Date: Mon, 4 Mar 2019 20:03:31 -0500 From: Nick Rogers <ncrogers@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: FreeBSD STABLE <freebsd-stable@freebsd.org> Subject: Re: 12.0-RELEASE zfs/vnode deadlock issue Message-ID: <CAKOb=YasppxTsEiow1rj0W%2BKRm6kWriD98yTm8CAgcUn=X=F8g@mail.gmail.com> In-Reply-To: <ebf49f31-7b9a-815e-3d04-aa44533f57ba@FreeBSD.org> References: <CAKOb=YaLSPPRrLWGPbcDt0tKqS2h3mT2dLo92aK3r-8O%2B3SHTw@mail.gmail.com> <233f3723-a78e-91db-ebe6-9e13c1c9b50d@FreeBSD.org> <CAKOb=YYkuH=8Q94wi=q_zB%2BMS%2BNWXr5Q3_VRarYS5zTz%2BSPfUw@mail.gmail.com> <ebf49f31-7b9a-815e-3d04-aa44533f57ba@FreeBSD.org>
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On Mon, Mar 4, 2019 at 5:29 PM Andriy Gapon <avg@freebsd.org> wrote:
> On 04/03/2019 22:35, Nick Rogers wrote:
> > v_lock = {lock_object = {lo_name =
> > 0xffffffff8144af45 "zfs", lo_flags = 117112840, lo_data = 0, lo_witness =
> > 0x0}, lk_lock = 18446744073709551605, lk_exslpfail = 0, lk_timo = 51,
> > lk_pri = 96}
>
> Hmm, lk_lock looks bogus.
> 18446744073709551605 == 0xfffffffffffffff5 and it's LK_SHARE |
> LK_EXCLUSIVE_WAITERS with 0xfffffffffffffff shared owners.
> Perhaps, this is a result of LK_SHARERS_LOCK(-1).
>
> Is your kernel compiled with INVARIANTS and INVARIANT_SUPPORT?
> I suspect that the vnode was accessed (unlocked?) through a stale pointer
> after
> it was recycled.
>
I don't believe so - it's basically amd64 GENERIC w/ a reduced set of
modules and static zfs option.
> --
> Andriy Gapon
>
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