Re: "BUG: kernel NULL pointer dereference," when unmounting filesystem hitted by enospc error

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On 25/10/2019 10:07, Johannes Thumshirn wrote:
> On 24/10/2019 22:23, Peter Hjalmarsson wrote:
>> Hi,
>>
>> Sorry for late answer. Have been out of town for work.
>> Interesting that you could not reproduce. What kind of system do you run?
> 
> I ran it up to 64 times but in a very minimal VM. Let me try to reprouce
> the issue on a bare metal system.
> 
>> I have tried on a couple of system now, and they behave slightly
>> different, so maybe it has something to do with which arch it runs
>> what kind of crash it triggers if any?
>> Also make sure that the "dd"-line in the script is not wrapped like it
>> became in the mail.
> 
> Yes I've fixed that up.
> 
>> For me running trough the test in a couple of systems, I found the following:
>>
>> The systems that always crashes did that during the first or the
>> second run of the script (so probably no need to run for longer than
>> maybe three to four times to verify).

Good news. I was able to reproduce this on bare metal and have a kdump core.





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Johannes Thumshirn                            SUSE Labs Filesystems
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