linux-kernel - Re: [lkp-robot] [rcu] b332151a29: kernel_BUG_at

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Date:   Fri, 20 Jan 2017 08:09:36 -0800
From:   Jens Axboe <axboe@...nel.dk>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        kernel test robot <xiaolong.ye@...el.com>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org,
        linux-scsi@...r.kernel.org, tglx@...utronix.de,
        linux-block@...r.kernel.org
Subject: Re: [lkp-robot] [rcu] b332151a29: kernel_BUG_at_mm/slab.c

On 01/20/2017 08:01 AM, Sebastian Andrzej Siewior wrote:
> On 2017-01-19 09:02:16 [+0800], kernel test robot wrote:
>> test-description: Trinity is a linux system call fuzz tester.
> 
> you don't even get to fire up trinity. With and without the patch you
> crash very early.
> 
>> +-----------------------------------------------------+------------+------------+
>> |                                                     | d5f6ab9c11 | b332151a29 |
>> +-----------------------------------------------------+------------+------------+
>> | boot_successes                                      | 0          | 0          |
>> | boot_failures                                       | 6          | 8          |
>> | WARNING:at_include/linux/kref.h:#kobject_get        | 6          | 8          |
>> | WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 2          | 2          |
>> | kernel_BUG_at_mm/slab.c                             | 0          | 4          |
>> | invalid_opcode:#[##]PREEMPT_SMP                     | 0          | 4          |
>> | Kernel_panic-not_syncing:Fatal_exception            | 0          | 6          |
>> | BUG:unable_to_handle_kernel                         | 0          | 2          |
>> | Oops                                                | 0          | 2          |
>> +-----------------------------------------------------+------------+------------+
> 
> There is no successful boot. The pattern changes with patch in question
> applied.
> 
>> [    8.044624] sd 0:0:0:0: [sda] Synchronizing SCSI cache
>> [    8.055721] slab: double free detected in cache 'kmalloc-32', objp 8af558c0
>> [    8.057138] ------------[ cut here ]------------
>> [    8.058085] kernel BUG at mm/slab.c:2624!
>> [    8.059255] invalid opcode: 0000 [#1] PREEMPT SMP

Is there a full trace of this?

> yes. With and without the patch there is a lot of wrong stuff like
> complains about a kobject initialized again. This leads to a double free
> at some point.

And what patch are we talking about? I don't mind being CC'ed into a thread,
but some context and background would be immensely helpful here...

-- 
Jens Axboe