Error map
panic: close of closed channel Go: panic: close of closed channel (or close of nil channel)
Go · layer 4, Application & API
Centre: this error. First ring: errors it is linked with (7). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (7)
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.
Go: fatal error: concurrent map writes
Two goroutines wrote to the same map at the same time; the runtime detects it and aborts the program (not recoverable).
Go: fatal error: concurrent map read and map write
One goroutine read from a map while another wrote to it; the runtime aborts.
Go: panic: send on closed channel
A goroutine sent a value to a channel after it had been closed.
Go: panic: sync: negative WaitGroup counter
`wg.Done()` was called more times than `wg.Add()`.
Go: listen tcp :8080: bind: address already in use
The port your Go server wants is already taken by another process (or a previous instance of your app).
Go: WARNING: DATA RACE — Write at 0x00c0000 by goroutine 7: / Previous read at ... by goroutine 6
The race detector (`-race`) observed two goroutines accessing the same memory concurrently with at least one write and no synchro…
Two steps away (10)
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The request conflicts with the current state of the resource — e.g. a duplicate or an edit based on an outdated version.
java.util.ConcurrentModificationException
A collection was modified while being iterated (even in a single thread).
HTTP 412 Precondition Failed
A conditional request header (If-Match, If-Unmodified-Since) didn’t match the current state of the resource.
Go: cannot assign to struct field users["bob"].Age in map
Map values are not addressable, so you cannot modify a field of a struct stored directly in a map.
Go: panic: assignment to entry in nil map
You wrote to a map that was declared but never initialised.
Go: context canceled (rpc error: code = Canceled desc = context canceled)
The context was cancelled before the operation finished — the caller gave up, the client disconnected, or a parent was cancelled.
Go: panic: test timed out after 10m0s — running tests: TestFoo (10m0s)
`go test` killed the test binary because it exceeded the timeout (default 10 minutes), usually a hung test.
Docker: Bind for 0.0.0.0:80 failed: port is already allocated
Another container or host process already publishes that host port.
Error response from daemon: network X not found
The container or Compose project refers to a Docker network that doesn’t exist (any more).
Error response from daemon: Pool overlaps with other one on this address space
Docker tried to create a network whose subnet clashes with an existing Docker network (or a VPN/host route).
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