[Bug 252608] [panic] [usb] [if_ure] Kernel fault on ure disconnect

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252608

--- Comment #3 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
I suspect "sc->sc_txavail" is not properly managed at shutdown and that freed
USB transfers are kicked alive again.

Adding jmg@

Likely it is just more safe to kick all the transfers when there is a packet
for TX and not have some many USB TX transfers.

--HPS

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