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[79.211.174.240]) by smtp.gmail.com with ESMTPSA id f12sm6657971wmj.10.2020.02.08.01.57.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 08 Feb 2020 01:57:01 -0800 (PST) Sender: Gordon Bergling Date: Sat, 8 Feb 2020 10:56:58 +0100 From: Gordon Bergling To: freebsd-current@freebsd.org Subject: KCSAN error messages and system hang Message-ID: <20200208095658.GA789@lion.0xfce3.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Url: X-Operating-System: FreeBSD 12.1-STABLE amd64 X-Host-Uptime: 10:46AM up 19:29, 2 users, load averages: 4.28, 4.05, 3.67 X-Rspamd-Queue-Id: 48F6yn0r6sz4fJr X-Spamd-Bar: / X-Spamd-Result: default: False [-0.70 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_FROM(0.00)[googlemail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; FORGED_SENDER(0.30)[gbergling@googlemail.com,gbergling@gmail.com]; RECEIVED_SPAMHAUS_PBL(0.00)[240.174.211.79.khpj7ygk5idzvmvt5x4ziurxhy.zen.dq.spamhaus.net : 127.0.0.10]; IP_SCORE(0.00)[ip: (-9.16), ipnet: 2a00:1450::/32(-2.49), asn: 15169(-1.74), country: US(-0.05)]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[gbergling@googlemail.com,gbergling@gmail.com]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; DMARC_POLICY_QUARANTINE(1.50)[googlemail.com : SPF not aligned (relaxed), DKIM not aligned (relaxed),quarantine]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; IP_SCORE_FREEMAIL(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; RCVD_IN_DNSWL_NONE(0.00)[2.3.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 08 Feb 2020 09:57:06 -0000 Greetings, I recently experimented with a KCSAN enabled kernel on -CURRENT and got the following error messages. CSan: Racy Access [Cpu0 Write Addr=0xfffffe000297f0c8 Size=4 PC=0xffffffff8116a31a] [Cpu1 Read Addr=0xfffffe000297f0c8 Size=4 PC=0xffffffff8116b3b8] CSan: Racy Access [Cpu0 Read Addr=0xffffffff82314e10 Size=8 PC=0xffffffff8113a66c] [Cpu1 Write Addr=0xffffffff82314e10 Size=8 PC=0xffffffff8113c3a8] CSan: Racy Access [Cpu0 Write Addr=0xfffff8003eb646e8 Size=8 PC=0xffffffff811cd358] [Cpu1 Write Addr=0xfffff8003eb646e8 Size=8 PC=0xffffffff811cd358] CSan: Racy Access [Cpu0 Write Addr=0xffffffff831fd0dc Size=1 PC=0xffffffff81169f38] [Cpu1 Read Addr=0xffffffff831fd0dc Size=1 PC=0xffffffff811672f8] CSan: Racy Access [Cpu0 Write Addr=0xffffffff831fd0dc Size=1 PC=0xffffffff81169f38] [Cpu1 Read Addr=0xffffffff831fd0dc Size=1 PC=0xffffffff8116512c] CSan: Racy Access [Cpu1 Write Addr=0xfffffe0015897400 Size=8 PC=0xffffffff82bf5877] [Cpu0 Read Addr=0xfffffe0015897400 Size=8 PC=0xffffffff82bf545c] CSan: Racy Access [Cpu1 Write Addr=0xfffff800fee000b0 Size=4 PC=0xffffffff819574b0] [Cpu0 Write Addr=0xfffff800fee000b0 Size=4 PC=0xffffffff819574b0] CSan: Racy Access [Cpu0 Write Addr=0xfffff800fee00320 Size=4 PC=0xffffffff81959f1a] [Cpu1 Write Addr=0xfffff800fee00320 Size=4 PC=0xffffffff81959f1a] CSan: Racy Access [Cpu1 Write Addr=0xfffff8000bb268c4 Size=4 PC=0xffffffff8168f96b] [Cpu0 Read Addr=0xfffff8000bb268c4 Size=4 PC=0xffffffff8166f847] CSan: Racy Access [Cpu0 Read Addr=0xffffffff831fd0c8 Size=4 PC=0xffffffff81169e81] [Cpu1 Write Addr=0xffffffff831fd0c8 Size=4 PC=0xffffffff8116a31a] CSan: Racy Access [Cpu1 Write Addr=0xfffff800fee00320 Size=4 PC=0xffffffff81959f1a] [Cpu0 Write Addr=0xfffff800fee00320 Size=4 PC=0xffffffff81959f1a] CSan: Racy Access [Cpu0 Write Addr=0xffffffff831fd0c8 Size=4 PC=0xffffffff81167b4e] [Cpu1 Read Addr=0xffffffff831fd0c8 Size=4 PC=0xffffffff811654de] These messages appeared during boot. Any hints on debugging this further? I am not sure on how to find the corresponding code that leads to this error messages. Another problem with the KCSAN configuration is that the system reproducibly hangs after a few minutes. Any hints how to debug a hang where also much appreciated. Best regards, Gordon