Date: Wed, 04 Jul 2012 15:32:45 -0000 From: Alexey Dokuchaev <danfe@nsu.ru> To: Bernhard Schmidt <bschmidt@freebsd.org> Cc: stable@freebsd.org Subject: Re: panic with if_iwi(4) upon "netif restart" Message-ID: <20120619052810.GA40402@regency.nsu.ru> Resent-Message-ID: <201207041528.q64FSHKa081974@regency.nsu.ru> In-Reply-To: <CAAgh0_aS-7EvM1QgQzOgUF4Hqhd3w394nxw=vzB6b-e2AeUe6A@mail.gmail.com> References: <20120507035405.GA47351@regency.nsu.ru> <CAAgh0_aS-7EvM1QgQzOgUF4Hqhd3w394nxw=vzB6b-e2AeUe6A@mail.gmail.com>
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On Mon, May 07, 2012 at 08:28:50PM +0200, Bernhard Schmidt wrote: > On Mon, May 7, 2012 at 5:54 AM, Alexey Dokuchaev <danfe@nsu.ru> wrote: > > Weird panic occurs to me here with iwi(4) based laptop when trying to hook > > up to WPA-protected network with "service netif restart". Kernel and > > userland are not strictly in sync, with the latter lagging behind couple > > of months, but presumably this fact should not matter on stable branch. > > does "ps" in kgdb reveal multiple instances of wpa_supplicant running? > If so, this seems to be the well known devd+netif+supplicant+newstate > race/missing refcount. > > Wanna try attached patch? Bernhard, Sorry it took so long to get back. With your patch applied, I haven't seen this panic for a while, however, double instances of wpa_supplicant still persist. So I think you can commit it, but underlying race remains to be fixed. ./danfe
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