** Also affects: linux-bluefield (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-bluefield (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux-bluefield (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2022370
Title:
mlxbf-gige: Fix kernel panic at shutdown
Status in linux-bluefield package in Ubuntu:
Invalid
Status in linux-bluefield source package in Focal:
New
Status in linux-bluefield source package in Jammy:
New
Bug description:
SRU Justification:
[Impact]
We occasionally see a race condition (once every 350 reboots) where napi is
still
running (mlxbf_gige_poll) while a shutdown has been initiated through
"reboot".
Since mlxbf_gige_poll is still running, it tries to access a NULL pointer and
as
a result causes a kernel panic.
[Fix]
The fix is to explicitly disable napi and dequeue it during shutdown.
mlxbf_gige_remove already calls:
unregister_netdev->unregister_netdevice->unregister_netdev_queue->
rollback_registered->rollback_registered_many->dev_close_many->
__dev_close_many->ndo_stop->mlxbf_gige_stop which stops napi
So use mlxbf_gige_remove in place of the existing shutdown logic.
[Test Case]
* Issue at least 1000 reboots from linux and make sure there is no
panic caused by the mlxbf-gige driver.
[Regression Potential]
* since this issue is hard to reproduce, it hasn't been tested
thoroughly yet. so it needs several reboot loops to validate it.
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