** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2109601
Title:
[UBUNTU 22.04] net/smc: fix neighbour and rtable leak in
smc_ib_find_route()
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Bug description:
[Impact]
net/smc: fix neighbour and rtable leak in smc_ib_find_route()
In smc_ib_find_route(), the neighbour found by neigh_lookup() and rtable
resolved by ip_route_output_flow() are not released or put before return.
It may cause the refcount leak, so fix it.
[Fix]
Cherry pick the fix commit in Jammy:
- 2ddc0dd7fec8 net/smc: fix neighbour and rtable leak in smc_ib_find_route()
[Test Plan]
Compile tested only.
[Where Problems Could Occur]
The fix affects the SMC-R RDMA route resolution subsystem.
An issue with this fix may lead to incorrect handling of
reference counting neighbor and routing table objects
during RDMA path establishment.
A user might experience problems such asfailed RDMA connection setups
resulting in fallback to TCP even on capable hardware.
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Description:
net/smc: fix neighbour and rtable leak in smc_ib_find_route()
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Symptom: The handshake device gets hung during the cleanup after
the SMCR-v2 workload
Problem: In smc_ib_find_route(), the neighbour found by
neigh_lookup() and rtable resolved by ip_route_output_flow() are not
released or put before return. It may cause the refcount leak.
Solution: Release the neighbour found via neigh_release()
Upstream-ID: 2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06
Author: wen...@linux.ibm.com
Component: kernel
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