Ubuntu
linux package

  1. Bug #1795453
  2. Comment #0

Comment 0 for bug 1795453

Revision history for this message
Sasikumar (sasikumarpc) wrote : IO's are issued with incorrect Scatter Gather Buffer

We have observed that OS is sending the IO's (SCSI Read/Write) with incorrect Scatter Gather Buffer address .

i.e

 OS is sending the IO with 64 bit Scatter Gather Buffer address , such that if we add the length with buffer address then it causes the roll over .

Here is the data we captured in our driver (Printed the SGE details which was sent by OS)

sgl_ptr->Address = fffffffffffff000
[14547.313240]
                sgl_ptr->Length = 1000
[14547.313241]
                sge_count = 18
[14547.313242]
                cmd->index = 9d9

Note : This issue is observed only when virtualization is enabled

Product : Broadcom (LSI) Megaraid H840 controller