linux-kernel - Re: [BUG] btrfs potential failure on 32 core LTP test (fallocate05)

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Message-ID: <85f1469f-0fad-6339-7d75-c9310322ae77@canonical.com>
Date:   Wed, 30 Jun 2021 08:52:23 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Josef Bacik <josef@...icpanda.com>, Chris Mason <clm@...com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "kernel-team@...ts.ubuntu.com" <kernel-team@...ts.ubuntu.com>,
        "ltp@...ts.linux.it" <ltp@...ts.linux.it>,
        Qu Wenruo <wqu@...e.com>, Filipe Manana <fdmanana@...e.com>
Subject: Re: [BUG] btrfs potential failure on 32 core LTP test (fallocate05)

On 29/06/2021 22:14, Josef Bacik wrote:
> On 6/29/21 2:28 PM, Krzysztof Kozlowski wrote:
>> On 29/06/2021 20:06, Krzysztof Kozlowski wrote:
>>> Minor update - it's not only Azure's. AWS m5.8xlarge and m5.16xlarge (32
>>> and 64 cores) fail similarly. I'll try later also QEMU machines with
>>> different amount of CPUs.
>>>
>>
>> Test on QEMU machine with 31 CPUs passes. With 32 CPUs - failure as
>> reported.
>>
>> dmesg is empty - no error around this.
>>
>> Maybe something with per-cpu variables?
>>
> 
> Can I get y'alls .config?  I ran it on one of my 80cpu boxes and it didn't 
> reproduce on my new code or on 5.12.  Thanks,

Here is one for v5.13.

Best regards,
Krzysztof

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