Date: Sat, 13 Jul 2024 23:19:50 -0400 From: Garrett Wollman <wollman@bimajority.org> To: Rick Macklem <rick.macklem@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Possible bug in zfs send or pipe implementation? Message-ID: <26259.17366.276955.824313@hergotha.csail.mit.edu> In-Reply-To: <CAM5tNy4pPF9mHdXM5W6gjztm4_TtFfXnOLu3cdkqvaRf3Ab5uA@mail.gmail.com> References: <26259.12713.114036.564205@hergotha.csail.mit.edu> <CAM5tNy4pPF9mHdXM5W6gjztm4_TtFfXnOLu3cdkqvaRf3Ab5uA@mail.gmail.com>
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<<On Sat, 13 Jul 2024 19:42:32 -0700, Rick Macklem <rick.macklem@gmail.com> said: > # ps axHl > should show you what wchan's the processes are waiting on and that might > 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. > 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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