Date: Wed, 09 Dec 2015 10:47:52 -0500 From: "Michael B. Eichorn" <ike@michaeleichorn.com> To: Jan Bramkamp <crest@rlwinm.de>, freebsd-stable@freebsd.org Subject: Re: Periodic jobs triggering panics in 10.1 and 10.2 Message-ID: <1449676072.2727.8.camel@michaeleichorn.com> In-Reply-To: <56680148.9070601@rlwinm.de> References: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com> <1449619470.31831.9.camel@michaeleichorn.com> <56680148.9070601@rlwinm.de>
next in thread | previous in thread | raw e-mail | index | archive | help
--=-l6q25AVITlfYgqnSM+0J Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-12-09 at 11:24 +0100, Jan Bramkamp wrote: >=20 > On 09/12/15 01:04, Michael B. Eichorn wrote: > > On Tue, 2015-12-08 at 16:31 -0600, Dustin Wenz wrote: > > > I suspect this is a zfs bug that is triggered by the access > > > patterns > > > in the periodic scripts. There is significant load on the system > > > when > > > the scheduled processes start, because all jails execute the same > > > scripts at the same time. > > >=20 > > > I've been able to alleviate this problem by disabling the > > > security > > > scans within the jails, but leave it enabled on the root host. > >=20 > > To avoid the problem of jails all starting things at the same time, > > use > > the cron(8) flags -j and -J to set a 'jitter' which will cause cron > > to > > sleep for a random period of specified duration (60 sec max). Cron > > flags can be set using the rc.conf variable 'cron_flags'. >=20 > While jitter would reduce the resource contention a thundering herd > of=20 > cronjobs shouldn't cause the kernel to divide by zero. Spreading the=20 > load by introducing jitter to cronjobs might hide the problem, but it > still needs further analysis. I concur, used the word 'avoid' in the sense that this was an improvement to his work-around (which is all that I quoted). I had no intent to imply that it was the solution to the bug, which of course deserves solving. Sorry for any confusion, I will try to be more clear in the future. --=-l6q25AVITlfYgqnSM+0J Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEqAw ggYwMIIFGKADAgECAgMOXcYwDQYJKoZIhvcNAQELBQAwgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQK Ew1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVu dCBDQTAeFw0xNTA2MTMyMDI0NDZaFw0xNjA2MTQwMDM1NTBaMEgxHzAdBgNVBAMMFmlrZUBtaWNo