Date: Tue, 12 Jul 2016 09:29:46 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: Not-so stable if you take a CAM error.... Message-ID: <c7baaa84-71a6-e535-2621-5aab14032598@denninger.net> In-Reply-To: <447fcrdjgj.fsf@lowell-desk.lan> References: <2b0c454b-c1a0-4b5b-e778-bf0939e90ae1@denninger.net> <op.ykfe1fvbkndu52@ronaldradial.radialsg.local> <6e9c07e1-12a6-a7cd-f775-6b0fe5a706bc@denninger.net> <1468243977.72182.118.camel@freebsd.org> <877f5e8e-c1e7-6fb0-6ceb-031ce3e68582@denninger.net> <CAKFCL4WrRS1ic1CZqcmbCEnsrD2pkh4VHPBFyB%2B-3NaNJZ%2BJkw@mail.gmail.com> <1468254746.72182.121.camel@freebsd.org> <f22ab40d-42f0-78a3-d3a7-945387259109@denninger.net> <447fcrdjgj.fsf@lowell-desk.lan>
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This is a cryptographically signed message in MIME format. --------------ms020403070605050607000501 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 7/12/2016 09:22, Lowell Gilbert wrote: > Karl Denninger <karl@denninger.net> writes: > >> Why not force-detach the volume that takes the error instead of a pani= c()? >> >> That would lead to a panic if the detached volume was the system volum= e >> (obviously) but for a data volume it would simply result in it being >> forcibly unmounted (and dirty, so if it's corrupt it will get caught >> when reattached.) >> >> It seems that the current paradigm of saying "screw you, panic the >> machine" violates the principle of least astonishment and is overly >> punitive vis-a-vis necessity. Refusing further I/O because the volume= >> may now have a corrupt filesystem appears to be facially reasonable, b= ut >> that doesn't necessarily wind up being fatal the system itself -- it i= s >> if that's the system volume and is not covered by some sort of >> redundancy, obviously, but it's not in all cases. > How do you find the processes with pages mapped from the filesystem's > vnodes? UFS is *very* tightly tied to the VM system, and intentionally > so. Recall that "umount -f" isn't exactly safe... > _______________________________________________ You don't. If you wind up detaching something with open RSS pages (or worse, page file pages) you're going to take a panic. So what? You're no worse off than you are with what is done now. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms020403070605050607000501 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC Bl8wggZbMIIEQ6ADAgECAgEpMA0GCSqGSIb3DQEBCwUAMIGQMQswCQYDVQQGEwJVUzEQMA4G A1UECBMHRmxvcmlkYTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3Rl bXMgTExDMRwwGgYDVQQDExNDdWRhIFN5c3RlbXMgTExDIENBMSIwIAYJKoZIhvcNAQkBFhND dWRhIFN5c3RlbXMgTExDIENBMB4XDTE1MDQyMTAyMjE1OVoXDTIwMDQxOTAyMjE1OVowWjEL MAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExGTAXBgNVBAoTEEN1ZGEgU3lzdGVtcyBM TEMxHjAcBgNVBAMTFUthcmwgRGVubmluZ2VyIChPQ1NQKTCCAiIwDQYJKoZIhvcNAQEBBQAD ggIPADCCAgoCggIBALmEWPhAdphrWd4K5VTvE5pxL3blRQPyGF3ApjUjgtavqU1Y8pbI3Byg XDj2/Uz9Si8XVj/kNbKEjkRh5SsNvx3Fc0oQ1uVjyCq7zC/kctF7yLzQbvWnU4grAPZ3IuAp 3/fFxIVaXpxEdKmyZAVDhk9az+IgHH43rdJRIMzxJ5vqQMb+n2EjadVqiGPbtG9aZEImlq7f IYDTnKyToi23PAnkPwwT+q1IkI2DTvf2jzWrhLR5DTX0fUYC0nxlHWbjgpiapyJWtR7K2YQO aevQb/3vN9gSojT2h+cBem7QIj6U69rEYcEDvPyCMXEV9VcXdcmW42LSRsPvZcBHFkWAJqMZ Myiz4kumaP+s+cIDaXitR/szoqDKGSHM4CPAZV9Yh8asvxQL5uDxz5wvLPgS5yS8K/o7zDR5 