VFAT drive keeps turning into read only

I notice that I one of my mounted VFAT drives, after online for a while, is becoming read only. Why would this happen? To resolve it, I have to umount and then mount it. After a while, I have to do it again. Here's the relevant line in my fstab:
/dev/hdb1 /mnt/back vfat auto,umask=000,uid=1000,gid=100 0 0
My user id and gid are the ones you see above. Here's an ls -l output of that partition:
drwxrwxrwx 37 ralvy users 32768 2006-02-07 19:03 back
No writes or deletes can be done on that drive right now.
A few seconds later, after umount/mount of /mnt/back ...
All is fine again. Why?
I'm running Arch current/extra up to date.

brain0 wrote:Check your syslog (/var/log/*). There might be something that tells you the reason (though I've only such this behaviour with ext2/3 so far).
Found this for that day:
Feb 7 11:43:17 tux FAT: Filesystem panic (dev hdb1)
Feb 7 11:43:17 tux fat_free_clusters: deleting FAT entry beyond EOF
Feb 7 11:43:17 tux File system has been set read-only
So I just did
fsck -t vfat -a /mnt/back
and let it fix the problems. We'll see this stops it. Sounds like it will.
Thanks for the suggestion.

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    ehci_hcd 0000:00:02.1: restoring config space at offset 0x1 (was 0xb00006, writing 0xb00002)
    ohci_hcd 0000:00:04.0: restoring config space at offset 0x1 (was 0xb00007, writing 0xb00003)
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    pcieport-driver 0000:00:14.0: restoring config space at offset 0x7 (was 0x1f1, writing 0x200001f1)
    pcieport-driver 0000:00:14.0: restoring config space at offset 0x1 (was 0x100107, writing 0x1005
    nvidia 0000:02:00.0: restoring config space at offset 0xf (was 0x100, writing 0x10a)
    nvidia 0000:02:00.0: restoring config space at offset 0x9 (was 0x1, writing 0x4001)
    nvidia 0000:02:00.0: restoring config space at offset 0x7 (was 0xc, writing 0xc400000c)
    nvidia 0000:02:00.0: restoring config space at offset 0x5 (was 0xc, writing 0xd000000c)
    ath5k 0000:07:00.0: restoring config space at offset 0x3 (was 0x0, writing 0x10)
    nForce2_smbus 0000:00:01.1: PME# disabled
    ohci_hcd 0000:00:02.0: PME# disabled
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    ehci_hcd 0000:00:02.1: PCI INT B -> Link[LUS2] -> GSI 17 (level, low) -> IRQ 17
    ehci_hcd 0000:00:02.1: setting latency timer to 64
    ehci_hcd 0000:00:02.1: PME# disabled
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    ehci_hcd 0000:00:02.1: cache line size of 64 is not supported
    ohci_hcd 0000:00:04.0: PME# disabled
    ohci_hcd 0000:00:04.0: PCI INT A -> Link[Z010] -> GSI 16 (level, low) -> IRQ 16
    ohci_hcd 0000:00:04.0: setting latency timer to 64
    ohci_hcd 0000:00:04.0: PME# disabled
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    ehci_hcd 0000:00:04.1: PCI INT B -> Link[Z011] -> GSI 16 (level, low) -> IRQ 16
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    pata_amd 0000:00:06.0: restoring config space at offset 0x1 (was 0xb00005, writing 0xb80005)
    pata_amd 0000:00:06.0: setting latency timer to 64
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    HDA Intel 0000:00:07.0: PCI INT A -> Link[LAZA] -> GSI 19 (level, low) -> IRQ 19
    HDA Intel 0000:00:07.0: setting latency timer to 64
    pci 0000:00:08.0: setting latency timer to 64
    ahci 0000:00:09.0: setting latency timer to 64
    forcedeth 0000:00:0a.0: wake-up capability disabled by ACPI
    forcedeth 0000:00:0a.0: PME# disabled
    ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
    ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    forcedeth 0000:00:0a.0: irq 26 for MSI/MSI-X
    eth0: no link during initialization.
    pci 0000:00:0b.0: setting latency timer to 64
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    ata4.00: revalidation failed (errno=-5)
    ata3.00: qc timeout (cmd 0xa1)
    ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata3.00: revalidation failed (errno=-5)
    ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
    ata3.00: qc timeout (cmd 0xa1)
    ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata3.00: revalidation failed (errno=-5)
    ata3: limiting SATA link speed to 1.5 Gbps
    ata4.00: qc timeout (cmd 0xec)
    ata4.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata4.00: revalidation failed (errno=-5)
    ata4: limiting SATA link speed to 1.5 Gbps
    ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
    ata4: SATA link up <unknown> (SStatus 103 SControl 310)
    ata4.00: qc timeout (cmd 0xec)
    ata4.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata4.00: revalidation failed (errno=-5)
    ata4.00: disabled
    ata3.00: qc timeout (cmd 0xa1)
    ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata3.00: revalidation failed (errno=-5)
    ata3.00: disabled
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    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 134590273
    Buffer I/O error on device sda2, logical block 1094141
    lost page write due to I/O error on sda2
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 135807281
    Buffer I/O error on device sda2, logical block 1246267
    lost page write due to I/O error on sda2
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 135815833
    Buffer I/O error on device sda2, logical block 1247336
    lost page write due to I/O error on sda2
    JBD2: Detected IO errors while flushing file data on sda2:8
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 155463993
    Aborting journal on device sda2:8.
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 155459417
    Buffer I/O error on device sda2, logical block 3702784
    lost page write due to I/O error on sda2
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    usb 3-4: reset high speed USB device using ehci_hcd and address 2
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    Call Trace:
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    [<ffffffff8026c6a4>] ? bit_waitqueue+0x24/0xe0
    [<ffffffff802c8332>] ? do_writepages+0x32/0x60
    [<ffffffff80321b7a>] ? __writeback_single_inode+0xba/0x490
    [<ffffffff802406e6>] ? dequeue_task_fair+0x56/0x1d0
    [<ffffffff8020a95c>] ? __switch_to+0xdc/0x3b0
    [<ffffffff803223b3>] ? generic_sync_sb_inodes+0x193/0x530
    [<ffffffff803229c5>] ? writeback_inodes+0x65/0x120
    [<ffffffff802c85a6>] ? wb_kupdate+0xc6/0x160
    [<ffffffff802c995b>] ? pdflush+0x16b/0x2a0
    [<ffffffff802c84e0>] ? wb_kupdate+0x0/0x160
    [<ffffffff802c97f0>] ? pdflush+0x0/0x2a0
    [<ffffffff802c97f0>] ? pdflush+0x0/0x2a0
    [<ffffffff8026c204>] ? kthread+0x64/0xc0
    [<ffffffff8024af20>] ? schedule_tail+0x30/0x80
    [<ffffffff8020d4fa>] ? child_rip+0xa/0x20
    [<ffffffff8026c1a0>] ? kthread+0x0/0xc0
    [<ffffffff8020d4f0>] ? child_rip+0x0/0x20
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126637417
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126637417
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126637417
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126637417
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126637417
    done.
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 130097993
    EXT4-fs error (device sda2): ext4_find_entry: reading directory #139292 offset 0
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126637417
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126004889
    EXT4-fs error (device sda2): ext4_find_entry: reading directory #98457 offset 0
    sd 3:0:0:0: [sda] Unhandled error code
    sd 3:0:0:0: [sda] Result: hostbyte=0x04 driverbyte=0x00
    end_request: I/O error, dev sda, sector 126004889
    EXT4-fs error (device sda2): ext4_find_entry: reading directory #98457 offset 0
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    Last edited by Cappy (2009-08-10 08:19:09)

    Nevermind .. *sigh* ... pci=msi on the kernel fixed it .. going to go cut myself now ...

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