linux-kernel - Re: [lkp-robot] e5a305ac4a: WARNING:at_lib/list_debug.c:#__list_del_entry

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Date:   Wed, 18 Jan 2017 13:09:02 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     Matthew Wilcox <willy@...ux.intel.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Matthew Wilcox <willy@...radead.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...org
Subject: Re: [lkp-robot] e5a305ac4a:
 WARNING:at_lib/list_debug.c:#__list_del_entry_valid

On Wed, 18 Jan 2017 09:23:04 +0800 kernel test robot <xiaolong.ye@...el.com> wrote:

> 
> FYI, we noticed the following commit:
> 
> commit: e5a305ac4a5233e039586c97f4ea643a4c7dc484 ("Reimplement IDR and IDA using the radix tree")
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> 
> in testcase: trinity
> with following parameters:
> 
> 	runtime: 300s
> 
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
> 
> 
> on test machine: qemu-system-i386 -enable-kvm -m 256M
> 
> ...
> 
> [    2.963488] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
> [    2.964998] evbug: Connected device: input1 (AT Translated Set 2 keyboard at isa0060/serio0/input0)
> [    2.966202] ------------[ cut here ]------------
> [    2.966844] WARNING: CPU: 0 PID: 14 at lib/list_debug.c:55 __list_del_entry_valid+0x43/0xb0
> [    2.968198] list_del corruption. next->prev should be bc904168, but was b215df80
> [    2.969171] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.10.0-rc2-02114-ge5a305a #1
> [    2.970209] Workqueue: events_long serio_handle_event
> [    2.970893] Call Trace:
> [    2.971217]  dump_stack+0x16/0x19
> [    2.971677]  __warn+0xa5/0xc0
> [    2.972074]  warn_slowpath_fmt+0x28/0x30

Thanks.

That isn't a very good backtrace.  Is that really the entire output?

> 
> To reproduce:
> 
>         git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
>         cd lkp-tests
>         bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email