malloc: *** error for object: pointer being freed was not allocated

[chrisozenne]

I'm getting the following error when connecting to redis from my Kitura project:

myFirstProject(78932,0x700000187000) malloc: *** error for object 0x7fb2fb602d50: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

I get a response back from the request, however the server crashes after the request has been served. I think this has to do with the deinit of reds, but I am not sure how to debug.

Here's the code:

router.get("/visits", handler: {
    request, response, next in

    let redis = Redis()
    redis.connect("localhost", port: 6379, callback: { (error: NSError?) in
        if let error = error {
            Log.verbose(error.localizedDescription)
        } else {
            redis.incr("visits", by: 1, callback: { (visits: Int?, error: NSError?) in
                if let error = error {
                    Log.verbose(error.localizedDescription)
                } else {
                    if let visits = visits {
                        response.status(HttpStatusCode.OK).send("Visits: \(visits)")
                        next()
                    }
                }
            })
        }
    })
})

[Shmuel Kallner]

The issue is indeed in the deinit of the code, in particular in the call to redisFree, which closes the connection and frees the allocated memory.

I don't have a solution yet.

[Shmuel Kallner]

I now finally have solved this issue.

I removed our dependency on Hiredis and replaced it with a pure swift implementation of the REdis Serialization Protocol (RESP). This code is found in our develop branch. To use it you must:

1. Upgrade to the 05/03 drop of Swift
2. In your Package.swift file, update:
      - The minor of Kitura to13.
      - The minor of Kitura-redis to 13.
      - If present, the minor of HeliumLogger to 7.
     **Note:** You may have to update other dependencies as well, depending on what is in your Package.swift file

1. Do an rm -rf .build Kitura-Build Packages
2. Do a make run

Please note that the migration of Kitura and it's associated packages is still work in progress. Not all of the packages have been migrated yet.