Date: Tue, 14 May 2019 10:34:30 -0500 From: Kyle Evans <kevans@freebsd.org> To: Mark Johnston <markj@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: panic in tunstart_l2() Message-ID: <CACNAnaENuLZXG34UPq9nWx%2BbmA3ZGTtLmOj=SmwuVNXZ1iWjrQ@mail.gmail.com> In-Reply-To: <20190514151002.GE51157@raichu> References: <20190514151002.GE51157@raichu>
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On Tue, May 14, 2019 at 10:10 AM Mark Johnston <markj@freebsd.org> wrote: > > Hi, > > I hit the following panic last night on a non-INVARIANTS kernel at > r347549. The workload involves running a number of bhyve VMs with > frequent restarts, during which a tap interface is destroyed and > recreated. I'm a bit short on time to debug this today, so while I > retry with INVARIANTS on I thought I'd also report the issue in case > anyone else is seeing it. > > The panic occurred because the ifnet's softc field is NULL. Ah, foo. I'll have to re-examine the ioctl/destroy race... tun_destroy grabs the ioctl sx and kills off the if_softc, but it can not and should not do this before if_detach or else things go wrong because it's still a part of the bridge.
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