Date: Sun, 10 Jul 2016 19:54:38 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Not-so stable if you take a CAM error.... Message-ID: <2b0c454b-c1a0-4b5b-e778-bf0939e90ae1@denninger.net>
next in thread | raw e-mail | index | archive | help
This is a cryptographically signed message in MIME format. --------------ms030305070203070503020907 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Got a (nasty) surprise this afternoon on my sandbox machine. I was updating some Raspberry Pi2 machines which involved taking the sd card out, sticking it in an adapter and plugging it into the sandbox, then mounting the partition and using rsync. Unfortunately one of the cards was, unknown to me, bad and returned a write error during the update. The machine panic'd immediately after the CAM write error popped up. I was quite surprised by this, since (1) the SD card was (of course) mounted as a UFS filesystem; it shows up as a CAM device, (2) the machine itself is running off a ZFS root on a normal host-adapter and thus there is no comingling of the buffer cache and (3) there were no images being run from (can't, wrong architecture!) nor any system I/O (e.g. pagefile) going to the SD card. I certainly understand that under some circumstances (maybe even most circumstances) taking a hard I/O error to a system device is going to hose you and a panic() is arguably "least astonishment" when the price of being wrong might be a corrupted system file or worse (e.g. corrupted paged-out RSS, etc.) But I didn't expect a panic out a failed write to a device that is mounted and being used purely for data. I don't have a crash dump but can almost-certainly reproduce this if it's something that shouldn't happen and thus merits investigation. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms030305070203070503020907 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 hvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNjA3MTEwMDU0MzhaME8GCSqGSIb3DQEJBDFCBEDg hNeXBG8Jy+zcfTFHIA0hRLUJ+aQoX3F9BIr4c0+B3MazFzQylrvg1AdNlUpkhTYX86aN8qFo 6ssBe7YwdUMLMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEqMAsGCWCGSAFlAwQBAjAK BggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYI KoZIhvcNAwICASgwgacGCSsGAQQBgjcQBDGBmTCBljCBkDELMAkGA1UEBhMCVVMxEDAOBgNV BAgTB0Zsb3JpZGExEjAQBgNVBAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1z IExMQzEcMBoGA1UEAxMTQ3VkYSBTeXN0ZW1zIExMQyBDQTEiMCAGCSqGSIb3DQEJARYTQ3Vk YSBTeXN0ZW1zIExMQyBDQQIBKTCBqQYLKoZIhvcNAQkQAgsxgZmggZYwgZAxCzAJBgNVBAYT AlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1 ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExIjAgBgkqhkiG 9w0BCQEWE0N1ZGEgU3lzdGVtcyBMTEMgQ0ECASkwDQYJKoZIhvcNAQEBBQAEggIABoHHcnqn oKhFVdel2KUIy820CRTHryO7orfQNwTa4DDKm/8J4o39KkcQWDlPcolo7Xq/oQT601LDm8TX Ry/MirI/GmCsmSt8e/ct/n451r+YfhLX3x+xzBfLV4Xr09QBvj/SsdVfUhvvKxW+ywQLybfb aCQpyB5K27IPujCxMdpcVpQzijsngc/OiSgQp0la9doju5H6DSHA1Kb9yhX9PvgwdpBm4IpQ /Gtnqa73lhEH96xkFkgCHoHVhhNooUgL9D8K07CCNwJh+ZW5pHN4DmlX/UDfRlCBfxL6yw2p m82GiWFdHdBgrU5fdgqnRhVa+qKcAoXkOUEBeNH9p+nnrHSZipJmBd9D0vSbdpZwVaq8Dpib 1Pv4zwKODsc/WLDdtxBfE1+AUCYR4wPnpp0u4LdveUUr7xvnDJspU5i3bScfUtkvXw5ETSKf gAaXjR3AFuBKyGW5SHEEvMhBJ1yPxjI0iAgq7wHhEQ1DL3YBX43D5o0dQC6aMs2BRjujdOtj gSHIN7sBBOwkAc7WWBi+ZWjev7RLNkVT7rEG3nwaXyP4nIcdFz6OiqbPt7DAd/+bKPoXlmI+ cDwY9YvEI88AWfv4hASez7l4ujIgHRPhxX7UfRXOX8rnfrNGVU2BXkmg2f4ctnlgyBHdIUP0 1IjqZoQGAH0zNd/bnDOY+5uP+nEAAAAAAAA= --------------ms030305070203070503020907--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?2b0c454b-c1a0-4b5b-e778-bf0939e90ae1>