From the Go Language Spec: For a channel c, the built-in function close(c) records that no more values will be sent on the channel. It is an error if c is a receive-only channel. Sending to or closing a closed channel causes a run-time panic. Closing the nil channel also causes a run-time panic. After … Read more
‘?’ means that the information about this stack entry is probably not reliable. The stack output mechanism (see the implementation of dump_trace() function) was unable to prove that the address it has found is a valid return address in the call stack. ‘?’ itself is output by printk_stack_address(). The stack entry may be valid or … Read more
if the full message is: kernel panic – not syncing: Attempted to kill inint ! PId: 1, comm: init not tainted 2.6.32.-279-5.2.e16.x86_64 #1 then you should have disabled selinux and after that you have rebooted the system. The easier way is to use a live OS and re-enable it vim /etc/selinux/config … SELINUX=enforcing … Second … Read more
It’s just an ordinary backtrace, those functions are called in reverse order (first one called was called by the previous one and so on): unwind_backtrace+0x0/0xf8 warn_slowpath_common+0x50/0x60 warn_slowpath_null+0x1c/0x24 ocal_bh_enable_ip+0xa0/0xac bdi_register+0xec/0x150 The bdi_register+0xec/0x150 is the symbol + the offset/length there’s more information about that in Understanding a Kernel Oops and how you can debug a kernel oops. … Read more
You should assume that a panic will be immediately fatal, for the entire program, or at the very least for the current goroutine. Ask yourself “when this happens, should the application immediately crash?” If yes, use a panic; otherwise, use an error.
In a deferred function you can alter the returned parameters, but you can’t return a new set. So a simple change to what you have will make it work. There is another problem with what you wrote, namely that the you’ve paniced with a string but are expecting an error in your type assertion. Here … Read more
Like @Volker mentioned above, and what was posted as a comment, we can use the runtime/debug package. package main import ( “fmt” “runtime/debug” ) func main() { defer func() { if r := recover(); r != nil { fmt.Println(“stacktrace from panic: \n” + string(debug.Stack())) } }() var mySlice []int j := mySlice[0] fmt.Printf(“Hello, playground %d”, … Read more