Re: Warning and BUG with btrfs and corrupted image

[Pavel Machek <pavel@suse.cz>]

> > > CONFIG_*_DEBUG means include *debug* code there to help developers,
> > > including adding additional failure tests into the kernel. Besides,
> > > which bit of "don't turn it on unless you are an XFS developer"
> > > don't you understand?
> > 
> > Yes, but DEBUG code is normally to help debugging, not to crash
> > kernels.
> 
> Crashing the kernel at exactly the point a problem is detected
> is often the simplest way of debugging the problem.
> 
> e.g. CONFIG_VM_DEBUG=y turns on VM_BUG_ON() which crashes the kernel
> whenever it detects something wrong. Do I turn it on? Yes. Do i

That's different. User is not supposed to be able to trigger
VM_BUG_ON().

> complain about it when I hit a VM_BUG_ON()? No, I report the
> bug and move on. If you turn on a DEBUG option, then you are
> asking the system to behave in a way useful to a developer,
> not an end user. That includes panicing when something wrong
> is detected.

Imagine vm going panic() on mkdir("/lost+found")...
								Pavel
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