Re: network crash in nhop_free
- Reply: Andriy Gapon : "Re: network crash in nhop_free"
- In reply to: Alexander V. Chernikov: "Re: network crash in nhop_free"
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Date: Mon, 30 Aug 2021 07:28:55 UTC
On 01/08/2021 16:36, Alexander V. Chernikov wrote: > > >> On 10 Jul 2021, at 10:07, Andriy Gapon <avg@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