Re: [Xen-devel] Xen-unstable + linux 5.4.0-rc8: RIP: 0010:xennet_poll+0x35f/0xae0

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

On 25/11/2019 15:42, Jan Beulich wrote:
> On 25.11.2019 15:21, Sander Eikelenboom wrote:
>> L.S.,
>>
>> At present one of my PVH VM's kernel crashed with the splat below
>> (haven't seen it before, so could be something that happens sporadically).
>>
>> Any ideas ?
>>
>> --
>> Sander
>>
>>
>>
>> database databaselogin:  login: [184503.428811] general protection fault: 
>> 0000 [#1] SMP NOPTI
>> [184503.428887] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 
>> 5.4.0-rc8-20191123-doflr-mac80211debug+ #1
>> [184503.428932] RIP: 0010:xennet_poll+0x35f/0xae0
>> [184503.428955] Code: ba 00 01 00 00 48 8b 8d c0 00 00 00 0f b7 b4 24 92 00 
>> 00 00 48 8b 5c 24 78 3d 00 01 00 00 0f 4e d0 89 55 28 8b 95 bc 00 00 00 <89> 
>> 74 11 3c 48 8b 8d c0 00 00 00 8b 95 bc 00 00 00 89 44 11 38 89
> 
> The insn here being "mov     %esi,(%rcx,%rdx,0x3c)" ...
> 
>> [184503.429027] RSP: 0018:ffffc90000003e10 EFLAGS: 00010287
>> [184503.429049] RAX: 0000000000000042 RBX: ffffc90000003e88 RCX: 
>> fffe88800b865a80
> 
> ... I notice corruption to bit 48 of RCX here. This can be a result of
> memory corruption, but prior instances of such that I had to look into
> were bit flips in the CPU instead. Is this a server or desktop class
> CPU?
> 
> Jan

Hi Jan,

Fortunately (or more unfortunate for me), memtest86 gave errors on one
stick of memory. So this is the probable cause.

Sorry for the noise.

--
Sander


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