Date: Fri, 14 Nov 2025 14:09:11 +0100 (CET) From: Ronald Klop <ronald-lists@klop.ws> To: Rick Macklem <rick.macklem@gmail.com> Cc: freebsd-fs@freebsd.org, Mark Millard <marklmi@yahoo.com>, Ronald Klop <ronald@freebsd.org> Subject: Re: nfs hang Message-ID: <1159959906.6785.1763125751886@localhost> In-Reply-To: <CAM5tNy7FYVVPaV8i9DUrwxL3%2BSEm8yXxpvT_oQSdgTuid9nBmw@mail.gmail.com> References: <A3D0678A-F5AC-449A-BC71-13D61F2D4A04@yahoo.com> <CAM5tNy7FYVVPaV8i9DUrwxL3%2BSEm8yXxpvT_oQSdgTuid9nBmw@mail.gmail.com>
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[-- Attachment #1 --] Van: Rick Macklem <rick.macklem@gmail.com> Datum: vrijdag, 14 november 2025 12:53 Aan: Mark Millard <marklmi@yahoo.com> CC: Ronald Klop <ronald@freebsd.org>, freebsd-fs@freebsd.org Onderwerp: Re: nfs hang > > On Thu, Nov 13, 2025 at 4:51PM Mark Millard <marklmi@yahoo.com> wrote: > > > > Ronald Klop <ronald_at_FreeBSD.org> wrote on > > Date: Thu, 13 Nov 2025 17:17:48 UTC : > > > > > Op 13-11-2025 om 14:06 schreef Rick Macklem: > > > > On Thu, Nov 13, 2025 at 2:45AM Ronald Klop <ronald@freebsd.org> wrote: > > > >> > > > >> Op 13-11-2025 om 11:41 schreef Ronald Klop: > > > >>> . . . > > > >>> > > > >>> > > > >> > > > >> > > > >> . . . > > > > Do you have more than one client mounting the file system? > > > > If you do, make sure they all have different /etc/hostid's. > > > > (Cloning a system disk without deleting /etc/hostid can > > > > result in multiple clients with the same /etc/hostid. That > > > > mean they are "the same client" to the NFSv4 server > > > > and that can cause the above.) > > > > > > > > If this is not the problem, I don't know why you'd see the > > > > above but I suspect the above explains the hang. > > > > > > > > rick > > > > > > > > > > > > > Two clients. Both have different /etc/hostid. > > > > > > I noticed that the procstat stacks start with "null_reclaim". And poudriere null-mounts the nfs mounts in the poudriere-jails. > > > > Do the poudriere jails on each host use the host's /etc/hostid (by content)? > > > > Any worries about needing poudriere jail /etc/hostid content uniqueness? > From NFSv4's point of view, /etc/hostid is used at mount time. > The client will use the one outside of any jail, since that is where the > mount is done from. > > Now, although I was thinking about the client (since that is where > the hangs occur), it might be an issue if you were running the nfsd > in multiple jails that have the same /etc/hostid as well. > --> The server identifies itself to the client via the /etc/hostid and > a different identity means different server. > However, it could be a problem if the servers in different jails > return the "same server" from the same /etc/hostid. > > I'll admit it as been years since I did the "run nfsd in a vnet jail" > code and I don't remember if the use of /etc/hostid is vnet'd or > not. > > rick > > > > > > Could nfs+nullfs give some trouble? Or maybe it is just nullfs that hangs everything and the nfs stuff is just a result of it. > > > > > > At the same moment I had git hanging on a non-NFS mount. See attachment for the procstat which also includes nfs-calls. > > > > === > > Mark Millard > > marklmi at yahoo.com > > > > > I only have 1 nfs server. My vnet jail that runs nfsd does not have /etc/hostid. /etc/rc.d/hostid and hostid_save have the keyword nojail so they never run inside a jail (AFAIK). # sysctl kern.hostid kern.hostid: 0 Is that an issue? Regards, Ronald. [-- Attachment #2 --] <html><head></head><body><br> <p><strong>Van:</strong> Rick Macklem <rick.macklem@gmail.com><br> <strong>Datum:</strong> vrijdag, 14 november 2025 12:53<br> <strong>Aan:</strong> Mark Millard <marklmi@yahoo.com><br> <strong>CC:</strong> Ronald Klop <ronald@freebsd.org>, freebsd-fs@freebsd.org<br> <strong>Onderwerp:</strong> Re: nfs hang</p> <blockquote style="padding-right: 0px; padding-left: 5px; margin-left: 5px; border-left: #000000 2px solid; margin-right: 0px"> <div class="MessageRFC822Viewer" id="P"> <div class="TextPlainViewer" id="P.P">On Thu, Nov 13, 2025 at 4:51PM Mark Millard <marklmi@yahoo.com> wrote:<br> ><br> > Ronald Klop <ronald_at_FreeBSD.org> wrote on<br> > Date: Thu, 13 Nov 2025 17:17:48 UTC :<br> ><br> > > Op 13-11-2025 om 14:06 schreef Rick Macklem:<br> > > > On Thu, Nov 13, 2025 at 2:45AM Ronald Klop <ronald@freebsd.org> wrote:<br> > > >><br> > > >> Op 13-11-2025 om 11:41 schreef Ronald Klop:<br> > > >>> . . .<br> > > >>><br> > > >>><br> > > >><br> > > >><br> > > >> . . .<br> > > > Do you have more than one client mounting the file system?<br> > > > If you do, make sure they all have different /etc/hostid's.<br> > > > (Cloning a system disk without deleting /etc/hostid can<br> > > > result in multiple clients with the same /etc/hostid. That<br> > > > mean they are "the same client" to the NFSv4 server<br> > > > and that can cause the above.)<br> > > ><br> > > > If this is not the problem, I don't know why you'd see the<br> > > > above but I suspect the above explains the hang.<br> > > ><br> > > > rick<br> > > ><br> > ><br> > ><br> > > Two clients. Both have different /etc/hostid.<br> > ><br> > > I noticed that the procstat stacks start with "null_reclaim". And poudriere null-mounts the nfs mounts in the poudriere-jails.<br> ><br> > Do the poudriere jails on each host use the host's /etc/hostid (by content)?<br> ><br> > Any worries about needing poudriere jail /etc/hostid content uniqueness?<br> >From NFSv4's point of view, /etc/hostid is used at mount time.<br> The client will use the one outside of any jail, since that is where the<br> mount is done from.<br> <br> Now, although I was thinking about the client (since that is where<br> the hangs occur), it might be an issue if you were running the nfsd<br> in multiple jails that have the same /etc/hostid as well.<br> --> The server identifies itself to the client via the /etc/hostid and<br> a different identity means different server.<br> However, it could be a problem if the servers in different jails<br> return the "same server" from the same /etc/hostid.<br> <br> I'll admit it as been years since I did the "run nfsd in a vnet jail"<br> code and I don't remember if the use of /etc/hostid is vnet'd or<br> not.<br> <br> rick<br> <br> ><br> > > Could nfs+nullfs give some trouble? Or maybe it is just nullfs that hangs everything and the nfs stuff is just a result of it.<br> > ><br> > > At the same moment I had git hanging on a non-NFS mount. See attachment for the procstat which also includes nfs-calls.<br> ><br> > ===<br> > Mark Millard<br> > marklmi at yahoo.com<br> ></div> <hr></div> </blockquote> <br> <br> I only have 1 nfs server.<br> My vnet jail that runs nfsd does not have /etc/hostid.<br> <br> /etc/rc.d/hostid and hostid_save have the keyword nojail so they never run inside a jail (AFAIK).<br> # sysctl kern.hostid<br> kern.hostid: 0<br> <br> Is that an issue?<br> <br> Regards,<br> Ronald.<br> </body></html>home | help
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