[Bug 12945] New: SCSI Generic (sg): BUG: sleeping function called from invalid context

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http://bugzilla.kernel.org/show_bug.cgi?id=12945

           Summary: SCSI Generic (sg): BUG: sleeping function called from
                    invalid context
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: 2.6.28.9
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
        ReportedBy: txtoxtox285@googlemail.com
        Regression: No


Created an attachment (id=20685)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=20685)
Stack trace on program kill (2.6.28.9)

I am experimenting with CD audio extraction. I use the SCSI Generic driver for
this.

My test program uses read() and write() (instead of ioctl) to send requests to
the driver and receive responses. I use SG_FLAG_DIRECT_IO.

When I kill my program (because I don't want to wait until it has ripped the
entire CD), I am often rewarded with messages like "BUG: sleeping function
called from invalid context at linux-2.6.28.9/include/linux/pagemap.h:347". I
have attached typical stack trace.

Another case when I hit this BUG is when I set a time out and the CD drive
doesn't respond fast enough. A stack trace is attached.

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