Re: Memory (skb) leak in kernel 4.8-rc2

[Frederic Dalleau]

Hi Marcel, Johan,

> > > I am unable to unload module bluetooth to verify that the second
> > > leak is not a false positive; however, the one in btusb is a real
> > > memory leak.

There was a bugzilla last week with that backtrace: 
https://bugzilla.kernel.org/show_bug.cgi?id=120691

At the time, I was thinking that the leak could originate from one of 
the req_complete_skb callback, but which one?

And today that the issue has popped again, I found that 
hci_req_sync_complete references the skb in hdev->req_skb. It is called 
(via hci_req_run_skb) from either __hci_cmd_sync_ev which will pass the 
skb to the caller, or __hci_req_sync which leaks.

I have a patch on the grill.

Best Regards,
Frédéric