On Mon, Oct 28, 2024 at 11:51:49AM +0100, Pierre Gondois wrote:
> The following BUG was triggered. sugov_update_shared() locks a
> raw_spinlock while cpc_write() locks a spinlock. To have a correct
> wait-type order, update rmw_lock to a raw_spinlock.
>
> Also save irq state.
>
> =============================
> [ BUG: Invalid wait context ]
> 6.12.0-rc2-XXX #406 Not tainted
> -----------------------------
> kworker/1:1/62 is trying to lock:
> ffffff8801593030 (&cpc_ptr->rmw_lock){+.+.}-{3:3}, at: cpc_write+0xcc/0x370
> other info that might help us debug this:
> context-{5:5}
> 2 locks held by kworker/1:1/62:
> #0: ffffff897ef5ec98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x50
> #1: ffffff880154e238 (&sg_policy->update_lock){....}-{2:2}, at: sugov_update_shared+0x3c/0x280
> stack backtrace:
> CPU: 1 UID: 0 PID: 62 Comm: kworker/1:1 Not tainted 6.12.0-rc2-g9654bd3e8806 #406
> Workqueue: 0x0 (events)
> Call trace:
> dump_backtrace+0xa4/0x130
> show_stack+0x20/0x38
> dump_stack_lvl+0x90/0xd0
> dump_stack+0x18/0x28
> __lock_acquire+0x480/0x1ad8
> lock_acquire+0x114/0x310
> _raw_spin_lock+0x50/0x70
> cpc_write+0xcc/0x370
> cppc_set_perf+0xa0/0x3a8
> cppc_cpufreq_fast_switch+0x40/0xc0
> cpufreq_driver_fast_switch+0x4c/0x218
> sugov_update_shared+0x234/0x280
> update_load_avg+0x6ec/0x7b8
> dequeue_entities+0x108/0x830
> dequeue_task_fair+0x58/0x408
> __schedule+0x4f0/0x1070
> schedule+0x54/0x130
> worker_thread+0xc0/0x2e8
> kthread+0x130/0x148
> ret_from_fork+0x10/0x20
>
> Fixes: 60949b7b8054 ("ACPI: CPPC: Fix MASK_VAL() usage")
> Signed-off-by: Pierre Gondois <pierre.gondois@xxxxxxx>
> ---
> drivers/acpi/cppc_acpi.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created. Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.
You are receiving this message because of the following common error(s)
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- You have marked a patch with a "Fixes:" tag for a commit that is in an
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applied to any older kernel releases. To properly fix this, please
follow the documented rules in the
Documentation/process/stable-kernel-rules.rst file for how to resolve
this.
If you wish to discuss this problem further, or you have questions about
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Greg will reply once he has dug out from the pending patches received
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thanks,
greg k-h's patch email bot
