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([2620:10d:c091:480::1:98e8]) by smtp.gmail.com with ESMTPSA id d136sm4242135qkc.110.2021.06.29.11.32.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Jun 2021 11:32:17 -0700 (PDT) Subject: Re: [BUG] btrfs potential failure on 32 core LTP test (fallocate05) To: Krzysztof Kozlowski , Chris Mason , David Sterba , linux-btrfs@vger.kernel.org, Linux Kernel Mailing List , "kernel-team@lists.ubuntu.com" , "ltp@lists.linux.it" , Qu Wenruo , Filipe Manana References: <124d7ead-6600-f369-7af1-a1bc27df135c@toxicpanda.com> <667133e5-44cb-8d95-c40a-12ac82f186f0@canonical.com> <0b6a502a-8db8-ef27-f48e-5001f351ef24@toxicpanda.com> <2576a472-1c99-889a-685c-a12bbfb08052@canonical.com> <9e2214b1-999d-90cf-a5c2-2dbb5a2eadd4@canonical.com> From: Josef Bacik Message-ID: <57cfa398-8a33-06e2-dfcd-fa959c27ac47@toxicpanda.com> Date: Tue, 29 Jun 2021 14:32:15 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <9e2214b1-999d-90cf-a5c2-2dbb5a2eadd4@canonical.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? Ah yeah, so since you are further into this than I am, want to give my recent batch of fixes a try? https://github.com/josefbacik/linux/tree/delalloc-shrink This might actually resolve the problems. If not I'm getting one of our 64cpu boxes setup to test this, I also couldn't reproduce it on my smaller local machines. Thanks, Josef