Date: Mon, 9 Dec 2019 10:52:39 -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: <20191209185239.GA1056@troutmask.apl.washington.edu> In-Reply-To: <20191207021148.GB1234@troutmask.apl.washington.edu> 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> <20191207021148.GB1234@troutmask.apl.washington.edu>
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On Fri, Dec 06, 2019 at 06:11:48PM -0800, Steve Kargl wrote: > 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. > keyboard isn't available prior to the hang. A kernel built at 355010 hangs. This includes kernels built with and without INVARIANTS, INVARIANT_SUPPORT, WITNESS, and WITNESS_SKIPSPIN. This includes adding "kern.cam.boot_delay=30000" to /boot/loader.conf. Adding "hw.usb.debug=1", "hw.usb.umass.debug=1", "hw.usb.ctrl.debug=1", "hw.usb.xhci.debug=1", "hw.usb.uhci.debug=1", "hw.usb.ohci.debug=1", and "hw.usb.ehci.debug=1" shows no usb related output on the console when booting the 355010 kernel; whereas, a 355009 kernel floods the console. Unfortunately, I'm not a kernel hacker and I have run out of time trying to report an issue. -- Steve
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