Date: Sun, 28 Jan 2018 19:44:01 -0800 From: Cy Schubert <Cy.Schubert@cschubert.com> To: Warner Losh <imp@bsdimp.com> Cc: Cy Schubert <Cy.Schubert@cschubert.com>, Allan Jude <allanjude@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Panic on shutdown @r328436: "Unholding 6 with cnt = -559038242" Message-ID: <201801290344.w0T3i19l071991@slippy.cwsent.com> In-Reply-To: Message from Warner Losh <imp@bsdimp.com> of "Sun, 28 Jan 2018 20:18:59 -0700." <CANCZdfpgo7=O%2BNvQH_Vh56U1sSd92_3TmNGDiSF%2BxMXzQQNsnA@mail.gmail.com>
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In message <CANCZdfpgo7=O+NvQH_Vh56U1sSd92_3TmNGDiSF+xMXzQQNsnA@mail.gma il.com> , Warner Losh writes: > --94eb2c0425900a5b5c0563e1b5b8 > Content-Type: text/plain; charset="UTF-8" > Content-Transfer-Encoding: quoted-printable > > On Sun, Jan 28, 2018 at 7:38 PM, Cy Schubert <Cy.Schubert@cschubert.com> > wrote: > > > In message <2effa324-c428-6135-371b-acb00c803d29@freebsd.org>, Allan > > Jude write > > s: > > > On 2018-01-28 16:28, Warner Losh wrote: > > > > On Sun, Jan 28, 2018 at 2:22 PM, thomas masper < > > thomas.masper@gmail.com> > > > > wrote: > > > > > > > >> Hi, > > > >> similar panic happen to me when extracting a pendrive from laptop US= > B > > port > > > >> (I tried 3 different pendrive). > > > >> No issue if I reboot or shutdown. I don't know if those two issues a= > re > > > >> related. > > > >> > > > > > > > > Do you have a reproducible test case? Ideally, it would be 'insert an= > d > > > > remove usb thumb drive' but maybe there's more steps between insert a= > nd > > > > removal. > > > > > > > > Warner > > > > > > > > > > > > > > > >> panic: Releasing 6 with cnt =3D -559038242 > > > > Converting this to hex we get DEADC0DE. > > > vm/uma_dbg.c:static const uint32_t uma_junk =3D 0xdeadc0de; > > Use after free it is then... Yes, INVARIANTS. Learned that when I was chasing an ipfilter use after free. -- Cheers, Cy Schubert <Cy.Schubert@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org The need of the many outweighs the greed of the few.
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