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Subject: Re: [BUG] btrfs potential failure on 32 core LTP test (fallocate05)
To:     Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Chris Mason <clm@fb.com>, David Sterba <dsterba@suse.com>,
        linux-btrfs@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "kernel-team@lists.ubuntu.com" <kernel-team@lists.ubuntu.com>,
        "ltp@lists.linux.it" <ltp@lists.linux.it>,
        Qu Wenruo <wqu@suse.com>, Filipe Manana <fdmanana@suse.com>
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From:   Josef Bacik <josef@toxicpanda.com>
Message-ID: <62d1df14-7ee5-8ff4-5676-cf98cdd966df@toxicpanda.com>
Date:   Tue, 29 Jun 2021 16:14:43 -0400
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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,

Josef