YWVsZWljaG9ybi5jb20xJTAjBgkqhkiG9w0BCQEWFmlrZUBtaWNoYWVsZWljaG9ybi5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDJVdWALPz5h2s5zUQGIJYl6Vp8FPtZNko8q/3s crCsxXJLprMaDdpnqTsmkbmEfKvsqPQE6HVOpGxVRTl/tCm+VvouW9eY9ITMigb1OnHdU13CKO0j drgeU1nHst0qxwsIofRD7nC4dakT6exnrVndlBmLrf/bLPh2qOM8YK5qKK6m33fE7AyYrwiYAWFT 3fERI7LakjaabrIoS/Y1rCdL5FaCTMOlRbZyduc8HkrgjT2JW+i4fVcKyGL5gExBJWfS3q1uGFaB ie6pYtl8lZPtvN0JSfibP003RBoLgzqHJKW91RL0qNeDjKZi/5nrlU398l9UoVvLLO3KxoPBXKCx AgMBAAGjggLcMIIC2DAJBgNVHRMEAjAAMAsGA1UdDwQEAwIEsDAdBgNVHSUEFjAUBggrBgEFBQcD AgYIKwYBBQUHAwQwHQYDVR0OBBYEFJZqarc6CcrOs6eAwOgrMznk5ZWWMB8GA1UdIwQYMBaAFFNy 7ZKc4NrLAVx8fpY1TvLUuFGCMCEGA1UdEQQaMBiBFmlrZUBtaWNoYWVsZWljaG9ybi5jb20wggFM BgNVHSAEggFDMIIBPzCCATsGCysGAQQBgbU3AQIDMIIBKjAuBggrBgEFBQcCARYiaHR0cDovL3d3 dy5zdGFydHNzbC5jb20vcG9saWN5LnBkZjCB9wYIKwYBBQUHAgIwgeowJxYgU3RhcnRDb20gQ2Vy dGlmaWNhdGlvbiBBdXRob3JpdHkwAwIBARqBvlRoaXMgY2VydGlmaWNhdGUgd2FzIGlzc3VlZCBh Y2NvcmRpbmcgdG8gdGhlIENsYXNzIDEgVmFsaWRhdGlvbiByZXF1aXJlbWVudHMgb2YgdGhlIFN0 YXJ0Q29tIENBIHBvbGljeSwgcmVsaWFuY2Ugb25seSBmb3IgdGhlIGludGVuZGVkIHB1cnBvc2Ug aW4gY29tcGxpYW5jZSBvZiB0aGUgcmVseWluZyBwYXJ0eSBvYmxpZ2F0aW9ucy4wNgYDVR0fBC8w LTAroCmgJ4YlaHR0cDovL2NybC5zdGFydHNzbC5jb20vY3J0dTEtY3JsLmNybDCBjgYIKwYBBQUH AQEEgYEwfzA5BggrBgEFBQcwAYYtaHR0cDovL29jc3Auc3RhcnRzc2wuY29tL3N1Yi9jbGFzczEv Y2xpZW50L2NhMEIGCCsGAQUFBzAChjZodHRwOi8vYWlhLnN0YXJ0c3NsLmNvbS9jZXJ0cy9zdWIu Y2xhc3MxLmNsaWVudC5jYS5jcnQwIwYDVR0SBBwwGoYYaHR0cDovL3d3dy5zdGFydHNzbC5jb20v MA0GCSqGSIb3DQEBCwUAA4IBAQB4K8iQw+0FRn3xEnB3vIIu2Vi4C3ZGnOMWP90FFXLrZ6uAu9AK xVCjXUVP6nAEsOopTMu769vVecdBvg0KO2i5aTDTdTLX4g9d020g4OLWW1NiynAkX8oKqJLqZ53q vHK4zP4KWPS3bSqDWVCosTMfI+H6tkg+6G3gS0HHoHTLKZhIT3z6PQZAfeofM7ed6NOdAcj0J2lP ODHzzz7Y9x4wMwYJdidorzUDVYkNIkim8ak7hK9F60NadA5w/BirFATSlzRyV0h1tl6oNisEaQcq tGvy6UoCTDhzaJ7pQValfDXJ/A47P0hNj/CX/PmkY1wQHsEJz2pbh5lqteP/fO0rMIIGMDCCBRig AwIBAgIDDl3GMA0GCSqGSIb3DQEBCwUAMIGMMQswCQYDVQQGEwJJTDEWMBQGA1UEChMNU3RhcnRD b20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwgQ2VydGlmaWNhdGUgU2lnbmluZzE4MDYG A1UEAxMvU3RhcnRDb20gQ2xhc3MgMSBQcmltYXJ5IEludGVybWVkaWF0ZSBDbGllbnQgQ0EwHhcN MTUwNjEzMjAyNDQ2WhcNMTYwNjE0MDAzNTUwWjBIMR8wHQYDVQQDDBZpa2VAbWljaGFlbGVpY2hv cm4uY29tMSUwIwYJKoZIhvcNAQkBFhZpa2VAbWljaGFlbGVpY2hvcm4uY29tMIIBIjANBgkqhkiG 9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyVXVgCz8+YdrOc1EBiCWJelafBT7WTZKPKv97HKwrMVyS6az Gg3aZ6k7JpG5hHyr7Kj0BOh1TqRsVUU5f7Qpvlb6LlvXmPSEzIoG9Tpx3VNdwijtI3a4HlNZx7Ld KscLCKH0Q+5wuHWpE+nsZ61Z3ZQZi63/2yz4dqjjPGCuaiiupt93xOwMmK8ImAFhU93xESOy2pI2 