Public bug reported:
[Impact]
In BF5.15 (Jammy), CX7 cards experience consistent CQ errors with syndrome 0x1
when running a performance script:
mlx5_core 0000:08:00.0: cq_err_event_notifier:538:(pid 9712): CQ error on CQN
0x424, syndrome 0x1
Multiple call traces appear in dmesg and the system becomes unresponsive. The
test may require multiple iterations to trigger the issue.
The root cause appears to be a missing upstream fix that can lead to crashes or
warnings when netlink policy is not found, potentially causing the observed CQ
errors during high-connection testing scenarios.
[Fix]
Cherry picking the upstream commit:
154ba79c9f16 ("genetlink: correctly begin the iteration over policies")
This commit fixes incorrect initialization in genl_op_iter_init() by
ensuring genl_op_iter_next() is called to properly begin the iteration.
The fix prevents crashes and warnings in
netlink_policy_dump_get_policy_idx() when policy is not found, which may
be contributing to the CQ error condition during intensive connection
testing.
[Test Case]
Compile tested on linux-bluefield-5.15 on the master-next branch.
Functional testing involves:
Running the test with multiple iterations on CX7 hardware with a
linux-bluefield-5.15 kernel that includes the fix. With the patch applied, the
test should complete without CQ errors and system should remain responsive.
[Regression Potential]
The change is minimal and matches the upstream implementation exactly.
** Affects: linux-bluefield (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2117349
Title:
Ubuntu 22.04: CQ errors causing system unresponsiveness
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