Date: Tue, 24 Sep 2024 13:32:37 -0400 From: J David <j.david.lists@gmail.com> To: Rick Macklem <rick.macklem@gmail.com> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: panic: nfsv4root ref cnt cpuid = 1 Message-ID: <CABXB=RTPE4xwE7nCAOoQS_GufL%2BX7UwN%2BiA9vaP7JjDafRTESg@mail.gmail.com> In-Reply-To: <CAM5tNy6L7C6f1rN2%2BkUaC_TdfMQkTfCS38BqE=RU60E9VExgww@mail.gmail.com> References: <CABXB=RShoxwT3PuPQK9OdJNBbWrShUuYchK7oVnT7gBbLH5D0w@mail.gmail.com> <CABXB=RRKvfiwipfaaNA%2BAuA3Ug1VLyNvxa_o-5hWEq1-qjjTbg@mail.gmail.com> <CAM5tNy5Hh=6b9ZNseeQsRddLSFehiTsYNZOH==CeAGthie5SQw@mail.gmail.com> <CABXB=RRDG6-_NU1rjrmT86Hv7uDRzSAbj-HP5ryd1WQ6ZUZNTA@mail.gmail.com> <CABXB=RQZ4jjWe39Nd26u66ZQURjvybL5eCeGX=n%2Bk3EaJRdfZQ@mail.gmail.com> <CAM5tNy6L7C6f1rN2%2BkUaC_TdfMQkTfCS38BqE=RU60E9VExgww@mail.gmail.com>
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On Mon, Sep 23, 2024 at 6:38=E2=80=AFPM Rick Macklem <rick.macklem@gmail.co=
m> wrote:
> If you can easily get the source line# for nfsrpc_lookup+0x87f, that
> could be helpful.
Sure. I did it via lldb and got nfs_clrpcops.c 1697. Your method gives
the same result.
According to the github version of 14.1-RELEASE, that's the "if (ndp
!=3D NULL) {" after the call to nfscl_openrelease().
Per lldb, the actual instruction at that address is:
testq %r13, %r13
My knowledge of amd64 assembler is nearly nil, but I *think* this
corresponds to checking if ndp is null. And I think that %r13 is a
register, so I'm not sure that could cause a page fault. Maybe the
trace indicates that that's the line it would have come back to if
something in nfscl_openrelease() hadn't gone wrong?
Thanks!
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