linux-kernel - Re: [patch 00/14] x86/irq: Plug various vector cleanup races

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Date:	Fri, 22 Jan 2016 10:28:18 -0500
From:	Joe Lawrence <joe.lawrence@...atus.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jeremiah Mahler <jmmahler@...il.com>,
	<andy.shevchenko@...il.com>, Guenter Roeck <linux@...ck-us.net>
Subject: Re: [patch 00/14] x86/irq: Plug various vector cleanup races

On 01/20/2016 03:26 AM, Borislav Petkov wrote:
> ... tglx says you could also try enabling
> CONFIG_DEBUG_OBJECTS and CONFIG_DEBUG_OBJECTS_TIMERS and collect full
> dmesg from when the corruption happens. That might give us some more
> insights as to what happens.

Hi Boris,

Excellent idea.  With CONFIG_DEBUG_OBJECTS_FREE=y  I've hit this twice:

ODEBUG: free active (active state 0) object type: timer_list hint:
xhci_stop_endpoint_command_watchdog+0x0/0x2b0

So I'll try to hunt that down on the xHCI side and report over to
linux-usb.  Sorry for the unrelated noise on this patch -- my guess is
that timing changed just enough for the xHCI driver to hit this. :)

-- Joe