linux-kernel - Re: [tj-wq:affinity-scopes-dbg-invalid-cpu] [workqueue] e3485721f9: WARNING:at_kernel/workqueue.c:#workqueue_online

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 12 Jun 2023 07:42:11 -1000
From:   Tejun Heo <tj@...nel.org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [tj-wq:affinity-scopes-dbg-invalid-cpu] [workqueue] e3485721f9:
 WARNING:at_kernel/workqueue.c:#workqueue_online_cpu

On Mon, Jun 12, 2023 at 10:04:02AM +0800, kernel test robot wrote:
> [    3.388228][   T21] ------------[ cut here ]------------
> [ 3.394990][ T21] WARNING: CPU: 1 PID: 21 at kernel/workqueue.c:5393 workqueue_online_cpu (kernel/workqueue.c:5393 kernel/workqueue.c:5481) 
...
> [ 3.584746][ T21] ? workqueue_prepare_cpu (kernel/workqueue.c:5470) 
> [ 3.591752][ T21] ? local_clock (kernel/sched/clock.c:270 kernel/sched/clock.c:307) 
> [ 3.596749][ T21] cpuhp_invoke_callback (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:207 include/trace/events/cpuhp.h:65 kernel/cpu.c:193) 
> [ 3.603751][ T21] ? try_to_wake_up (include/linux/sched.h:2254 kernel/sched/core.c:4312) 
> [ 3.610751][ T21] cpuhp_thread_fun (kernel/cpu.c:815) 

This is set_cpus_allowed_ptr() failing on kworkers when workqueue tries to
put back the per-cpu kworkers on the onlining CPU, which is rather
unexpected. Let me include the error code in the warning message so that we
can understand why it fails the next time.

Thanks.

-- 
tejun