On 30/04/26 8:30 pm, Paul E. McKenney wrote:
On Thu, Apr 30, 2026 at 11:49:02AM +0530, Samir M wrote:
On 29/04/26 11:21 pm, Shrikanth Hegde wrote:
Hi Samir.
On 4/29/26 3:46 PM, Samir M wrote:
Hi Boqun,
Thank you for pointing me to the existing patches. I have tested
both Paul's patch [1] and TJ's workqueue patch [2] on my PowerPC
system (80 CPUs), and can confirm that the workqueue lockup issue is
not observed.
Can you try only paul's patch and confirm if the issue is fixed?
Hi Shrikanth,
I have verified Paul’s “alone” patch, and it resolves the issue no workqueue
lockups are observed.
Thank you, Samir! May I add your Tested-by?
Thanx, Paul
Hi Paul,
Yes, you may add:
Tested-by: Samir <[email protected]>
Thanks,
Samir
Regards,
Samir.
Test Environment:
- System: PowerPC with 80 CPUs ( e.g. PowerPC LPARs with 80 online
and 384 possible CPUs)
- Kernel version: Latest upstream (7.1-rc1)
Regression Testing Results:
All tests completed successfully with no issues observed:
- Hackbench
- Kernel selftests
- LTP scheduler tests
The workqueue lockup that was previously occurring is no longer
present with the patches applied.
References:
[1]: https://lore.kernel.org/rcu/ed1fa6cd-7343-4ca3-8b9d-
d699ca496f83@paulmck-laptop/
[2]: https://lore.kernel.org/rcu/[email protected]/
Best regards,
Samir
