Date: Wed, 14 Feb 2018 01:13:33 +0100 From: Polytropon <freebsd@edvax.de> To: Valeri Galtsev <galtsev@kicp.uchicago.edu> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: OT: just crashed two FreeBSD-11.1-RELEASE machines Message-ID: <20180214011333.23d616b9.freebsd@edvax.de> In-Reply-To: <cf4680fd-32fc-d22c-602d-b5445db51549@kicp.uchicago.edu> References: <cf4680fd-32fc-d22c-602d-b5445db51549@kicp.uchicago.edu>
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On Tue, 13 Feb 2018 16:56:12 -0600, Valeri Galtsev wrote: > I just crushed two (one at a time) FreeBSD-11.1-RELEASE machines. I > simply plugged my Sony video camera which was in the mode of exporting > its (msdos) filesystems over USB. Both machines have decent hardware, > plenty of resources. Regular user was logged in to X11. One of the > filesystems was mounted (the one holding AVCHD videos), and two seconds > later the machine started booting (like "crashed"). > > And now I'm sitting in prostration and thinking: What is that I will do > next? Gather debugging data. Reduce automatisms and check each step manually. Try to find out the exact "thing" that brought down the system (it's hard to tell when X is running and doing its "magic"). Many years ago, I had a similar problem, but when _detaching_ the camera from the system (internal filesystem was already unmounted, and previous access to it went as expected)... This was, I think, in FreeBSD 5 times, and after a system update, the problem went away. So I never found out what the actual problem was - but it could be reproduced any time, even in single user mode: insert USB plug, system recognizes da0 device (as intended), wait a few seconds, remove USB plug, system panic, kernel crash. After update: regular "disconnect" message, nothing else, system kept running. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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