I/O error on loop device during booting up while HDD is healthy(12.04,wubi)
A month ago I've noticed strange booting slowdown of Ubuntu Precise installed in my HP Pavilion DV6 in Win7 partition with wubi. Now it happens too frequently. Also I noticed that notebook shutted down to fast.
Sometimes after successfully logging in I see read-only mounted root filesystem and after that I have to restart from Live-USB and to do fsck of loop device (/dev/loop0 -> /host/ubuntu/
I looked In dmesg and saw "I/O error" messages:
[ 6.753514] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 6.756031] sdb: sdb1 sdb2 < sdb5 >
[ 6.759761] sd 6:0:0:0: [sdb] No Caching mode page present
[ 6.759772] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 6.759781] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[ 7.461819] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null)
[ 11.663126] ata1.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x0
[ 11.663138] ata1.00: irq_stat 0x40000008
[ 11.663145] ata1.00: failed command: READ FPDMA QUEUED
[ 11.663157] ata1.00: cmd 60/00:08:
[ 11.663158] res 41/40:00:
[ 11.663172] ata1.00: status: { DRDY ERR }
[ 11.663177] ata1.00: error: { UNC }
...
[ 22.695770] end_request: I/O error, dev sda, sector 420441449
[ 22.695777] Buffer I/O error on device sda2, logical block 52503981
[ 22.695784] Buffer I/O error on device sda2, logical block 52503982
[ 22.695791] Buffer I/O error on device sda2, logical block 52503983
[ 22.695798] Buffer I/O error on device sda2, logical block 52503984
[ 22.695804] Buffer I/O error on device sda2, logical block 52503985
...
Lookes like the hard disk will be dead soon and I started to find money to buy new HDD. I booted with SysRescueCD and tried to check loop-device with fsck -c. But there we NO errors. I've checked it twice. Hard disk is not guilty. May be unclean shutdown of (loop-)mounted filesystem corrupts the underlying storage layout ? I don't know
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