Messages in this thread | | | Date | Thu, 19 Jun 2014 15:39:47 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [REPOST PATCH 1/8] fence: dma-buf cross-device synchronization (v17) |
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On 06/19/2014 01:01 PM, Greg KH wrote: > On Thu, Jun 19, 2014 at 09:15:36PM +0200, Daniel Vetter wrote: >> On Thu, Jun 19, 2014 at 7:00 PM, Greg KH <gregkh@linuxfoundation.org> wrote: >>>>>> + BUG_ON(f1->context != f2->context); >>>>> >>>>> Nice, you just crashed the kernel, making it impossible to debug or >>>>> recover :( >>>> >>>> agreed, that should probably be 'if (WARN_ON(...)) return NULL;' >>>> >>>> (but at least I wouldn't expect to hit that under console_lock so you >>>> should at least see the last N lines of the backtrace on the screen >>>> ;-)) >>> >>> Lots of devices don't have console screens :) >> >> Aside: This is a pet peeve of mine and recently I've switched to >> rejecting all patch that have a BUG_ON, period. > > Please do, I have been for a few years now as well for the same reasons > you cite. >
I'm actually concerned about this trend. Downgrading things to WARN_ON can allow a security bug in the kernel to continue to exist, for example, or make the error message disappear.
I am wondering if the right thing here isn't to have a user (command line?) settable policy as to how to proceed on an assert violation, instead of hardcoding it at compile time.
-hpa
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