On Wed, Sep 8, 2021 at 4:12 PM Shuah Khan [off-list ref] wrote:

On 9/7/21 5:14 PM, Linus Torvalds wrote:

quoted

The KUNIT macros create all these individually reasonably small
initialized structures on stack, and when you have more than a small
handful of them the KUNIT infrastructure just makes the stack space
explode. Sometimes the compiler will be able to re-use the stack
slots, but it seems to be an iffy proposition to depend on it - it
seems to be a combination of luck and various config options.

I have been concerned about these macros creeping in for a while.
I will take a closer look and work with Brendan to come with a plan
to address it.

I've previously sent patches to turn off the structleak plugin for
any kunit test file to work around this, but only a few of those patches
got merged and new files have been added since. It would
definitely help to come up with a proper fix, but my structleak-disable
hack should be sufficient as a quick fix.

       Arnd