linux-kernel - Re: system hung up when offlining CPUs

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Date:   Tue, 3 Oct 2017 23:44:33 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     YASUAKI ISHIMATSU <yasu.isimatu@...il.com>
cc:     Kashyap Desai <kashyap.desai@...adcom.com>,
        Hannes Reinecke <hare@...e.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoph Hellwig <hch@....de>, axboe@...nel.dk,
        mpe@...erman.id.au, keith.busch@...el.com, peterz@...radead.org,
        LKML <linux-kernel@...r.kernel.org>, linux-scsi@...r.kernel.org,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan Srikanteshwara 
        <shivasharan.srikanteshwara@...adcom.com>
Subject: Re: system hung up when offlining CPUs

On Mon, 2 Oct 2017, YASUAKI ISHIMATSU wrote:
> On 09/16/2017 11:02 AM, Thomas Gleixner wrote:
> > Which driver are we talking about?
> 
> We are talking about megasas driver.

Can you please apply the debug patch below.

After booting enable stack traces for the tracer:

# echo 1 >/sys/kernel/debug/tracing/options/stacktrace

Then offline CPUs 24-29. After that do

# cat /sys/kernel/debug/tracing/trace >somefile

Please compress the file and upload it to some place or if you have no place
to upload it then send it to me in private mail.

Thanks,

	tglx

8<------------
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -171,11 +171,16 @@ void irq_set_thread_affinity(struct irq_
 int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
 			bool force)
 {
+	const struct cpumask *eff = irq_data_get_effective_affinity_mask(data);
 	struct irq_desc *desc = irq_data_to_desc(data);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
 	int ret;
 
 	ret = chip->irq_set_affinity(data, mask, force);
+
+	trace_printk("irq: %u ret %d mask: %*pbl eff: %*pbl\n", data->irq, ret,
+		     cpumask_pr_args(mask), cpumask_pr_args(eff));
+
 	switch (ret) {
 	case IRQ_SET_MASK_OK:
 	case IRQ_SET_MASK_OK_DONE: