linux-kernel - Re: [LKP] Re: 28307d938f ("percpu: make pcpu_alloc() aware of current gfp .."): BUG: kernel reboot-without-warning in boot stage

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Date:   Wed, 3 Jun 2020 11:05:35 +0800
From:   Li Zhijian <zhijianx.li@...el.com>
To:     Filipe Manana <fdmanana@...e.com>,
        kernel test robot <lkp@...el.com>
Cc:     LKP <lkp@...ts.01.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        "Linus, Torvalds," <torvalds@...ux-foundation.org>
Subject: Re: [LKP] Re: 28307d938f ("percpu: make pcpu_alloc() aware of current
 gfp .."): BUG: kernel reboot-without-warning in boot stage

On 6/2/20 8:18 PM, Filipe Manana wrote:
> On 02/06/20 05:37, Li Zhijian wrote:
>> Hi Filipe,
>>
>> LKP checked blow dmesg as the indicator in this problem
>>
>>>> [    0.144174] RAMDISK: [mem 0x7fa2e000-0x7fffffff]
>>>> [    0.144559] ACPI: Early table checksum verification disabled
>>>> [    0.144985] ACPI: RSDP 0x00000000000F5850 000014 (v00 BOCHS )
>>>> [    0.145424] ACPI: RSDT 0x00000000BFFE15C9 000030 (v01 BOCHS
>>>> BXPCRSDT 00000001 BXPC 00000001)
>>>> [    0.146051] ACPI: FACP 0x00000000BFFE149D 000074 (v01 BOCHS
>>>> BXPCFACP 00000001 BXPC 00000001)
>>>> BUG: kernel reboot-without-warning in boot stage
>>>>
>> And i have reproduced it with script in attachment. this issue is gone
>> when i reverted this commit 28307d938f
>>
>> Please note that
>> - i reproduced it with kernel compiled by gcc-5
>> - i failed to reproduce it in kernel compiled by gcc-7 so far
> Odd.

Indeed !

i tested gcc-5 gcc-6 gcc-7, only gcc-5 triggered this issue, kernel 
built with gcc6 and gcc-7 works well

lizhijian@...o2-debian:~$ gcc-6 --version
gcc-6 (Debian 6.5.0-2) 6.5.0 20181026
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

lizhijian@...o2-debian:~$ gcc-5 --version
gcc-5 (Debian 5.5.0-12) 5.5.0 20171010
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

lizhijian@...o2-debian:~$ gcc-7 --version
gcc-7 (Debian 7.5.0-3) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Thanks
Zhijian

> Here I tested with:
>
> $ gcc --version
> gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
> Copyright (C) 2016 Free Software Foundation, Inc.
>