Date: Mon, 27 Aug 2007 16:49:57 +0530 From: "Rahul Siddharthan" <rsidd120@gmail.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-usb@freebsd.org Subject: Re: usb/105361: [panic] Kernel panic during unmounting mass storage (Creative mp3 player) Message-ID: <6a506d980708270419v561ad40ap1b73dd73e2bf87c7@mail.gmail.com> In-Reply-To: <6a506d980708250932q7843f3a0u17240d7fb9033164@mail.gmail.com> References: <200708241010.l7OAA7bl066026@freefall.freebsd.org> <20070824.212230.-957833176.imp@bsdimp.com> <6a506d980708242103j6d34449exadf3debc1275656f@mail.gmail.com> <20070825.093151.2040712281.imp@bsdimp.com> <6a506d980708250932q7843f3a0u17240d7fb9033164@mail.gmail.com>
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I wrote: > However, I take back what I said about the problem being fixed by > commenting out the clear endpoint stall thing. It's not working any > more -- and, moreover, the hard disk light stays on after I insert the > USB stick. And if I remove it, there's an instant panic. > > I have now reverted that change to usb_subr.c. Now it lets me insert the > stick and remove it, but if I do that 2-3 times (not in quick succession), > it panics. Below is a backtrace. Let me reiterate that nothing is being mounted here -- the device is not even being registered as a SCSI drive. Digging further in the archives, I just came across a long thread on unmount panics in freebsd-stable in July, including posts from you (Warner) acknowledging that it's a serious problem but saying fixing it will be horrendously difficult because of historical assumptions at all levels in the VM/buffer-cache/etc that "devices don't go away". But this doesn't seem to be that problem. I can't believe I'm the only one seeing it. If you can't reproduce it, I'm happy to mail you the device in question (which works nicely on linux and windows). Rahul
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