Re: Possible bug in zfs send or pipe implementation?

<<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