linux-kernel - MEI-related WARN_ON() triggered during resume-from-sleep on v4.12-rc2+

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Date:   Sun, 30 Jul 2017 10:59:08 +0200
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     tomas.winkler@...el.com
Cc:     alexander.usyskin@...el.com, linux-kernel@...r.kernel.org
Subject: MEI-related WARN_ON() triggered during resume-from-sleep on
 v4.12-rc2+

Thomas,

on Linus' most recent kernel (v4.12-rc2, git head 0a07b238e5f48), I see the
following message on my Dell XPS13 when resuming from sleep. MEI is, AFAIK,
not being used on this system:

[  192.940537] Restarting tasks ... 
[  192.940610] PGI is not set
[  192.940619] ------------[ cut here ]------------
[  192.940623] WARNING: CPU: 0 PID: 1661 at /home/brodo/local/kernel/git/linux/drivers/misc/mei/hw-me.c:653 mei_me_pg_exit_sync+0x351/0x360
[  192.940624] Modules linked in:
[  192.940627] CPU: 0 PID: 1661 Comm: kworker/0:3 Not tainted 4.13.0-rc2+ #2
[  192.940628] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A11 12/08/2016
[  192.940630] Workqueue: pm pm_runtime_work
<snip>
[  192.940642] Call Trace:
[  192.940646]  ? pci_pme_active+0x1de/0x1f0
[  192.940649]  ? pci_restore_standard_config+0x50/0x50
[  192.940651]  ? kfree+0x172/0x190
[  192.940653]  ? kfree+0x172/0x190
[  192.940655]  ? pci_restore_standard_config+0x50/0x50
[  192.940663]  mei_me_pm_runtime_resume+0x3f/0xc0
[  192.940665]  pci_pm_runtime_resume+0x7a/0xa0
[  192.940667]  __rpm_callback+0xb9/0x1e0
[  192.940668]  ? preempt_count_add+0x6d/0xc0
[  192.940670]  rpm_callback+0x24/0x90
[  192.940672]  ? pci_restore_standard_config+0x50/0x50
[  192.940674]  rpm_resume+0x4e8/0x800
[  192.940676]  pm_runtime_work+0x55/0xb0
[  192.940678]  process_one_work+0x184/0x3e0
[  192.940680]  worker_thread+0x4d/0x3a0
[  192.940681]  ? preempt_count_sub+0x9b/0x100
[  192.940683]  kthread+0x122/0x140
[  192.940684]  ? process_one_work+0x3e0/0x3e0
[  192.940685]  ? __kthread_create_on_node+0x1a0/0x1a0
[  192.940688]  ret_from_fork+0x27/0x40
[  192.940690] Code: 96 3a 9e ff 48 8b 7d 98 e8 cd 21 58 00 83 bb bc 01 00 00 04 0f 85 40 fe ff ff e9 41 fe ff ff 48 c7 c7 5f 04 99 96 e8 93 6b 9f ff <0f> ff e9 5d fd ff ff e8 33 fe 99 ff 0f 1f 00 0f 1f 44 00 00 55 
[  192.940719] ---[ end trace a86955597774ead8 ]---
[  192.942540] done.

This doesn't / didn't happen on v4.12.

Best,
	Dominik

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