RHEL5.9 mpt2sas driver hangs during SAS storage LUN initialization with messages about pci_map_sg failed: request for 255 bytes!

Solution Verified - Updated -

Issue

RHEL5.9 hangs during SAS storage LUN initialization, with the following messages :
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request for 255 bytes!
sd 1:0:0:2: pci_map_sg failed: request ...

Environment

  • RHEL5.9 kernel version 2.6.18-348.6.1.el5.x86_64
  • Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2308 PCI-Express Fusion-MPT SAS-2 (rev 01)

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