Re: Kernel Oops on Unexpected Disconnect of /dev/ttyUSBx Device

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On Tue, 24 Nov 2009, Greg KH wrote:

> > I don't know how to do a 'git bisect', nor do I have the time to learn 
> > just at the moment. However, I have pinpointed the broken release to 
> > 2.6.27.23. If I run my tests on 2.6.27.22 I do _not_ see the problem. But
> > when I perform the same tests on 2.6.27.23 the kernel oops starts happening
> > 100% of the time. 
> 
> Heh, you just did bisect it down to the range of changes, which is what
> I asked for, thanks :)
> 
> Alan, this points to your 2d93148ab6988cad872e65d694c95e8944e1b626
> commit that was added to the 2.6.27.23 kernel.

Not necessarily; it could be caused by Alan Cox's changes to the TTY 
core, if any occurred between those two releases.

Here's something rather confusing.  The URL:

http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.27.y.git;a=commit;h=2d93148ab6988cad872e65d694c95e8944e1b62

brings up a page containing the commit you mentioned above.  But that
commit was never added to the 2.6.27.y tree!  It's part of Linus's main
tree.  The actual commit applied as part of 2.6.27.23 was
070bb0f3b6df167554f0ecdeb17a5bcdb1cd7b83.  So what's going on here?

> Hm, maybe that means we need to also add your
> f9c99bb8b3a1ec81af68d484a551307326c2e933 commit, what do you think?

That seems likely.  Let me work on back-porting it today.  Rory can try 
it out over the holiday weekend.

Alan Stern

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