Hi,
I am having issues with my Netgear WNDR3700 under load. It is used as a small NAS and Media Server with afpd, minidlna and mpd running. Via an usb hub I connected a usb stick for /overlay, a usb soundcard and a 1TB 2,5" drive. The hdd has 2 partitions, one formatted ext3 for Time Machine backups and one NTFS for music/data.

This is working fine most of the time, however when copying files to the data partition while running a TM backup, the router sometimes virtually throws out the usb drive (/dev/sdb) and then recognizes it again as /dev/sdc.

The drive works fine attached to a pc. I have the impression this might be a memory management issue?

Do you have any ideas? Thanks in advance!

Here is the dmesg output:

[...]
usb 1-1.3.2: reset high speed USB device using ar71xx-ehci and address 5
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 3e 33 4f 77 00 00 f0 00
end_request: I/O error, dev sdb, sector 1043550071
Buffer I/O error on device sdb1, logical block 130443751
Buffer I/O error on device sdb1, logical block 130443752
Buffer I/O error on device sdb1, logical block 130443753
Buffer I/O error on device sdb1, logical block 130443754
Buffer I/O error on device sdb1, logical block 130443755
Buffer I/O error on device sdb1, logical block 130443756
Buffer I/O error on device sdb1, logical block 130443757
Buffer I/O error on device sdb1, logical block 130443758
Buffer I/O error on device sdb1, logical block 130443759
Buffer I/O error on device sdb1, logical block 130443760
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 3e 33 50 67 00 00 10 00
end_request: I/O error, dev sdb, sector 1043550311
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7f 23 7f 00 00 20 00
end_request: I/O error, dev sdb, sector 1283400575
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7f 23 cf 00 00 10 00
end_request: I/O error, dev sdb, sector 1283400655
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7f 7b 7f 00 00 08 00
end_request: I/O error, dev sdb, sector 1283423103
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7f 7b cf 00 00 08 00
end_request: I/O error, dev sdb, sector 1283423183
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 21 b7 00 00 08 00
end_request: I/O error, dev sdb, sector 1283269047
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 2b bf 00 00 08 00
end_request: I/O error, dev sdb, sector 1283271615
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 2b df 00 00 08 00
end_request: I/O error, dev sdb, sector 1283271647
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 2b ef 00 00 08 00
end_request: I/O error, dev sdb, sector 1283271663
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 38 97 00 00 08 00
end_request: I/O error, dev sdb, sector 1283274903
usb 1-1.3.2: USB disconnect, address 5
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 4b 7f 00 00 08 00
end_request: I/O error, dev sdb, sector 1283279743
sd 1:0:0:0: [sdb] Unhandled error code
sd 1:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
sd 1:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 4c 7d 76 f7 00 00 08 00
end_request: I/O error, dev sdb, sector 1283290871
JBD2: Detected IO errors while flushing file data on sdb3-8
Aborting journal on device sdb3-8.
JBD2: I/O error detected when updating journal superblock for sdb3-8.
journal commit I/O error
EXT4-fs error (device sdb3): ext4_find_entry:933: inode #2: comm afpd: reading directory lblock 0
EXT4-fs (sdb3): previous I/O error to superblock detected
EXT4-fs error (device sdb3): ext4_journal_start_sb:260: Detected aborted journal
EXT4-fs (sdb3): Remounting filesystem read-only
EXT4-fs (sdb3): previous I/O error to superblock detected
EXT4-fs (sdb3): previous I/O error to superblock detected
EXT4-fs error (device sdb3): ext4_put_super:728: Couldn't clean up the journal
usb 1-1.3.2: new high speed USB device using ar71xx-ehci and address 7
scsi2 : usb-storage 1-1.3.2:1.0
scsi 2:0:0:0: Direct-Access     PI-239   USB 2.0 Drive    1.08 PQ: 0 ANSI: 4
sd 2:0:0:0: [sdc] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB) ## this is the drive reappearing
sd 2:0:0:0: [sdc] Write Protect is off
sd 2:0:0:0: [sdc] Mode Sense: 23 00 00 00
sd 2:0:0:0: [sdc] Assuming drive cache: write through
sd 2:0:0:0: [sdc] Assuming drive cache: write through
sdc: sdc1 sdc2 sdc3
sd 2:0:0:0: [sdc] Assuming drive cache: write through
sd 2:0:0:0: [sdc] Attached SCSI disk
usb 1-1.3.2: USB disconnect, address 7

It seems to me that the issue might be caused by inotify. I tried the same config now without it and the router no longer gets stuck when using netatalk/timemachine. Is there a way to disable inotify for certain partitions, e.g. with a special mount parameter?

Hello,
I'm experiencing the same issue here, with openwrt 10.03.1-rc5 running on routerstation. The connected HDD is a usb2.0 640GB with ext4 and swap partitions on it, with an external power supply.
Have you found any solution to this problem?

sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 25 45 37 b8 00 00 10 00
end_request: I/O error, dev sda, sector 625293240
Aborting journal on device sda1-8.
EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal
EXT4-fs (sda1): Remounting filesystem read-only

sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 25 44 08 00 00 00 08 00
end_request: I/O error, dev sda, sector 625215488
Buffer I/O error on device sda1, logical block 78151680
lost page write due to I/O error on sda1
JBD2: I/O error detected when updating journal superblock for sda1-8.
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 00 00 08 00 00 00 08 00
end_request: I/O error, dev sda, sector 2048
Buffer I/O error on device sda1, logical block 0
lost page write due to I/O error on sda1
EXT4-fs error (device sda1): ext4_put_super: Couldn't clean up the journal

Thanks!

again...

sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 10 b7 13 10 00 00 f0 00
end_request: I/O error, dev sda, sector 280433424
Buffer I/O error on device sda1, logical block 35053922
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053923
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053924
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053925
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053926
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053927
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053928
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053929
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053930
lost page write due to I/O error on sda1
Buffer I/O error on device sda1, logical block 35053931
lost page write due to I/O error on sda1
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 10 b7 14 00 00 00 f0 00
end_request: I/O error, dev sda, sector 280433664
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 10 b7 14 f0 00 00 f0 00
end_request: I/O error, dev sda, sector 280433904
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 10 b7 15 e0 00 00 f0 00
end_request: I/O error, dev sda, sector 280434144
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 10 b7 16 d0 00 00 b8 00
end_request: I/O error, dev sda, sector 280434384
JBD2: Detected IO errors while flushing file data on sda1-8
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 25 45 df 88 00 00 30 00
end_request: I/O error, dev sda, sector 625336200
Aborting journal on device sda1-8.
sd 1:0:0:0: [sda] Unhandled error code
sd 1:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 1:0:0:0: [sda] CDB: cdb[0]=0x2a: 2a 00 25 44 08 00 00 00 08 00
end_request: I/O error, dev sda, sector 625215488
JBD2: I/O error detected when updating journal superblock for sda1-8.
EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal
EXT4-fs (sda1): Remounting filesystem read-only

OK, the trick was in an unshielded usb cable (if anyone gets in the same trouble as I did)...