linux-kernel - RE: [PATCH v3 0/8] thunderbolt: Intel Ice Lake support

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Message-ID: <b5db55608d944b95a58cdfc7ccb60b69@AUSX13MPC101.AMER.DELL.COM>
Date:   Tue, 20 Aug 2019 17:00:11 +0000
From:   <Mario.Limonciello@...l.com>
To:     <lukas@...ner.de>
CC:     <mika.westerberg@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
        <andreas.noever@...il.com>, <michael.jamet@...el.com>,
        <YehezkelShB@...il.com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
        <anthony.wong@...onical.com>, <rajmohan.mani@...el.com>,
        <raanan.avargil@...el.com>, <David.Laight@...LAB.COM>,
        <linux-acpi@...r.kernel.org>
Subject: RE: [PATCH v3 0/8] thunderbolt: Intel Ice Lake support

> -----Original Message-----
> From: Lukas Wunner <lukas@...ner.de>
> Sent: Tuesday, August 20, 2019 6:34 AM
> To: Limonciello, Mario
> Cc: mika.westerberg@...ux.intel.com; linux-kernel@...r.kernel.org;
> andreas.noever@...il.com; michael.jamet@...el.com;
> YehezkelShB@...il.com; rjw@...ysocki.net; lenb@...nel.org;
> anthony.wong@...onical.com; rajmohan.mani@...el.com;
> raanan.avargil@...el.com; David.Laight@...LAB.COM; linux-
> acpi@...r.kernel.org
> Subject: Re: [PATCH v3 0/8] thunderbolt: Intel Ice Lake support
> 
> 
> [EXTERNAL EMAIL]
> 
> On Mon, Aug 19, 2019 at 04:29:35PM +0000, Mario.Limonciello@...l.com wrote:
> > I've run into a problem when using
> > a WD19TB that after unplugging it will cause the following to spew in dmesg:
> >
> > [ 2198.017003] ============================================
> > [ 2198.017005] WARNING: possible recursive locking detected
> > [ 2198.017008] 5.3.0-rc5+ #75 Not tainted
> > [ 2198.017009] --------------------------------------------
> > [ 2198.017012] irq/122-pciehp/121 is trying to acquire lock:
> > [ 2198.017015] 00000000801d4de8 (&ctrl->reset_lock){.+.+}, at:
> pciehp_check_presence+0x1b/0x80
> > [ 2198.017026]
> >                but task is already holding lock:
> > [ 2198.017028] 000000000899e2eb (&ctrl->reset_lock){.+.+}, at:
> pciehp_ist+0xaf/0x1c0
> 
> This was first reported by Theodore in April and appears to be a
> false positive:
> 
> https://lore.kernel.org/linux-
> pci/20190402083257.kyqmirq4ovzscxsv@...ner.de/
> 
> Thanks,
> 
> Lukas

Indeed it does actually seem harmless and only comes up once.

I've filed https://bugzilla.kernel.org/show_bug.cgi?id=204639 to track down further
what's going on.