On Thu, 2017-03-02 at 07:59 +0200, Noa Osherovich wrote:
> On 3/1/2017 6:52 PM, Bart Van Assche wrote:
>
> > On Wed, 2017-03-01 at 16:30 +0200, Noa Osherovich wrote:
> > > REGS: c0000001ce7077e0 TRAP: 0300 Not tainted (2.6.32-642.el6.ppc64)
> >
> > Hello Noa,
> >
> > I agree with Christoph and Sagi that your analysis doesn't match the upstream
> > code. I think the above information means that you are using RHEL 6.8?
>
> Yes, as well as other older kernel, as I wrote to Christoph. We'll adapt the code.
It might be good to know that I ran into a similar issue earlier today with kernel
v4.10 by using the IB/CM and by destroying the QP before the CM ID. In other words,
the behavior you observed is not necessarily a bug in the polling code but may also
be a use-after-free of the memory that was allocated for the QP WR and/or WC buffers.
With the new polling API such errors are much more serious than before because the
new polling API jumps to an address retrieved from a WC entry.
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