Date: Sat, 13 Jul 2024 20:50:55 -0700 From: Rick Macklem <rick.macklem@gmail.com> To: Garrett Wollman <wollman@bimajority.org> Cc: freebsd-stable@freebsd.org Subject: Re: Possible bug in zfs send or pipe implementation? Message-ID: <CAM5tNy5m9-rqNTWJP5wAs9FewB6=FW9XbAe4V7qLgnrYJkSFKA@mail.gmail.com> In-Reply-To: <26259.17366.276955.824313@hergotha.csail.mit.edu> References: <26259.12713.114036.564205@hergotha.csail.mit.edu> <CAM5tNy4pPF9mHdXM5W6gjztm4_TtFfXnOLu3cdkqvaRf3Ab5uA@mail.gmail.com> <26259.17366.276955.824313@hergotha.csail.mit.edu>
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On Sat, Jul 13, 2024 at 8:19=E2=80=AFPM Garrett Wollman <wollman@bimajority= .org> wrote: > > <<On Sat, 13 Jul 2024 19:42:32 -0700, Rick Macklem <rick.macklem@gmail.co= m> said: > > > # ps axHl > > should show you what wchan's the processes are waiting on and that migh= t > > give you a clue w.r.t. what is happening? > > zfs is waiting to write into the pipe and pv (the progress meter) is > waiting in select. Just to clarify it, are you saying zfs is sleeping on "pipewr"? (There is also a msleep() for "pipbww" in pipe_write().) rick > > > If is easy to build a kernel from sources and boot that, you could try = defining > > PIPE_NODIRECT in sys/kern/sys_pipe.c and see if that avoids the hangs? > > It's easy to build a kernel from sources, but not easy to reboot the > server -- it's being retired shortly, and because of time constraints > I need to get it drained before the next scheduled outage. > > -GAWollman >
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