Re: linux-next: runtime warning in Linus' tree

From: Johannes Weiner
Date: Thu Aug 13 2020 - 11:21:43 EST

On Thu, Aug 13, 2020 at 04:46:54PM +1000, Stephen Rothwell wrote:
> [ 0.055220][ T0] WARNING: CPU: 0 PID: 0 at mm/memcontrol.c:5220 mem_cgroup_css_alloc+0x350/0x904

> [The line numbers in the final linux next are 5226 and 5141 due to
> later patches.]
> Introduced (or exposed) by commit
> 3e38e0aaca9e ("mm: memcg: charge memcg percpu memory to the parent cgroup")
> This commit actually adds the WARN_ON, so it either adds the bug that
> sets it off, or the bug already existed.
> Unfotunately, the version of this patch in linux-next up tuntil today
> is different. :-(

Sorry, I made a last-minute request to include these checks in that
patch to make the code a bit more robust, but they trigger a false
positive here. Let's remove them.