From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
To: rrs@researchut.com, linux-um@lists.infradead.org
Subject: Re: uml segfault during I/O
Date: Thu, 17 Oct 2019 16:03:17 +0100 [thread overview]
Message-ID: <c7135e15-d2e4-3bce-9584-9032ddca72fe@cambridgegreys.com> (raw)
In-Reply-To: <cf1294b2-e1cc-961c-e8e1-d070fe0ea94d@cambridgegreys.com>
On 17/10/2019 14:33, Anton Ivanov wrote:
>
>
> On 17/10/2019 14:30, Ritesh Raj Sarraf wrote:
>> On Thu, 2019-10-17 at 14:02 +0100, Anton Ivanov wrote:
>>> Looking into that. I have not run into anything like that, but I have
>>> not used any of the legacy networking for 5 odd years now.
>>>
>>
>> Do you think this is related to networking ? I ask because there was no
>> network activity going on.
>
> no, it's disk somewhere. I managed to reproduce it with 5.2 stock on
> Debian 5.2 host.
>
>>
>> apt is just an example. The packages were all already downloaded and
>> there was no network activity. Rather, there was block I/O.
>
> I am looking into that.
>
>>
>> One thing I noticed, which may or may not be useful to this report. I
>> was booting the uml guest and immediately logging into it and running
>> the block I/O. And the segfault would occur.
>>
>> If I, instead, booted the uml vm and let it remain idle for a minute or
>> so and then did the I/O, it worked fine. So I am not sure if there is
>> any lazy initialization happening in the background which gets
>> corrupted during immediate hot boot I/O.
>
> Interesting...
>
>>
>> On the other hand, if you think there can be any number of commands to
>> run locally that could generate more information, please assist me so.
>
> As I said - I managed to reproduce it, I am looking at it. In first
> instance I am trying with a couple of version up/down to see if this is
> 5.2 specific.
I cannot even get it to start on 5.4-rc1, 5.3 shows the same symptoms.
>
>>
>> Thanks,
>> Ritesh
>>
>>
>> _______________________________________________
>> linux-um mailing list
>> linux-um@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-um
>>
>
--
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/
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next prev parent reply other threads:[~2019-10-17 15:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 11:37 uml segfault during I/O Ritesh Raj Sarraf
[not found] ` <1ccf27d8-6b6a-7d08-acef-93077f07511b@cambridgegreys.com>
2019-10-17 13:30 ` Ritesh Raj Sarraf
2019-10-17 13:33 ` Anton Ivanov
2019-10-17 15:03 ` Anton Ivanov [this message]
2019-10-17 16:29 ` Anton Ivanov
2019-10-18 7:35 ` Anton Ivanov
2019-10-18 8:57 ` Johannes Berg
2019-10-18 9:13 ` Anton Ivanov
2019-10-18 9:49 ` Anton Ivanov
2019-10-18 9:55 ` Anton Ivanov
2019-10-18 10:51 ` Anton Ivanov
2019-10-28 16:51 ` Anton Ivanov
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