the current state of the resource.

TypeError: not a functionJavaScript

TypeError: x is not a function

You called something as a function, but its value is not a function (it’s undefined, a string, an object…).

ImportErrorPython

ImportError: cannot import name 'x' from 'y'

The module was found, but the name you’re importing from it doesn’t exist — usually a version change or a circular import.

not a constructorJavaScript

TypeError: x is not a constructor

new was used with something that isn’t a class/constructor — usually a wrong import.

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