linux-kernel - Re: [tip:tmp.tmp] [sched/fair] eb2db043ab: BUG:kernel_NULL_pointer

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Message-ID: <20251128093430.GE3245006@noisy.programming.kicks-ass.net>
Date: Fri, 28 Nov 2025 10:34:30 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Oliver Sang <oliver.sang@...el.com>
Cc: Ingo Molnar <mingo@...nel.org>, Tim Chen <tim.c.chen@...ux.intel.com>,
	oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
	x86@...nel.org, Chen Yu <yu.c.chen@...el.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Srikar Dronamraju <srikar@...ux.ibm.com>,
	Mohini Narkhede <mohini.narkhede@...el.com>,
	aubrey.li@...ux.intel.com
Subject: Re: [tip:tmp.tmp] [sched/fair]  eb2db043ab:
 BUG:kernel_NULL_pointer_dereference,address

On Fri, Nov 28, 2025 at 09:42:04AM +0800, Oliver Sang wrote:
> hi,
> 
> On Thu, Nov 27, 2025 at 10:07:28AM +0100, Ingo Molnar wrote:
> > 
> > * Peter Zijlstra <peterz@...radead.org> wrote:
> > 
> > > On Thu, Nov 27, 2025 at 04:35:37PM +0800, kernel test robot wrote:
> > > > 
> > > > 
> > > > Hello,
> > > > 
> > > > kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on:
> > > > 
> > > > commit: eb2db043ab3a28ae76800f2a57e144420800d56d ("sched/fair: Skip sched_balance_running cmpxchg when balance is not due")
> > > > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git tmp.tmp
> > > 
> > > Not sure what this branch is, but tip/sched/core has the fixed commit.
> > 
> > Not sure how the test-bot picked up this temporary 
> > branch and reported it despite it being gone from the 
> > repo, but the branch hasn't been in -tip for days.
> > 
> > This report can be safely ignored.
> 
> sorry for the noise. yeah, our so-called 'gitmirror' mechnism fetched the
> tmp.tmp branch about 10 days ago, then it merged into our hourly kernel to
> be running tests. so it's kind of 'stored' in our repo.
> 
> since the bad commit caused crash issue on various test machines, we made out
> the report, but missed the check of whether branch is still existing remotely.
> 
> we will refine our code/process to avoid this kind of meaningless report.

Might it make sense to exclude all branches named tmp ? IIRC there are
some patterns that the robot skips over, but I forever forget what they
are :/