linux-kernel - Re: [lkp] [staging] d4f56b47a8: divide error: 0000 [#1] PREEMPT SMP KASAN

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Date:   Fri, 30 Sep 2016 10:52:17 +0800
From:   Ye Xiaolong <xiaolong.ye@...el.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Bryan O'Donoghue <pure.logic@...us-software.ie>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, LKP ML <lkp@...org>,
        Alex Elder <elder@...aro.org>, Johan Hovold <johan@...nel.org>
Subject: Re: [lkp] [staging] d4f56b47a8: divide error: 0000 [#1] PREEMPT SMP
 KASAN

On 09/30, Viresh Kumar wrote:
>On Fri, Sep 30, 2016 at 7:29 AM, kernel test robot
><xiaolong.ye@...el.com> wrote:
>>
>>
>> FYI, we noticed the following commit:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>> commit d4f56b47a8fac90b15adfae80a42a2735d6b3213 ("staging: greybus: Add drivers/staging/greybus to the build")
>>
>> in testcase: trinity
>> with following parameters:
>>
>>         runtime: 300s
>>
>>
>> Trinity is a linux system call fuzz tester.
>>
>>
>> on test machine: qemu-system-x86_64 -enable-kvm -m 512M
>>
>> caused below changes:
>>
>>
>> +------------------------------------------------+------------+------------+
>> |                                                | 526dec0642 | d4f56b47a8 |
>> +------------------------------------------------+------------+------------+
>> | boot_successes                                 | 5          | 0          |
>> | boot_failures                                  | 8          | 12         |
>> | calltrace:SyS_open                             | 8          |            |
>> | invoked_oom-killer:gfp_mask=0x                 | 1          |            |
>> | Mem-Info                                       | 1          |            |
>> | IP-Config:Auto-configuration_of_network_failed | 2          |            |
>> | BUG:kernel_hang_in_test_stage                  | 6          |            |
>> | divide_error:#[##]PREEMPT_SMP_KASAN            | 0          | 12         |
>> | RIP:gb_timesync_init                           | 0          | 12         |
>> | calltrace:gb_init                              | 0          | 12         |
>> | Kernel_panic-not_syncing:Fatal_exception       | 0          | 12         |
>> +------------------------------------------------+------------+------------+
>>
>>
>>
>> [   16.795543] FPGA image file name: xlinx_fpga_firmware.bit
>> [   16.796615] GPIO INIT FAIL!!
>> [   16.799462] Unable to find a compatible ARMv7 timer
>> [   16.799948] divide error: 0000 [#1] PREEMPT SMP KASAN
>> [   16.800459] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-rc6-02364-gd4f56b4 #29
>> [   16.801197] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
>> [   16.802055] task: ffff88001a124000 task.stack: ffff88001a140000
>> [   16.802645] RIP: 0010:[<ffffffff82f67e97>]  [<ffffffff82f67e97>] gb_timesync_init+0x35/0x78
>> [   16.803534] RSP: 0000:ffff88001a147e58  EFLAGS: 00010246
>> [   16.804040] RAX: 00038d7ea4c68000 RBX: 0000000000000000 RCX: ffffffff8114ea41
>> [   16.804716] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88001a124c2c
>> [   16.805393] RBP: ffff88001a147e60 R08: 0000000000000001 R09: 0000000000000000
>> [   16.806066] R10: ffff88001a147d70 R11: ffffffff83cddb35 R12: ffffffff82f67cc6
>> [   16.806744] R13: 0000000000000000 R14: ffffffff82fbe8b0 R15: ffffffff82fbe8f8
>> [   16.807421] FS:  0000000000000000(0000) GS:ffff88001a400000(0000) knlGS:0000000000000000
>> [   16.808185] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [   16.808728] CR2: 0000000000000000 CR3: 0000000002c0a000 CR4: 00000000000006b0
>> [   16.809405] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [   16.810078] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> [   16.810752] Stack:
>> [   16.811058]  0000000000000000 ffff88001a147e78 ffffffff82f67d45 00000000ffffffff
>> [   16.811819]  ffff88001a147ee8 ffffffff82efe339 ffffffff82b89800 0000000000000012
>> [   16.812576]  ffff88001fa80fe5 0000000000000000 ffffffff82b0495f 0000000000000006
>> [   16.813332] Call Trace:
>> [   16.813577]  [<ffffffff82f67d45>] gb_init+0x7f/0xb3
>> [   16.814045]  [<ffffffff82efe339>] do_one_initcall+0x9a/0x12c
>> [   16.814588]  [<ffffffff82efe57b>] kernel_init_freeable+0x1b0/0x246
>> [   16.815180]  [<ffffffff82404a51>] kernel_init+0xc/0x108
>> [   16.815679]  [<ffffffff8240e40f>] ret_from_fork+0x1f/0x40
>> [   16.816197]  [<ffffffff82404a45>] ? rest_init+0x13c/0x13c
>> [   16.816724] Code: 85 c0 89 c3 74 12 48 c7 c7 64 ae b4 82 31 c0 e8 40 b5 27 fe 89 d8 eb 53 e8 cb 55 23 ff 31 d2 89 c6 48 b8 00 80 c6 a4 7e 8d 03 00 <48> f7 f6 31 d2 48 c7 c7 84 ae b4 82 48 89 35 de 65 64 01 48 89
>> [   16.819509] RIP  [<ffffffff82f67e97>] gb_timesync_init+0x35/0x78
>> [   16.820094]  RSP <ffff88001a147e58>
>> [   16.820548] ---[ end trace c73ba0f929e81492 ]---
>> [   16.821001] Kernel panic - not syncing: Fatal exception
>
>Can you please confirm if below patch fixes it for you ?
>
>https://marc.info/?l=linux-kernel&m=147490908100954

Sure, I'll verify it and provide the result later.

Thanks,
Xiaolong