Лог ядра при отказе системного диска
Совершенно случайно удалось записать лог ядра при отказе системнного диска. Решил сделать этакое наглядное пособие.
Вообще, сначала грешил на особенности kvm'а на amd (вторая строчка в логе), но поймал отвал диска. Как выяснилось впоследствии - у него глючный контроллер, небольшая нагрузка - и система встаёт колом, без каких бы то ни было сообщений. SysRQ помогал не всегда.
[ 1002.274069] netconsole: target (192.168.0.5) is enabled, disable to update parameters
[ 1167.762365] kvm: 1568: cpu0 unhandled rdmsr: 0xc0010001
[13918.451989] ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[13918.452040] ata1.01: failed command: FLUSH CACHE
[13918.452079] ata1.01: cmd e7/00:00:00:00:00/00:00:00:00:00/b0 tag 0
[13918.452080] res 40/00:00:00:00:00/00:00:00:00:00/10 Emask 0x4 (timeout)
[13918.452151] ata1.01: status: { DRDY }
[13933.688801] ata1.01: revalidation failed (errno=-5)
[13953.868670] ata1.01: revalidation failed (errno=-5)
[13984.022004] ata1.01: revalidation failed (errno=-5)
[13984.175414] end_request: I/O error, dev sda, sector 8925304
[13984.175458] end_request: I/O error, dev sda, sector 8925304
[13984.175504] Aborting journal on device sda3-8.
[13984.175516] end_request: I/O error, dev sda, sector 14491288
[13984.175520] Buffer I/O error on device sda3, logical block 1261267
[13984.175540] end_request: I/O error, dev sda, sector 14494904
[13984.175543] Buffer I/O error on device sda3, logical block 1261719
[13984.175558] end_request: I/O error, dev sda, sector 14688160
[13984.175560] Buffer I/O error on device sda3, logical block 1285876
[13984.175574] end_request: I/O error, dev sda, sector 14688272
[13984.175576] Buffer I/O error on device sda3, logical block 1285890
[13984.175600] end_request: I/O error, dev sda, sector 14689640
[13984.175602] Buffer I/O error on device sda3, logical block 1286061
[13984.175617] end_request: I/O error, dev sda, sector 16992520
[13984.175619] Buffer I/O error on device sda4, logical block 1057
[13984.175635] end_request: I/O error, dev sda, sector 13052744
[13984.175637] Buffer I/O error on device sda3, logical block 1081449
[13984.175651] end_request: I/O error, dev sda, sector 13329152
[13984.175654] Buffer I/O error on device sda3, logical block 1116000
[13984.175675] end_request: I/O error, dev sda, sector 13460600
[13984.175678] Buffer I/O error on device sda3, logical block 1132431
[13984.175717] end_request: I/O error, dev sda, sector 13538848
[13984.175719] Buffer I/O error on device sda3, logical block 1142212
[13984.175734] end_request: I/O error, dev sda, sector 5899040
[13984.175749] end_request: I/O error, dev sda, sector 5304384
[13984.176316] end_request: I/O error, dev sda, sector 5304384
[13984.176362] end_request: I/O error, dev sda, sector 4401152
[13984.176364] Buffer I/O error on device sda3, logical block 0
[13984.176375] EXT4-fs error (device sda3): ext4_journal_start_sb:327: Detected aborted journal
[13984.176377] EXT4-fs (sda3): Remounting filesystem read-only
[13984.176379] EXT4-fs (sda3): previous I/O error to superblock detected
[13984.176395] end_request: I/O error, dev sda, sector 4401152
[13984.176397] Buffer I/O error on device sda3, logical block 0
[13984.176469] end_request: I/O error, dev sda, sector 5304384
[13984.177050] end_request: I/O error, dev sda, sector 61108768
[13984.177087] Buffer I/O error on device sda4, logical block 5515588
[13984.177205] end_request: I/O error, dev sda, sector 46612944
[13984.177250] end_request: I/O error, dev sda, sector 8857600
[13984.177280] Buffer I/O error on device sda3, logical block 557056
[13984.177357] JBD2: I/O error detected when updating journal superblock for sda3-8.
[13984.177460] end_request: I/O error, dev sda, sector 14491288
[13984.177489] Aborting journal on device sda4-8.
[13984.177517] Buffer I/O error on device sda3, logical block 1261267
[13984.177576] end_request: I/O error, dev sda, sector 14688272
[13984.177622] end_request: I/O error, dev sda, sector 46606336
[13984.177625] Buffer I/O error on device sda4, logical block 3702784
[13984.177690] Buffer I/O error on device sda3, logical block 1285890
[13984.179219] JBD2: I/O error detected when updating journal superblock for sda4-8.
[13984.182011] end_request: I/O error, dev sda, sector 16984064
[13984.182015] Buffer I/O error on device sda4, logical block 0
[13984.182031] EXT4-fs error (device sda4): ext4_journal_start_sb:327: Detected aborted journal
[13984.182034] EXT4-fs (sda4): Remounting filesystem read-only
[13984.182041] EXT4-fs (sda4): previous I/O error to superblock detected
[13984.182063] end_request: I/O error, dev sda, sector 16984064
[13984.182064] Buffer I/O error on device sda4, logical block 0
[13991.147364] end_request: I/O error, dev sda, sector 5304384
[13991.147467] end_request: I/O error, dev sda, sector 5304384
[14008.900512] end_request: I/O error, dev sda, sector 6133272
[14008.900605] end_request: I/O error, dev sda, sector 6133272
[14008.900687] end_request: I/O error, dev sda, sector 6133272
[14022.820477] end_request: I/O error, dev sda, sector 13374416
[14022.820558] end_request: I/O error, dev sda, sector 13374416
[14022.820643] end_request: I/O error, dev sda, sector 13374416