Date: Fri, 6 Dec 2019 18:11:48 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Hans Petter Selasky <hps@selasky.org> Cc: Alexander Motin <mav@freebsd.org>, Warner Losh <imp@bsdimp.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: CAM breaks USB [was Re: USB causing boot to hang] Message-ID: <20191207021148.GB1234@troutmask.apl.washington.edu> In-Reply-To: <3e5ead69-b933-70a4-a183-67552d8932fb@selasky.org> References: <20191206202316.GA1053@troutmask.apl.washington.edu> <20191206223144.GA3224@troutmask.apl.washington.edu> <CANCZdfrvTmb0xfQ_A6vLdzgNziSHSsD5TBiC1DCnriTaWcr-nw@mail.gmail.com> <20191206225231.GA949@troutmask.apl.washington.edu> <dd35656e-2cbb-f889-64dc-89d15c471e37@FreeBSD.org> <20191206234105.GA1027@troutmask.apl.washington.edu> <3df3ff25-9f62-6f0f-7823-e846a43725eb@FreeBSD.org> <3e5ead69-b933-70a4-a183-67552d8932fb@selasky.org>
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On Sat, Dec 07, 2019 at 01:16:13AM +0100, Hans Petter Selasky wrote: > > There is an option you can compile into the kernel which will allow the > keyboard to enter the debugger. > > options ALT_BREAK_TO_DEBUGGER > > Sounds to me like either a leaked refcount or that one thread is > spinning blocking execution of other threads. > I tried setting the sysctls hw.usb.umass.debug: 1 hw.usb.xhci.debug: 1 hw.usb.uhci.debug: 1 hw.usb.ohci.debug: 1 hw.usb.ehci.debug: 1 but when I rebooted I forgot to request a verbose boot. There was no apparent debugging output to the console. I try again on Monday to get additional information. -- Steve
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