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([2605:e000:100e:8c61:8495:a173:67ea:559c]) by smtp.gmail.com with ESMTPSA id k5sm3977905pju.29.2020.02.20.08.39.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Feb 2020 08:39:00 -0800 (PST) Subject: Re: crash on connect To: Glauber Costa Cc: io-uring@vger.kernel.org, Avi Kivity References: <5e4904d5-e7fc-c079-e112-5b978c8fa129@kernel.dk> <7fa66eac-73d0-c461-98dd-2818434e8bc8@kernel.dk> From: Jens Axboe Message-ID: Date: Thu, 20 Feb 2020 08:38:59 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 2/20/20 9:34 AM, Glauber Costa wrote: > On Thu, Feb 20, 2020 at 11:29 AM Jens Axboe wrote: >> >> On 2/20/20 9:17 AM, Jens Axboe wrote: >>> On 2/20/20 7:19 AM, Glauber Costa wrote: >>>> Hi there, me again >>>> >>>> Kernel is at 043f0b67f2ab8d1af418056bc0cc6f0623d31347 >>>> >>>> This test is easier to explain: it essentially issues a connect and a >>>> shutdown right away. >>>> >>>> It currently fails due to no fault of io_uring. But every now and then >>>> it crashes (you may have to run more than once to get it to crash) >>>> >>>> Instructions are similar to my last test. >>>> Except the test to build is now "tests/unit/connect_test" >>>> Code is at git@github.com:glommer/seastar.git branch io-uring-connect-crash >>>> >>>> Run it with ./build/release/tests/unit/connect_test -- -c1 >>>> --reactor-backend=uring >>>> >>>> Backtrace attached >>> >>> Perfect thanks, I'll take a look! >> >> Haven't managed to crash it yet, but every run complains: >> >> got to shutdown of 10 with refcnt: 2 >> Refs being all dropped, calling forget for 10 >> terminate called after throwing an instance of 'fmt::v6::format_error' >> what(): argument index out of range >> unknown location(0): fatal error: in "unixdomain_server": signal: SIGABRT (application abort requested) >> >> Not sure if that's causing it not to fail here. > > Ok, that means it "passed". (I was in the process of figuring out > where I got this wrong when I started seeing the crashes) Can you do, in your kernel dir: $ gdb vmlinux [...] (gdb) l *__io_queue_sqe+0x4a and see what it says? -- Jens Axboe