vNkMCyfYQuR6PAJxVOk5Arqvj9lfP3JSVapwbr01CoWDBkpuJlKfpQIEeC/pcCBKknllbMYq yHBO2TipLyO5Ocd1nhN/nOsO+C+j31lQHfOMRZaPQykXVPWG5BbhWT7ttX4vy5hOW6yJgeT/ o3apynlp1cEavkQRS8uJHoQszF6KIrQMID/JfySWvVQ4ksnfzwB2lRomrdrwnQ4eG/HBS+0l eozwOJNDIBlAP+hLe8A5oWZgooIIK/SulUAsfI6Sgd8dTZTTYmlhAgMBAAGjgfQwgfEwNwYI KwYBBQUHAQEEKzApMCcGCCsGAQUFBzABhhtodHRwOi8vY3VkYXN5c3RlbXMubmV0Ojg4ODgw CQYDVR0TBAIwADARBglghkgBhvhCAQEEBAMCBaAwCwYDVR0PBAQDAgXgMCwGCWCGSAGG+EIB DQQfFh1PcGVuU1NMIEdlbmVyYXRlZCBDZXJ0aWZpY2F0ZTAdBgNVHQ4EFgQUxRyULenJaFwX RtT79aNmIB/u5VkwHwYDVR0jBBgwFoAUJHGbnYV9/N3dvbDKkpQDofrTbTUwHQYDVR0RBBYw FIESa2FybEBkZW5uaW5nZXIubmV0MA0GCSqGSIb3DQEBCwUAA4ICAQBPf3cYtmKowmGIYsm6 eBinJu7QVWvxi1vqnBz3KE+HapqoIZS8/PolB/hwiY0UAE1RsjBJ7yEjihVRwummSBvkoOyf G30uPn4yg4vbJkR9lTz8d21fPshWETa6DBh2jx2Qf13LZpr3Pj2fTtlu6xMYKzg7cSDgd2bO sJGH/rcvva9Spkx5Vfq0RyOrYph9boshRN3D4tbWgBAcX9POdXCVfJONDxhfBuPHsJ6vEmPb An+XL5Yl26XYFPiODQ+Qbk44Ot1kt9s7oS3dVUrh92Qv0G3J3DF+Vt6C15nED+f+bk4gScu+ JHT7RjEmfa18GT8DcT//D1zEke1Ymhb41JH+GyZchDRWtjxsS5OBFMzrju7d264zJUFtX7iJ 3xvpKN7VcZKNtB6dLShj3v/XDsQVQWXmR/1YKWZ93C3LpRs2Y5nYdn6gEOpL/WfQFThtfnat HNc7fNs5vjotaYpBl5H8+VCautKbGOs219uQbhGZLYTv6okuKcY8W+4EJEtK0xB08vqr9Jd0 FS9MGjQE++GWo+5eQxFt6nUENHbVYnsr6bYPQsZH0CRNycgTG9MwY/UIXOf4W034UpR82TBG 1LiMsYfb8ahQJhs3wdf1nzipIjRwoZKT1vGXh/cj3gwSr64GfenURBxaFZA5O1acOZUjPrRT n3ci4McYW/0WVVA3lDGCBRMwggUPAgEBMIGWMIGQMQswCQYDVQQGEwJVUzEQMA4GA1UECBMH RmxvcmlkYTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3RlbXMgTExD MRwwGgYDVQQDExNDdWRhIFN5c3RlbXMgTExDIENBMSIwIAYJKoZIhvcNAQkBFhNDdWRhIFN5 c3RlbXMgTExDIENBAgEpMA0GCWCGSAFlAwQCAwUAoIICTTAYBgkqhkiG9w0BCQMxCwYJKoZI hvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNjA3MTIxNDI5NDZaME8GCSqGSIb3DQEJBDFCBECw 8o6XFpSa/et/b8mFFdbDPSvC0EGARmLYkOTfr+FW3r6kSKhL9KXGMPLERNn2z8yPLhOeadO9 jeSEc061WlAzMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEqMAsGCWCGSAFlAwQBAjAK BggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYI KoZIhvcNAwICASgwgacGCSsGAQQBgjcQBDGBmTCBljCBkDELMAkGA1UEBhMCVVMxEDAOBgNV BAgTB0Zsb3JpZGExEjAQBgNVBAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1z IExMQzEcMBoGA1UEAxMTQ3VkYSBTeXN0ZW1zIExMQyBDQTEiMCAGCSqGSIb3DQEJARYTQ3Vk YSBTeXN0ZW1zIExMQyBDQQIBKTCBqQYLKoZIhvcNAQkQAgsxgZmggZYwgZAxCzAJBgNVBAYT AlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1 ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExIjAgBgkqhkiG 9w0BCQEWE0N1ZGEgU3lzdGVtcyBMTEMgQ0ECASkwDQYJKoZIhvcNAQEBBQAEggIAY1u8ncC+ DFOtk51eL2Bf/7hqbkXx+b2hkoYsTsDYic5fmW36seHm52u3Vb/9klXVsoCR+Yw4wJIEEPqE Gvlk92Bta9qJNvMI8DhomeW7YluacrkqSZJ/ZdoqFl0FLr1o58jXG7YYTUXIy+sDwO5yXuRu S8KilZQPEgru4ZGP0Hc4qmKc8WDDx2isqGJ8VeMA3mdePjeU7EUyqOU7cU7QEztEgAWf71Bb xcawRBJ6vgSLlToYuLzXUKwdypg+40kwrqmuL+2H8D/N+/H1SngJRojOL1oxmkp3EfX5vT9X KbyozhfgS74b+vrTAzIjpw+8cw/RS12jimwogvzKMvKHHMBMIw9wBkTcqXb98FvLpsQY+hQx 4/U3jpf4fbrdNv3IkwmAanNOc2dKmt6j0OruE7YoG260VyUhYvCAbfEgXeRXqpAiAecoKE7M nDl+IyKvRPzRqNewTc63U6CKUWUtwD+kRF8etVUPwyjt0w7NSsMvHOTpOEhWHeEn67frqDvV Ugt1wa4NydrUXlsaLKdl3IFESnd7xFve1f6A33mM3M88TBC7CJs5lLw0Nb4kU1OQbgHDs+uY gX1p4gOP9moGC7+TynRbHajkHQ8lHPhU4iYWFJlII+V6JsRFoXk7uXJfhK6IAE8nNM+o/baq He0PTFrspLkrxiSWfkfG/g8dJ88AAAAAAAA= --------------ms020403070605050607000501--
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