Messages in this thread |  | | From | Linus Torvalds <> | Date | Mon, 3 Oct 2016 21:12:48 -0700 | Subject | Re: BUG_ON() in workingset_node_shadows_dec() triggers |
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On Mon, Oct 3, 2016 at 9:07 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > > Well, it's a VM_BUG_ON and few people run with CONFIG_DEBUG_VM.
Ehh. If by "few people" you mean "pretty much everybody", you'd be right, but your choice of wording would be somewhat misleading, wouldn't you say?
Hint: here's a line from the standard Fedora kernel config:
CONFIG_DEBUG_VM=y
so *no*. VM_BUG_ON() is no less deadly than a regular BUG_ON(). It just allows some people to build smaller kernels, but apparently distro people would rather have debugging than save a few kB of RAM.
The VM debvugging code has VM_WARN_ON() and VM_WARN_ON_ONCE() for people who want to get a "oops, my assumptions were wrong"
Killing machines because somebody made an assumption that was wrong is not ok.
Killing the machine is ok if we have a situation where there literally is no other choice.
Linus
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