Re: [dtn-users] Problem DTN2 daemon

Hi Kevin,

I have been doing some digging and managed to find a fix which works on my
tested.
Assuming your configuration files are correct, you may want to try my fix
and see how you get on, you can always back-out the change if you back up
the original files.

My fix has been posted to the dtn-users forum, in response to my post on
frequent spinlock errors, but I have copied the fixes into the email below
FYI.
After making the changes, simply re-run make && make install from the oasys
directory.

1. Add the following code to the start of the function, to allow locking or
unlocking when lock_holder_name_ is NULL.

Lock.h -> is_locked_by_me():

    bool is_locked_by_me()
    {

        if (lock_holder_name_ == NULL) {
         return is_locked() && true;
        }

2. Add the following 11,000 microsecond pause, if the thread is waiting to
acquire a lock:

SpinLock.cc -> SpinLock::lock():

    while (atomic_cmpxchg32(&lock_count_, 0, 1) != 0)
    {
        Thread::spin_yield();
        // 0.011 sec sleep
        usleep(11000);

Kind Regards,
Nik

On Thu, Dec 31, 2015 at 12:17 PM, kevin prima <sir.kevinprima@gmail.com>
wrote:

> Dear all,
>
> I want to run 5 DTN node in 2 hop topology scenario with DTLSR routing,
> source and destination node connected with dtn node 1,2,and 3 but couldn't
> reach each other.
> When I try to send ping packet use dtnping, sometimes it show error like
> this in node 1, node 2, and node 3:
>
> warning: Bundle::del_ref is waiting for spin lock held by (null), which
> has reached spin limit
> STACK TRACE: 0x76f51c84 0x3eda8 0x3ed00 0x59444
>
> The impact is node 1, 2 or 3 become unavailable. What should I do to fix
> this problem ?
>
> Thanks,
> Kevin
>
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