[Bug 281560] gve (4) uma deadlock during high tcp throughput

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281560

--- Comment #16 from Mark Johnston <[email protected]> ---
This smells a bit like a thread disabled interrupts and then went off-CPU
somehow.  The iperf thread is stuck in the runqueue of a CPU and nothing gets
scheduled there, so it doesn't run.

If this is not enough of a hint, we could try enabling scheduler tracing:
- add the following to your kernel config:
options KTR
options KTR_COMPILE=(KTR_SCHED)
options KTR_ENTRIES=(256*1024)
- before starting your test, enable KTR tracing:
# sysctl debug.ktr.enable=0x20000000
- once the hang occurs, use ktrdump (or "show ktr" in DDB) to dump scheduler
traces

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