linux-kernel - [RT] Warning from swake_up_all

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Message-ID: <20160313225358.4eb9316a@sluggy.hsv.redhat.com>
Date:	Sun, 13 Mar 2016 22:53:58 -0500
From:	Clark Williams <williams@...hat.com>
To:	Daniel Wagner <wagi@...om.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	RT <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [RT] Warning from swake_up_all_locked in rt-4.4.4-rt11

I'm hitting the WARN_ON(wakes > 2) in $SUBJECT when resuming from suspend on my laptop (quad-core i7 with HT on). Looks like the warning gets hit 36 times on resume. E.g.:

Call Trace:
 [<ffffffff813c13c0>] dump_stack+0x65/0x85
 [<ffffffff810a7572>] warn_slowpath_common+0x82/0xd0
 [<ffffffff810a76ca>] warn_slowpath_null+0x1a/0x20
 [<ffffffff810ec8d8>] swake_up_all_locked+0x68/0x80
 [<ffffffff810ecd40>] complete_all+0x30/0x50
 [<ffffffff81506328>] device_resume_noirq+0x48/0x190
 [<ffffffff8150648d>] async_resume_noirq+0x1d/0x50
 [<ffffffff810ca188>] async_run_entry_fn+0x48/0x130
 [<ffffffff810c14a9>] process_one_work+0x139/0x480
 [<ffffffff810c1847>] worker_thread+0x57/0x490
 [<ffffffff810c17f0>] ? process_one_work+0x480/0x480
 [<ffffffff810c779d>] kthread+0xed/0x110
 [<ffffffff810c76b0>] ? kthread_worker_fn+0x150/0x150
ehci-pci 0000:00:1a.0: System wakeup disabled by ACPI
 [<ffffffff817b0d0f>] ret_from_fork+0x3f/0x70
 [<ffffffff810c76b0>] ? kthread_worker_fn+0x150/0x150
---[ end trace 0000000000000002 ]---



This trace (and a similar one with device_resume) happens on all cpus so the trace info is kinda jumbled up. I'll try it with WARN_ON_ONCE instead tomorrow. 

I'll send the console log if you want it. 

Clark

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