mm6yKEv2NawnS+RWgkzDpUW2cnbnPB5K4I09iVvouH1XCshi+YBMQSVn0t6tbhhWgYnuqWLZfJWT 7bzdCUn4mz9NN0QaC4M6hySlvdUS9KjXg4ymYv+Z65VN/fJfVKFbyyztysaDwVygsQIDAQABo4IC 3DCCAtgwCQYDVR0TBAIwADALBgNVHQ8EBAMCBLAwHQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUF BwMEMB0GA1UdDgQWBBSWamq3OgnKzrOngMDoKzM55OWVljAfBgNVHSMEGDAWgBRTcu2SnODaywFc fH6WNU7y1LhRgjAhBgNVHREEGjAYgRZpa2VAbWljaGFlbGVpY2hvcm4uY29tMIIBTAYDVR0gBIIB QzCCAT8wggE7BgsrBgEEAYG1NwECAzCCASowLgYIKwYBBQUHAgEWImh0dHA6Ly93d3cuc3RhcnRz c2wuY29tL3BvbGljeS5wZGYwgfcGCCsGAQUFBwICMIHqMCcWIFN0YXJ0Q29tIENlcnRpZmljYXRp b24gQXV0aG9yaXR5MAMCAQEagb5UaGlzIGNlcnRpZmljYXRlIHdhcyBpc3N1ZWQgYWNjb3JkaW5n IHRvIHRoZSBDbGFzcyAxIFZhbGlkYXRpb24gcmVxdWlyZW1lbnRzIG9mIHRoZSBTdGFydENvbSBD QSBwb2xpY3ksIHJlbGlhbmNlIG9ubHkgZm9yIHRoZSBpbnRlbmRlZCBwdXJwb3NlIGluIGNvbXBs aWFuY2Ugb2YgdGhlIHJlbHlpbmcgcGFydHkgb2JsaWdhdGlvbnMuMDYGA1UdHwQvMC0wK6ApoCeG JWh0dHA6Ly9jcmwuc3RhcnRzc2wuY29tL2NydHUxLWNybC5jcmwwgY4GCCsGAQUFBwEBBIGBMH8w OQYIKwYBBQUHMAGGLWh0dHA6Ly9vY3NwLnN0YXJ0c3NsLmNvbS9zdWIvY2xhc3MxL2NsaWVudC9j YTBCBggrBgEFBQcwAoY2aHR0cDovL2FpYS5zdGFydHNzbC5jb20vY2VydHMvc3ViLmNsYXNzMS5j bGllbnQuY2EuY3J0MCMGA1UdEgQcMBqGGGh0dHA6Ly93d3cuc3RhcnRzc2wuY29tLzANBgkqhkiG 9w0BAQsFAAOCAQEAeCvIkMPtBUZ98RJwd7yCLtlYuAt2RpzjFj/dBRVy62ergLvQCsVQo11FT+pw BLDqKUzLu+vb1XnHQb4NCjtouWkw03Uy1+IPXdNtIODi1ltTYspwJF/KCqiS6med6rxyuMz+Clj0 t20qg1lQqLEzHyPh+rZIPuht4EtBx6B0yymYSE98+j0GQH3qHzO3nejTnQHI9CdpTzgx888+2Pce MDMGCXYnaK81A1WJDSJIpvGpO4SvRetDWnQOcPwYqxQE0pc0cldIdbZeqDYrBGkHKrRr8ulKAkw4 c2ie6UFWpXw1yfwOOz9ITY/wl/z5pGNcEB7BCc9qW4eZarXj/3ztKzCCBjQwggQcoAMCAQICAR4w DQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKzAp BgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAnBgNVBAMTIFN0YXJ0 Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoXDTE3MTAyNDIxMDE1 NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1 cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAx IFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK75xCGhR8ToREoqe7 zM9/UnC6TS2y9UKTpT1v7RSMzR0t6ndl0TWBuUr/UXBhPk+Kmy7bI4yW4urC+y7P3/1/X7U8ocb8 VpH/Clt+4iq7nirMcNh6qJR+xjOhV+VHzQMALuGYn5KZmc1NbJQYclsGkDxDz2UbFqE2+6vIZoL+ jb9x4Pa5gNf1TwSDkOkikZB1xtB4ZqtXThaABSONdfmv/Z1pua3FYxnCFmdr/+N2JLKutIxMYqQO Jebr/f/h5t95m4JgrM3Y/w7YX9d7YAL9jvN4SydHsU6n65cCAwEAAaOCAa0wggGpMA8GA1UdEwEB /wQFMAMBAf8wDgYDVR0PAQH/BAQDAgEGMB0GA1UdDgQWBBRTcu2SnODaywFcfH6WNU7y1LhRgjAf BgNVHSMEGDAWgBROC+8apEBbpRdphzDKNGhD0EGu8jBmBggrBgEFBQcBAQRaMFgwJwYIKwYBBQUH