linux-kernel - Re: WARNING: CPU: 1 PID: 0 at arch/x86/mm/tlb.c:237 initialize_tlbstate_and

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Date:   Thu, 14 Sep 2017 09:47:56 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Voegtle <tv@...96.de>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Paul Menzel <pmenzel@...gen.mpg.de>, X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: CPU: 1 PID: 0 at arch/x86/mm/tlb.c:237 initialize_tlbstate_and_flush+0x120/0x130

On Wed, Sep 13, 2017 at 5:59 AM, Thomas Voegtle <tv@...96.de> wrote:
> On Sun, 10 Sep 2017, Andy Lutomirski wrote:
>
>> On Sat, Sep 9, 2017 at 11:48 PM, Paul Menzel <pmenzel@...gen.mpg.de>
>> wrote:
>>>
>>> Dear Linux folks,
>>>
>>>
>>> With Linux built from commit 4dfc2788033d (Merge tag
>>> 'iommu-updates-v4.14'
>>> of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu), I get the
>>> warning below on a Lenovo X60t with a 32-bit CPU.
>>
>>
>> Indeed.  I sent a patch this morning.  The warning is harmless -- the
>> warning condition has a typo.
>
>
>
> I get that warning (4 times) with that typo fix:
>
>
>
> [    0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/mm/tlb.c:245
> initialize_tlbstate_and_flush+0x6e/0xf0
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
> 4.13.0-i5-11559-g6d8ef53e8b2f #176
> [    0.000000] Hardware name: BIOSTAR Group H81MG/H81MG, BIOS 4.6.5
> 06/27/2014
> [    0.000000] task: ffffffff8680e480 task.stack: ffffffff86800000
> [    0.000000] RIP: 0010:initialize_tlbstate_and_flush+0x6e/0xf0
> [    0.000000] RSP: 0000:ffffffff86803e60 EFLAGS: 00010046
> [    0.000000] RAX: ffffffff8682c1c0 RBX: 0000000000000000 RCX:
> 0000000062809000
> [    0.000000] RDX: 00000000000406b0 RSI: 0000000006809000 RDI:
> 0000000000000000
> [    0.000000] RBP: ffffffff86803e60 R08: 0000000062809000 R09:
> ffffffff8697b800
> [    0.000000] R10: 0000ffffffffffff R11: ffffffff0000ffff R12:
> ffff8d7b00a16380
> [    0.000000] R13: 0000000000000000 R14: ffff8d7b00a0c3a0 R15:
> ffffffff8680e480
> [    0.000000] FS:  0000000000000000(0000) GS:ffff8d7b00a00000(0000)
> knlGS:0000000000000000
> [    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.000000] CR2: ffff8d7b00dff000 CR3: 0000000062809000 CR4:
> 00000000000406b0
> [    0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [    0.000000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [    0.000000] Call Trace:
> [    0.000000]  cpu_init+0x1bd/0x4a0
> [    0.000000]  trap_init+0x3e/0x50
> [    0.000000]  start_kernel+0x2ad/0x3fc
> [    0.000000]  ? set_init_arg+0x55/0x55
> [    0.000000]  x86_64_start_reservations+0x24/0x26
> [    0.000000]  x86_64_start_kernel+0x6f/0x72
> [    0.000000]  secondary_startup_64+0xa5/0xa5
> [    0.000000] Code: 48 01 f2 49 39 d0 0f 85 94 00 00 00 48 8b 15 be f6 84
> 00 f7 c2 00 00 02 00 74 12 65 48 8b 15 7a c7 fd 79 f7 c2 00 00 02 00 75 02
> <0f> ff 48 81 e1 00 f0 ff ff 0f 22 d9 65 66 c7 05 54 c7 fd 79 00
>
>
> What's wrong here?
>

Try Linus' tree now -- it should be fixed.