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In-Reply-To: <20170317115924.GA82960@inn.lkp.intel.com>
References: <20170317115924.GA82960@inn.lkp.intel.com>
From: Thomas Garnier <thgarnie@google.com>
Date: Fri, 17 Mar 2017 10:41:40 -0700
Message-ID: <CAJcbSZHVFhesnkOcegwRF3O_q-NS4fjbLqMd5z_kwXXwzc1CnA@mail.gmail.com>
Subject: Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>,
        Alexander Potapenko <glider@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Andy Lutomirski <luto@kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Borislav Petkov <bp@suse.de>, Chris Wilson <chris@chris-wilson.co.uk>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Jiri Kosina <jikos@kernel.org>, Joerg Roedel <joro@8bytes.org>,
        Jonathan Corbet <corbet@lwn.net>, Josh Poimboeuf <jpoimboe@redhat.com>,
        Juergen Gross <jgross@suse.com>, Kees Cook <keescook@chromium.org>,
        Len Brown <len.brown@intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Lorenzo Stoakes <lstoakes@gmail.com>,
        "Luis R . Rodriguez" <mcgrof@kernel.org>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        Michal Hocko <mhocko@suse.com>, Paolo Bonzini <pbonzini@redhat.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Pavel Machek <pavel@ucw.cz>, Peter Zijlstra <peterz@infradead.org>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Rusty Russell <rusty@rustcorp.com.au>,
        Stanislaw Gruszka <sgruszka@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>, zijun_hu <zijun_hu@htc.com>,
        LKML <linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        tipbuild@zytor.com, LKP <lkp@01.org>
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I tried multiple things to repro this crash without success:
 - Used the config on my existing qemu setup (boot fine)
 - Add most of the command-line (boot fine)
 - Try to run the script on a dedicated machine and it seems it is
really tailored for your setup. I had errors with usernames and cpio
crashing.

Any additional information you could share? (RIP -> function name,
callstack etc..?)

Thanks,

On Fri, Mar 17, 2017 at 4:59 AM, kernel test robot
<xiaolong.ye@intel.com> wrote:
>
> FYI, we noticed the following commit:
>
> commit: 45fc8757d1d2128e342b4e7ef39adedf7752faac ("x86: Make the GDT remapping read-only on 64-bit")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/mm
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -m 420M
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +------------------------------------------+------------+------------+
> |                                          | 69218e4799 | 45fc8757d1 |
> +------------------------------------------+------------+------------+
> | boot_successes                           | 8          | 2          |
> | boot_failures                            | 0          | 11         |
> | BUG:unable_to_handle_kernel              | 0          | 11         |
> | Oops:#[##]                               | 0          | 11         |
> | Kernel_panic-not_syncing:Fatal_exception | 0          | 11         |
> +------------------------------------------+------------+------------+
>
>
>
> [    4.347219] BUG: unable to handle kernel paging request at ffffffffff577060
> [    4.349770] IP: 0xf77e91ed
> [    4.351365] PGD 1e0c067
> [    4.351366] P4D 1e0c067
> [    4.352885] PUD 1e0e067
> [    4.354421] PMD 1e0f067
> [    4.355947] PTE 800000000be09161
> [    4.357457]
> [    4.360480] Oops: 0003 [#1] SMP
> [    4.362150] Modules linked in:
> [    4.363816] CPU: 0 PID: 1 Comm: init Not tainted 4.11.0-rc2-00014-g45fc875 #15
> [    4.367207] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [    4.371277] task: ffff88000b9a8000 task.stack: ffffc900000d0000
> [    4.373550] RIP: 0023:0xf77e91ed
> [    4.375284] RSP: 002b:00000000ffed034c EFLAGS: 00010246
> [    4.377409] RAX: 0000000000000063 RBX: 00000000f77edff0 RCX: 00000000ffed034c
> [    4.379996] RDX: 00000000f77e1690 RSI: 00000000f77ee094 RDI: 000000000000000c
> [    4.382588] RBP: 00000000ffed0368 R08: 0000000000000000 R09: 0000000000000000
> [    4.385136] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> [    4.387709] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> [    4.390289] FS:  0000000000000000(0000) GS:ffff88000be00000(0000) knlGS:0000000000000000
> [    4.393870] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
> [    4.396131] CR2: ffffffffff577060 CR3: 0000000019d08000 CR4: 00000000000006f0
> [    4.398696] RIP: 0xf77e91ed RSP: 00000000ffed034c
> [    4.400716] CR2: ffffffffff577060
> [    4.402425] ---[ end trace 35060e6ad8052d5b ]---
>
>
> To reproduce:
>
>         git clone https://github.com/01org/lkp-tests.git
>         cd lkp-tests
>         bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email
>
>
>
> Thanks,
> Kernel Test Robot


-- 
Thomas