https://bugzilla.kernel.org/show_bug.cgi?id=64171
Bug ID: 64171
Summary: Block SCSI Generic Driver does not keep data
Product: SCSI Drivers
Version: 2.5
Kernel Version: 2.6.32.61
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Data written to any given file descriptor should be unique to that descriptor
and processor space. Currently, the BSG Driver does not keep this uniqueness.
As the attached simple program demonstrates, a SCSI Command queued to the
device in one process is dequeued by another process which has opened a handle
to the same device.
The attached file sends the simple SCSI "Test Unit Ready" command from the SCSI
Primary Command Spec. to the device using the BSG driver. As the program
demonstrates, the sg_io_v4.usr_ptr field, which is set in the "push" branch of
the program, is dequeued from the "pop" branch of the code.
I also tested this behavior on Fedora 19 and the bug exists there as well. F19
uses kernel 3.9.5.
Compile the attachment:
g++ -o <out> combined.cpp
Execute as follows:
sudo combined pop /dev/bsg/0:0:0:0 &
sudo combined push /dev/bsg/0:0:0:0
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