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Re: kern/53447: usb lock problem, mutex_enter

The following reply was made to PR kern/53447; it has been noted by GNATS.

From: Phil Nelson <>
Subject: Re: kern/53447: usb lock problem, mutex_enter
Date: Fri, 13 Jul 2018 06:18:48 -0700

 On Friday 13 July 2018 05:10:01 Christos Zoulas wrote:
 > =A0Take out the cold conditional from the predicate function; it should w=
 > =A0as before then.
 It didn't initially have the problem, so I typed a couple of characters and=
 then backspaced to type the correct thing and got:
 panic:  LOCKDEBUG: Kernel lock error: _kernel_lock,220: spinout
 cpu3: Begin traceback...
 vpanic() at ...
 snprintf() at ...
 lockdebug_more() at ...
 _kernel_lock() at ...+0x1de
 usb_transfer_complete() at ...+0x161
 xhci_softintr() ...+0x492
 xhci_poll() at ...+0x37
 ukbd_cngetc() ...+0x113

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