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Thu, 21 May 2020 01:04:17 +0000 Received: from QB1PR01MB3649.CANPRD01.PROD.OUTLOOK.COM ([fe80::dd96:945c:b6ee:ffa2]) by QB1PR01MB3649.CANPRD01.PROD.OUTLOOK.COM ([fe80::dd96:945c:b6ee:ffa2%6]) with mapi id 15.20.3000.034; Thu, 21 May 2020 01:04:17 +0000 From: Rick Macklem To: "freebsd-current@FreeBSD.org" CC: Konstantin Belousov , "rlibby@freebsd.org" Subject: r358252 causes intermittent hangs where processes are stuck sleeping on btalloc Thread-Topic: r358252 causes intermittent hangs where processes are stuck sleeping on btalloc Thread-Index: AQHWLwsKoH8lF1xuI0WPckyCNZ/JGQ== Date: Thu, 21 May 2020 01:04:16 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7211535c-1627-4fb0-6ebd-08d7fd22e2b3 x-ms-traffictypediagnostic: QB1PR01MB3955: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 041032FF37 x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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TO_DN_EQ_ADDR_SOME(0.00)[]; NEURAL_HAM_MEDIUM(-0.98)[-0.980]; R_DKIM_ALLOW(-0.20)[uoguelph.ca:s=selector1]; RWL_MAILSPIKE_POSSIBLE(0.00)[40.107.67.41:from]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; R_SPF_ALLOW(-0.20)[+ip4:40.107.0.0/16]; DMARC_NA(0.00)[uoguelph.ca]; DWL_DNSWL_LOW(-1.00)[uoguelph.ca:dkim]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[uoguelph.ca:+]; NEURAL_HAM_SHORT(-1.53)[-1.530]; NEURAL_HAM_LONG(-1.04)[-1.035]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:8075, ipnet:40.64.0.0/10, country:US]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1]; RCVD_IN_DNSWL_LOW(-0.10)[40.107.67.41:from] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.33 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: Thu, 21 May 2020 01:04:23 -0000 Hi,=0A= =0A= Since I hadn't upgraded a kernel through the winter, it took me a while=0A= to bisect this, but r358252 seems to be the culprit.=0A= =0A= If I do a kernel build over NFS using my not so big Pentium 4 (single core,= =0A= 1.25Gbytes RAM, i386), about every second attempt will hang.=0A= When I do a "ps" in the debugger, I see processes sleeping on btalloc.=0A= If I revert to r358251, I cannot reproduce this.=0A= =0A= Any ideas?=0A= =0A= I can easily test any change you might suggest to see if it fixes the=0A= problem.=0A= =0A= If you want more debug info, let me know, since I can easily=0A= reproduce it.=0A= =0A= Thanks, rick=0A=