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

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Message-ID: <aSj97AJbXnJvvyqK@xsang-OptiPlex-9020>
Date: Fri, 28 Nov 2025 09:42:04 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Ingo Molnar <mingo@...nel.org>
CC: Peter Zijlstra <peterz@...radead.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>,
	<oliver.sang@...el.com>
Subject: Re: [tip:tmp.tmp] [sched/fair]  eb2db043ab:
 BUG:kernel_NULL_pointer_dereference,address

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.

thanks

> 
> Thanks,
> 
> 	Ingo
>