[Bug 224250] Sending SCSI command to ATA device makes kernel triple fault.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224250

--- Comment #18 from Scott Long <scottl at FreeBSD.org> ---
Comment on attachment 188806
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=188806
C snippet

The assertion is here:

VirtualBox-4.3.22/src/VBox/Devices/Storage/DevATA.cpp:5293
                if (s->uTxDir == PDMBLOCKTXDIR_FROM_DEVICE)
                    AssertRelease(bm->u8Cmd & BM_CMD_WRITE);

I'm a bit confused, I believe that the ATA driver sets this bit here:

src/sys/dev/ata/ata_all.c
                if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN)
                        request->flags |= ATA_R_READ;
and
src/sys/dev/ata/ata_pci.c
    ATA_IDX_OUTB(ch, ATA_BMCMD_PORT,
                 (ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_WRITE_READ) |
                 ((request->flags & ATA_R_READ) ? ATA_BMCMD_WRITE_READ : 0)|
                 ATA_BMCMD_START_STOP);

Maybe this isn't going through ata_pci_dmastart(), or maybe the flags are
getting cleared/not copied correctly prior?  I don't have time to look into it
further today.

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