linux-kernel - Re: [lkp] [sched] 817b8ebf33: WARNING: CPU: 0 PID: 2307 at kernel/fork.c:304 free

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Message-ID: <CALCETrU+7WzWO4mQD-6qNJMETpsWi6AQN+MepSf2R8B1FeuDRA@mail.gmail.com>
Date:	Fri, 8 Jul 2016 08:26:11 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	kernel test robot <xiaolong.ye@...el.com>
Cc:	Andy Lutomirski <luto@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>
Subject: Re: [lkp] [sched] 817b8ebf33: WARNING: CPU: 0 PID: 2307 at
 kernel/fork.c:304 free_task+0x2f/0x4c

On Fri, Jul 8, 2016 at 8:04 AM, Andy Lutomirski <luto@...capital.net> wrote:
> On Thu, Jul 7, 2016 at 6:17 PM, kernel test robot <xiaolong.ye@...el.com> wrote:
>>
>>
>> FYI, we noticed the following commit:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
>> commit 817b8ebf33c489948ee5db93ab7ed483619a53a5 ("sched: Free the stack early if CONFIG_THREAD_INFO_IN_TASK")
>>
>> in testcase: boot
>>
>> on test machine: 1 threads qemu-system-i386 -enable-kvm with 192M memory
>>
>> caused below changes:
>
> I think I've tracked this down to a harmless bug in dup_task_struct
> error handling.  Fixed now.

Correction, copy_process.  I was able to reproduce this, so I'm
reasonable sure I'm right.

-- 
Andy Lutomirski
AMA Capital Management, LLC