Re: generic/650 makes v6.0-rc client unusable

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Hi-

> On Sep 4, 2022, at 9:15 AM, Zorro Lang <zlang@xxxxxxxxxx> wrote:
> 
> On Sat, Sep 03, 2022 at 06:43:29PM +0000, Chuck Lever III wrote:
>> While investigating some of the other issues that have been
>> reported lately, I've found that my v6.0-rc3 NFS/TCP client
>> goes off the rails often (but not always) during generic/650.
>> 
>> This is the test that runs a workload while offlining and
>> onlining CPUs. My test client has 12 physical cores.
>> 
>> The test appears to start normally, but then after a bit
>> the NFS server workload drops to zero and the NFS mount
>> disappears. I can't run programs (sudo, for example) on
>> the client. Can't log in, even on the console. The console
>> has a constant stream of "can't rotate log: Input/Output
>> error" type messages.
>> 
>> I haven't looked further into this yet. Actually I'm not
>> quite sure where to start looking.
>> 
>> I recently switched this client from a local /home to an
>> NFS-mounted one, and that's where the xfstests are built
>> and run from, fwiw.
> 
> If most of users complain generic/650, I'd like to exclude g/650 from the
> "auto" default run group. Any more points?

Well generic/650 was passing for me before v6.0-rc, and IMO
it is a tough but reasonable test, considering the ubiquitous
use of workqueues and other scheduling primitives in our
filesystems.

So I think I caught a real bug, but I need a couple more days
to work it out before deciding generic/650 is throwing false
negatives and is thus not worth running in the "auto" group.

I can't really say whether Ted's failing tests are the
result of an interaction with the GCE platform or the test
itself. Ie, his patch might be the right approach -- exclude
it based on the test platform.


--
Chuck Lever







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