[LU-8057] o2iblnd driver is causing memory corruption due to improper handling of scatter list.

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.9.0
• Affects Version/s: Lustre 2.7.0, Lustre 2.8.0, Lustre 2.9.0
• Labels: patch
• Environment: Any installation running Lustre on top of a infiniband stack.
• Severity: 3
• Assignee: Doug Oucharek (Inactive)
• Reporter: James A Simmons

Description

A bug was discovered in the upstream kernel in the handling of the scatter list, tx->tx_frag, in the o2iblnd driver. So the fix of using sg_next was introduced but it revealed a serious bug in that when all 256 pages allocated for fragments are used and the data is at an offset that an extra random page of memory is stomped on.

Issue Links

• is related to: LU-8715 Regression from LU-8057 causes loading of fld.ko hung in 2.7.2
• is related to: LU-4423 Tracking of patches from upstream kernel to Lustre client