On 01/08/2021 16:36, Alexander V. Chernikov wrote:
On 10 Jul 2021, at 10:07, Andriy Gapon <a...@freebsd.org> wrote:
On 09/07/2021 00:02, Alexander V. Chernikov wrote:
Hi Andriy,
Could you by any chance provide a bit more info on the system networking
configuration and the steps leading to panic?
No chance for a coredump?
destroy_nhgrp() suggests that there was a multipath route (default?) that was
deleted.
nhops are created with UMA_ALIGN_PTR, so I suspect there is a garbage inside
nhgrp pointer..
I've just reproduced the problem and got a crash dump.
The new panic is a little bit different, but I think that it confirms your
analysis.
Also, you are right about the multipath route, although its creation was not
intentional.
Should be fixed by
https://cgit.freebsd.org/src/commit/?id=054948bd81bb9e4e32449cf351b62e501b8831ff
.
I have to report that, unfortunately, as of main
bb958dcf3d8af3a033dacbf8133681c9b0c73b2f I can still reproduce the same panic
using the same steps.
To be clear, as I reported two similar but still distinct panics, it's the first
panic, "Misaligned access from kernel space!".
I should also add that the commit message does not really match my scenario.
In my case routes do not change quite fast. I have generous pauses between
starting and stopping ppp.
I have a feeling that there must something more deterministic that leads to the
crash.
--
Andriy Gapon
