Date: Mon, 11 Jul 2016 12:44:24 -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: <21f3f685-4618-e258-0538-75602608cf9b@denninger.net> In-Reply-To: <1468258789.72182.122.camel@freebsd.org> 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> <1468258789.72182.122.camel@freebsd.org>
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This is a cryptographically signed message in MIME format. --------------ms000506080103070206030702 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 7/11/2016 12:39, Ian Lepore wrote: > On Mon, 2016-07-11 at 12:30 -0500, Karl Denninger wrote: >> On 7/11/2016 11:32, Ian Lepore wrote: >>> On Mon, 2016-07-11 at 09:50 -0400, Brandon Allbery wrote: >>>> On Mon, Jul 11, 2016 at 9:46 AM, Karl Denninger < >>>> karl@denninger.net> >>>> wrote: >>>> >>>>> Here's the backtrace ... sounds like expected behavior, which >>>>> is >>>>> not-so >>>>> good all-in for a situation like this. I guess the strategy is >>>>> to >>>>> turn >>>>> off softupdates before attempting such an update so as not to >>>>> crash >>>>> the >>>>> host machine if there's a problem with the card. >>>>> >>>> I would tend to assume that removable media should not have >>>> softupdates >>>> enabled. Even with properly working media, it's practically >>>> begging >>>> for >>>> corruption. >>>> >>> Writing to an sdcard without softupdates enabled will be an >>> exercise in >>> patience. Like, come back next week and maybe it'll be done. >>> >>> The only thing that comes to mind with this is maybe some sort of >>> mount >>> flag to say you're willing to live with any amount of filesystem >>> corruption in lieu of panicking. I'm not sure how easy/practical >>> that >>> would be to implement, though. >>> >>> -- Ian >> Why not force-detach the volume that takes the error instead of a >> panic()? >> > Patches welcome. > > -- Ian Any hints on where the routine(s) live that would forcibly detach a volume? (I'll go digging as well but shortening the time would help :)) --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms000506080103070206030702 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 hvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNjA3MTExNzQ0MjRaME8GCSqGSIb3DQEJBDFCBEBt 3sYxGYuEP50jJ65rZWVHQadVt5SR8mRz4ANG/1xRIo5HxUbvI8w0rxq14ILjMWC0MPaHqqj/ Xc+VXMmaRGEsMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEqMAsGCWCGSAFlAwQBAjAK BggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYI KoZIhvcNAwICASgwgacGCSsGAQQBgjcQBDGBmTCBljCBkDELMAkGA1UEBhMCVVMxEDAOBgNV BAgTB0Zsb3JpZGExEjAQBgNVBAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1z IExMQzEcMBoGA1UEAxMTQ3VkYSBTeXN0ZW1zIExMQyBDQTEiMCAGCSqGSIb3DQEJARYTQ3Vk YSBTeXN0ZW1zIExMQyBDQQIBKTCBqQYLKoZIhvcNAQkQAgsxgZmggZYwgZAxCzAJBgNVBAYT AlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1 ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExIjAgBgkqhkiG 9w0BCQEWE0N1ZGEgU3lzdGVtcyBMTEMgQ0ECASkwDQYJKoZIhvcNAQEBBQAEggIAPFGn4Soz yhTS66S8uaBtAe1g2ClhhDKg4U75Kqh7CtO1VObBD9xkbA9NizpToC04nTAfe0b+91TQsaVa kvSHgdUHXetw26D32Bcvezk4Gm5DfxfE4gyQrvRj2FHTA4UYMX497sCvuxUe/dDAonCAiOvQ ZTZLPHoSsHOcWBeildXLRY5VV4C6n23Mtg07Y9kv2JChr42SY1oDFmxZekn/mB/tnU8CuTfJ 1oTUonZhhGFZpyLvtSCtpjCZ48d3JG/JVPlXaT7MHf9wFKIiWU1HABz773+lo0MrtD9I9l+y Z2NJiYD/E4Xl7zQWbRM/LeyeSktsb8q3EH376EkYxLqPOuWS3Q1ymOWmRUQpwwRpS+crh+gU YSsttdoOGp+3eiHas0++i4UhWUgjKpIEn0rzUBh2/sRquQUel52vsdX5KjlrkxnuZpF1os4x F3LhYOA1nMdgz/GaxuvpZFH7LATVucizkXPvV3ZxmWQYikGrzUOuwOWKbBasmxZyAiVXFrf7 hRzQMal3G2PHRFN/u+G1R64aedXrk33UM/HMgJLOSwkDFC8YzBoPaZVaJ9lH/RVkiAtw0OTB HJpzg/JdpCGR96NALOt2jDhFna+Xt3RXdvi3wxEdSQ/N5WcT080EmXgQcufyKtnXVUTjUaLH re4b7hu+9r6WfQ1NFNb9x5a3mL0AAAAAAAA= --------------ms000506080103070206030702--
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