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

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Date:   Fri, 15 Sep 2017 11:25:32 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.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

Dear Andy,


On 09/10/17 19:42, Andy Lutomirski wrote:
> On Sat, Sep 9, 2017 at 11:48 PM, Paul Menzel <pmenzel@...gen.mpg.de> wrote:

>> 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 am still seeing this with commit 711aab1dbb32 (vfs: constify path 
argument to kernel_read_file_from_path), which is the latest from Linus’ 
master branch.

```
[    0.004000] ------------[ cut here ]------------
[    0.004000] WARNING: CPU: 1 PID: 0 at arch/x86/mm/tlb.c:257 
initialize_tlbstate_and_flush+0x120/0x130
[    0.004000] Modules linked in:
[    0.004000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0+ #132
[    0.004000] Hardware name: LENOVO 636338U/636338U, BIOS CBET4000 
TIMELESS 01/01/1970
[    0.004000] task: f4113380 task.stack: f4118000
[    0.004000] EIP: initialize_tlbstate_and_flush+0x120/0x130
[    0.004000] EFLAGS: 00210006 CPU: 1
[    0.004000] EAX: 159bd000 EBX: d5892d00 ECX: d59c0000 EDX: 159c0000
[    0.004000] ESI: 00000000 EDI: 00000000 EBP: f4119f60 ESP: f4119f50
[    0.004000]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[    0.004000] CR0: 80050033 CR2: 00000000 CR3: 159bd000 CR4: 00000690
[    0.004000] Call Trace:
[    0.004000]  cpu_init+0xc3/0x260
[    0.004000]  start_secondary+0x33/0x1c0
[    0.004000]  startup_32_smp+0x164/0x166
[    0.004000] Code: 04 00 00 00 00 89 c8 50 9d 8d 74 26 00 83 c3 10 81 
fb 4c 50 9b d5 75 c9 58 5b 5e 5f 5d c3 90 8d 74 26 00 0f ff e9 3c ff ff 
ff 90 <0f> ff e9 13 ff ff ff 89 f6 8d bc 27 00 00 00 00 3e 8d 74 26 00
[    0.004000] ---[ end trace 17f2b31512589856 ]---
```


Kind regards,

Paul