Possible logic bug in either EXT4 FS or SATA driver.

[D. Stussy]

Syslog:
kernel: ata1: illegal qc_active transition (3fffffff->fffffffe)

When this happens, the filesystem on the offending disk is auto-remounted
as read-only.  Is this an indication of a bug in the ext4 filesystem or in
the SATA driver?

I am seeing this bug with a 3.1.5 kernel compiled from source about every
3-4 days.  Soft rebooting does not work; a hard reset is required.

System:  AMD Opteron 4184 stepping 01 (6-core) 2.8GHz (2794.027 MHz) 64-bit
MB:  Supermicro H8SCM-F / 32GB ECC Ram
HD:  ATA-8: ST32000644NS, SN11, max UDMA/133
     3907029168 sectors, multi 16: LBA48 NCQ (depth 31/32)
     (1.81 TB) SATA link up 3.0 Gbps (SStatus 123 SControl 300)
     Write Protect is off / Mode Sense: 00 3a 00 00
     Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
EXT4:  Basic filesystem, no extended attributes nor using driver for
ext2/3.


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