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[2603:8081:1405:679b:dc02:5dd1:9c21:a1b6]) by smtp.gmail.com with ESMTPSA id tz4-20020a0568714a0400b001d666a1c076sm5917258oab.29.2023.09.20.10.18.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Sep 2023 10:18:47 -0700 (PDT) Message-ID: Date: Wed, 20 Sep 2023 12:18:46 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [bug report] blktests srp/002 hang Content-Language: en-US To: Bart Van Assche , Zhu Yanjun , Shinichiro Kawasaki Cc: "linux-rdma@vger.kernel.org" , "linux-scsi@vger.kernel.org" References: <0c5c732c-283c-b29a-0ac2-c32211fc7e17@gmail.com> <8be8f611-e413-9584-7c2e-2c1abf4147be@acm.org> <18a3ae8c-145b-4c7f-a8f5-67840feeb98c@acm.org> <9dd0aa0a-d696-a95b-095b-f54d6d31a6ab@linux.dev> <5a4efe6f-d8c6-84ce-377e-eb64bcad706c@linux.dev> <6fc3b524-af7d-43ce-aa05-5c44ec850b9b@acm.org> From: Bob Pearson In-Reply-To: <6fc3b524-af7d-43ce-aa05-5c44ec850b9b@acm.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On 9/20/23 11:36, Bart Van Assche wrote: > On 9/20/23 09:24, Bob Pearson wrote: >> The verbs APIs do not make real time commitments. If a ULP fails because of response times it is the problem in the ULP not in the verbs provider. > > I think there is evidence that the root cause is in the RXE driver. I > haven't seen any evidence that there would be any issues in any of the > involved ULP drivers. Am I perhaps missing something? > > Bart. I agree it is definitely possible. But I have also seen the same behavior in the siw driver which is completely independent. I have tried but have not been able to figure out what the ULPs are waiting for when the hangs occur. If someone who has a good understanding of the ULPs could catch a hang and figure what is missing it would give a clue as to what is going on. As mentioned above at the moment Ubuntu is failing rarely. But it used to fail reliably (srp/002 about 75% of the time and srp/011 about 99% of the time.) There haven't been any changes to rxe to explain this. Bob