linux-kernel - Re: [init] 40caa127f3: kernel_BUG_at

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Date:   Mon, 13 Sep 2021 09:19:31 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [init]  40caa127f3: kernel_BUG_at_arch/x86/mm/physaddr.c

Hi,

Oops, sorry this is my mistake that I mixed kfree() behevior and memblock_free() behevior.
(memblock_free() is NOT NULL safe)

Let me fix that soon.

Thank you,

On Sun, 12 Sep 2021 22:08:20 +0800
kernel test robot <oliver.sang@...el.com> wrote:

> 
> 
> Greeting,
> 
> FYI, we noticed the following commit (built with clang-14):
> 
> commit: 40caa127f3c7279c75cb0c9684559fa314ee3a66 ("init: bootconfig: Remove all bootconfig data when the init memory is removed")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> 
> in testcase: boot
> 
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
> 
> 
> 
> [   17.504659][    T1] ------------[ cut here ]------------
> [   17.505585][    T1] kernel BUG at arch/x86/mm/physaddr.c:76!
> [   17.506561][    T1] invalid opcode: 0000 [#1] SMP
> [   17.507339][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-rc2-00062-g40caa127f3c7 #1 00c78f7b688292d34ec614a62bcd66d7bca8c06c
> [   17.509340][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> [   17.510823][    T1] EIP: __phys_addr+0x48/0x80
> [   17.511538][    T1] Code: 1d 16 00 84 80 12 f8 c2 80 12 f8 c2 89 f1 c1 e9 89 f1 c1 e9 29 89 f8 e8 29 89 f8 e8 39 f0 75 2a 39 f0 75 2a 5d c3 0f 0b 5d c3 <0f> 0b c2 e8 6c 69 c2 e8 6c 69 68 10 c0 28 68 10 c0 28 6a 00 0f 0b
> [   17.514699][    T1] EAX: 00000000 EBX: c1d19f90 ECX: 00000000 EDX: c10878dc
> [   17.515909][    T1] ESI: 40000000 EDI: 00000000 EBP: c016ff90 ESP: c016ff88
> [   17.517114][    T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010207
> [   17.518380][    T1] CR0: 80050033 CR2: 00000000 CR3: 02895000 CR4: 00040690
> [   17.519575][    T1] Call Trace:
> [   17.520137][    T1]  xbc_destroy_all+0x22/0x3b
> [   17.520863][    T1]  kernel_init+0x1c/0x180
> [   17.521533][    T1]  ret_from_fork+0x19/0x24
> [   17.522233][    T1] Modules linked in:
> [   17.522923][    T1] ---[ end trace a86c2af2528aa089 ]---
> [   17.523863][    T1] EIP: __phys_addr+0x48/0x80
> [   17.524612][    T1] Code: 1d 16 00 84 80 12 f8 c2 80 12 f8 c2 89 f1 c1 e9 89 f1 c1 e9 29 89 f8 e8 29 89 f8 e8 39 f0 75 2a 39 f0 75 2a 5d c3 0f 0b 5d c3 <0f> 0b c2 e8 6c 69 c2 e8 6c 69 68 10 c0 28 68 10 c0 28 6a 00 0f 0b
> [   17.527796][    T1] EAX: 00000000 EBX: c1d19f90 ECX: 00000000 EDX: c10878dc
> [   17.528969][    T1] ESI: 40000000 EDI: 00000000 EBP: c016ff90 ESP: c016ff88
> [   17.530128][    T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010207
> [   17.531302][    T1] CR0: 80050033 CR2: 00000000 CR3: 02895000 CR4: 00040690
> [   17.532427][    T1] Kernel panic - not syncing: Fatal exception
> [   17.533500][    T1] Kernel Offset: disabled
> 
> 
> 
> 
> To reproduce:
> 
>         # build kernel
> 	cd linux
> 	cp config-5.14.0-rc2-00062-g40caa127f3c7 .config
> 	make HOSTCC=clang-14 CC=clang-14 ARCH=i386 olddefconfig prepare modules_prepare bzImage
> 
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
> 
> 
> 
> ---
> 0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
> https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation
> 
> Thanks,
> Oliver Sang
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>