Panic with usb serial
M. Warner Losh
imp at bsdimp.com
Tue Apr 1 17:59:08 UTC 2008
In message: <20080329.191710.1169638035.imp at bsdimp.com>
"M. Warner Losh" <imp at bsdimp.com> writes:
: In message: <20080329222049.GA80263 at eos.sc1.parodius.com>
: Jeremy Chadwick <koitsu at freebsd.org> writes:
: : On Sat, Mar 29, 2008 at 10:11:04PM +0000, Vince wrote:
: : > Is it expected that removing a usb serial adapter while you have a
: : > connection (eg tip) using it will panic a -stable system? I know it is
: : > expected if you remove a mounted umass device so wanted to see if its known
: : > behavior for serial before I file a pr. (adapter is <FTDI usb serial
: : > converter, class 0/0, rev 1.10/4.00, addr 3>)
: : > -stable version as of the 25th march, (may have existed before but the
: : > first time I forgot to close tip before removing the device was on this
: : > version.)
: : I would expect that the problem is identical in the sense that with a
: : connection established, you have an open file descriptor which is
: : associated with a serial device that uses USB.
: : So, yes, I would expect this behaviour based on the track record.
: : Should it happen? The answer is no. File a PR?
: : Also, I'd like to know what USB serial adapter you're using (brand,
: : model, and a website of it if possible), for unrelated reasons. Thanks!
: That's odd, because I use an FTDI based serial device all the time for
: hacking on embedded systems. The problem that I have is 100% CPU
: usage on a tip process until I kill it.
Actually, the reason for this is that I fixed a bug that gave me
panics... During the review process, it was pointed out that others
had better changes. These have been included in -current, but I don't
think have been merged back to RELENG_7 yet. They aren't in 7.0.
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