Date: Sat, 15 Nov 2014 21:41:41 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-current@freebsd.org Subject: Re: USB locks up system -- WAS Re: shutdown or acpi problem Message-ID: <20141116054141.GA33186@troutmask.apl.washington.edu> In-Reply-To: <20141113212206.GA20802@troutmask.apl.washington.edu> References: <20141112224212.GA14013@troutmask.apl.washington.edu> <20141113172533.GA18690@troutmask.apl.washington.edu> <20141113180332.GA18990@troutmask.apl.washington.edu> <20141113181515.GA19117@troutmask.apl.washington.edu> <546515BF.6030508@selasky.org> <20141113212206.GA20802@troutmask.apl.washington.edu>
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On Thu, Nov 13, 2014 at 01:22:06PM -0800, Steve Kargl wrote: > On Thu, Nov 13, 2014 at 09:34:07PM +0100, Hans Petter Selasky wrote: > > On 11/13/14 19:15, Steve Kargl wrote: > > > On Thu, Nov 13, 2014 at 10:03:32AM -0800, Steve Kargl wrote: > > >> On Thu, Nov 13, 2014 at 09:25:33AM -0800, Steve Kargl wrote: > > >>> On Wed, Nov 12, 2014 at 02:42:13PM -0800, Steve Kargl wrote: > > >>>> I have a kernel/world from r274273 sources, which is exhibiting a new > > >>>> issue on my old laptop. Neither 'shutdown -p now' nor 'shutdown -r now' > > >>>> work. I get to the end of shutdown and see for example > > >>>> > > >>>> All buffers synced > > >>>> Uptime: 4h23m15s > > >>>> > > >>>> and then the laptop just sits there. It does not power off with > > >>>> the -p option nor does it reboot with the -r. Has anyone else > > >>>> seen this behavior? > > >>>> > > >>> > > >>> The problem appears to be related to a recent change in the > > >>> USB stack. If I have the following drive plugged into a > > >>> usb port, the above behavior is observed on shutdown. > > >>> > > > > > > Adding > > > > > > hw.usb.no_shutdown_wait: 1 > > > > > > to /boot/loader.conf appears to work around the 'shutdown -p now' > > > and 'shutdown -r now' issue. Unfortunately, the bricking of the > > > laptop is not affected by this sysctl. Once a device is plugged > > > into a usb, it must remain plugged in. > > > > > > > Hi, > > > > Is using this sysctl/tunable a suitable solution for you? > > > > The sysctl is a suitable solution for the shutdown issues. > It is not suitable solution for the general use of using > a memory stick to for example quickly transfer files. Once > the memory stick is plugged into the usb port, it must > remain there unless one wants to reboot the system. > > I rebuilt the kernel with USB_DEBUG and CAMDEBUG enabled. > I need to wade through a rather large /var/log/messages > to see if anything appears unusual. > Well, this has been a waste of a day. The problem is caused by r273872. This is the recent random device patch. I have no idea why removing a usb device would cause the system to lock up other than random is probably trying to harvest some entropy. -- Steve
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