MAGGG2h0dHA6Ly9vY3NwLnN0YXJ0c3NsLmNvbS9jYTAtBggrBgEFBQcwAoYhaHR0cDovL3d3dy5z dGFydHNzbC5jb20vc2ZzY2EuY3J0MFsGA1UdHwRUMFIwJ6AloCOGIWh0dHA6Ly93d3cuc3RhcnRz c2wuY29tL3Nmc2NhLmNybDAnoCWgI4YhaHR0cDovL2NybC5zdGFydHNzbC5jb20vc2ZzY2EuY3Js MIGABgNVHSAEeTB3MHUGCysGAQQBgbU3AQIBMGYwLgYIKwYBBQUHAgEWImh0dHA6Ly93d3cuc3Rh cnRzc2wuY29tL3BvbGljeS5wZGYwNAYIKwYBBQUHAgEWKGh0dHA6Ly93d3cuc3RhcnRzc2wuY29t L2ludGVybWVkaWF0ZS5wZGYwDQYJKoZIhvcNAQEFBQADggIBAAqDCH14qywGXLhjjF6uHLkjd02h cdh9hrw+VUsv+q1eeQWB21jWj3kJ96AUlPCoEGZ/ynJNScWy6QMVQjbbMXltUfO4n4bGGdKo3awP Wp61tjAFgraLJgDk+DsSvUD6EowjMTNx25GQgyYJ5RPIzKKR9tQW8gGK+2+RHxkUCTbYFnL6kl8C h507rUdPPipJ9CgJFws3kDS3gOS5WFMxcjO5DwKfKSETEPrHh7p5shuuNktvsv6hxHTLhiMKX893 gxdT3XLS9OKmCv87vkINQcNEcIIoFWbP9HORz9v3vQwR4e3ksLc2JZOAFK+ssS5XMEoznzpihEP0 PLc4dCBYjbvSD7kxgDwZ+Aj8Q9PkbvE9sIPP7ON0fz095HdThKjiVJe6vofq+n6b1NBc8XdrQvBm unwxD5nvtTW4vtN6VY7mUCmxsCieuoBJ9OlqmsVWQvifIYf40dJPZkk9YgGTzWLpXDSfLSplbY2L L9C9U0ptvjcDjefLTvqSFc7tw1sEhF0n/qpA2r0GpvkLRDmcSwVyPvmjFBGqUp/pNy8ZuPGQmHwF i2/14+xeSUDG2bwnsYJQG2EdJCB6luQ57GEnTA/yKZSTKI8dDQa8Sd3zfXb19mOgSF0bBdXbuKhE puP9wirslFe6fQ1t5j5R0xi72MZ8ikMu1RQZKCyDbMwazlHiMYIDfzCCA3sCAQEwgZQwgYwxCzAJ BgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRh bCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkg SW50ZXJtZWRpYXRlIENsaWVudCBDQQIDDl3GMA0GCWCGSAFlAwQCAQUAoIIBuzAYBgkqhkiG9w0B CQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNTEyMDkxNTQ3NTJaMC8GCSqGSIb3DQEJ BDEiBCDcQtO3hVcttx1g0QSgJTbuw8+bj9cR+15RgLhe5ps35jCBpQYJKwYBBAGCNxAEMYGXMIGU MIGMMQswCQYDVQQGEwJJTDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJl IERpZ2l0YWwgQ2VydGlmaWNhdGUgU2lnbmluZzE4MDYGA1UEAxMvU3RhcnRDb20gQ2xhc3MgMSBQ cmltYXJ5IEludGVybWVkaWF0ZSBDbGllbnQgQ0ECAw5dxjCBpwYLKoZIhvcNAQkQAgsxgZeggZQw gYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUg RGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFBy aW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQQIDDl3GMA0GCSqGSIb3DQEBAQUABIIBABBJW8Su apsIUoLPip9w5fRLlwnURPOYDMk0sq/+LRKnucR8yBwfWkbjpLqX0bxVLpzPdM9rwhZ7QG+eRBNv t4Dhbcb5YEWE+wfionLn2JYnSGClJqIsKHLkM6s4kMhEb21Rn3blGLYeoaPQcBWZ49+PAyOKEgvh tqFtGom5T0+z0DgNtG96ts8jvIMFIEL7SLDkkZvV5IY+5wOz1TZov4LMtKY7CqszHCv6KqTS0IFv 0bYJGhW3Xhvg0s39SJvaB5d+lRFj6l8sIttQvBmUbYN3d2kq5sKSchynjFDUTe3o6BzKTgwtBRrd 5MKKL+vfmAfEQLT8ND9WjsRwELgB0B8AAAAAAAA= --=-l6q25AVITlfYgqnSM+0J--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1449676072.2727.8.camel>