A jpeg parser, running on a surveillance camera, which crashed every time the company’s CEO came into the room. 100% reproducible error. I kid you not! This is why: For you who doesn’t know much about JPEG compression – the image is kind of broken down into a matrix of small blocks which then are … Read more
Had this problem also and it seems to be related to versions of jupyter and ipdb. Solution is to use this instead of the ipdb library set_trace call: from IPython.core.debugger import Tracer Tracer()() #this one triggers the debugger Source: http://devmartin.com/blog/2014/10/trigger-ipdb-within-ipython-notebook/ Annotated screenshot:
The debugger (edebug) is pretty straight forward to use. Go to the definition of the function, and type M-x edebug-defun. The next time it is called, you’ll be able to step through the code as with every other debugger. Type ? for the list of keybindings, or check out the documentation for edebug.
In fact, Fiddler Classic does not need to be installed: Download Fiddler Classic setup (ie. FiddlerSetup.exe) Open it with your Archive Manager (ie. 7-Zip) Open $PLUGINSDIR folder Open the contained FiddlerSetup.exe (yes again) in your Archive Manager Extract the files in a folder Run Fiddler.exe For Fiddler Everywhere, it is almost the same Download Fiddler … Read more
You have to enable debugging in two places. On PGAdmin and on the database itself. That article you referenced does a wonderful job explaining it but there were some nuances. PGAdmin When updating your postgresql.conf file to load the debugging library, I was running PGAdmin on Windows so the file was here: C:\Program Files\PostgreSQL\9.4\data\postgresql.conf And … 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
If you install the latest software and library, it is super easy to debug: As you can see from the screenshot, just click “debug test” and debug it!
Do note that on newer Apache versions the RewriteLog and RewriteLogLevel have been removed, and in fact will now trigger an error when trying to start Apache (at least on my XAMPP installation with Apache 2.4.2): AH00526: Syntax error on line xx of path/to/config/file.conf: Invalid command ‘RewriteLog’, perhaps misspelled or defined by a module not … Read more
When you are stopped at a breakpoint in GHCi, you can access anything that’s in scope. Let’s say you have a function like this: foo :: Int -> Int foo x = g (x + 2) where g y = x^y You can set a breakpoint on foo and try calling it: > :break foo … Read more
The basic steps of tracing for function calls are on a non-live node: > dbg:start(). % start dbg > dbg:tracer(). % start a simple tracer process > dbg:tp(Module, Function, Arity, []). % specify MFA you are interested in > dbg:p(all, c). % trace calls (c) of that MFA for all processes. … trace here > … Read more