Hi Ross,
On my dom0 with a linux 4.2-rc5 kernel i encoutered the splat below.
It's probably related to your patch that went in just for 4.2-rc5:
"xen/events/fifo: Handle linked events when closing a port"
--
Sander
[ 49.020173] ------------[ cut here ]------------
[ 49.020187] WARNING: CPU: 0 PID: 1 at
drivers/xen/events/events_fifo.c:395 evtchn_fifo_close+0xbd/0xc0()
[ 49.020191] Modules linked in:
[ 49.020198] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
4.2.0-rc5-20150804-linus-doflr+ #1
[ 49.020200] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS
V1.8B1 09/13/2010
[ 49.020208] ffffffff81faaae8 ffff880059b9bad8 ffffffff81aed513
0000000000000000
[ 49.020214] 0000000000000000 ffff880059b9bb18 ffffffff810c7280
0000000000000041
[ 49.020219] 0000000000000041 0000000000000000 ffff880059807ca8
ffff880059807c00
[ 49.020220] Call Trace:
[ 49.020233] [<ffffffff81aed513>] dump_stack+0x45/0x57
[ 49.020240] [<ffffffff810c7280>] warn_slowpath_common+0x80/0xc0
[ 49.020245] [<ffffffff810c7365>] warn_slowpath_null+0x15/0x20
[ 49.020249] [<ffffffff814f1b9d>] evtchn_fifo_close+0xbd/0xc0
[ 49.020278] [<ffffffff814eeabd>] xen_evtchn_close+0x1d/0x60
[ 49.020281] [<ffffffff811055f9>] ? irq_get_irq_data+0x9/0x20
[ 49.020282] [<ffffffff814ef9eb>] shutdown_pirq+0x4b/0x70
[ 49.020283] [<ffffffff81105be4>] irq_shutdown+0x34/0x70
[ 49.020285] [<ffffffff811034ed>] __free_irq+0x19d/0x1e0
[ 49.020286] [<ffffffff811035b8>] free_irq+0x48/0xb0
[ 49.020287] [<ffffffff8234f3ec>] i8042_probe+0x38f/0x693
[ 49.020291] [<ffffffff816800cf>] platform_drv_probe+0x2f/0x90
[ 49.020292] [<ffffffff8167e3ff>] driver_probe_device+0x1af/0x2d0
[ 49.020293] [<ffffffff8167e5ab>] __driver_attach+0x8b/0x90
[ 49.020294] [<ffffffff8167e520>] ? driver_probe_device+0x2d0/0x2d0
[ 49.020296] [<ffffffff8167c5bf>] bus_for_each_dev+0x5f/0x90
[ 49.020297] [<ffffffff8167df09>] driver_attach+0x19/0x20
[ 49.020298] [<ffffffff8167db5b>] bus_add_driver+0x1ab/0x220
[ 49.020299] [<ffffffff8167ee0b>] driver_register+0x5b/0xe0
[ 49.020300] [<ffffffff81680035>]
__platform_driver_register+0x45/0x50
[ 49.020301] [<ffffffff81680241>] __platform_driver_probe+0x31/0xe0
[ 49.020303] [<ffffffff81680663>] __platform_create_bundle+0xa3/0xd0
[ 49.020304] [<ffffffff8234f05d>] ? i8042_toggle_aux+0x6c/0x6c
[ 49.020305] [<ffffffff8234f6f0>] ? i8042_probe+0x693/0x693
[ 49.020306] [<ffffffff8234fac0>] i8042_init+0x3d0/0x3f6
[ 49.020308] [<ffffffff810020f7>] do_one_initcall+0x87/0x1d0
[ 49.020310] [<ffffffff82313147>] kernel_init_freeable+0x1db/0x263
[ 49.020312] [<ffffffff81ae7610>] ? rest_init+0x80/0x80
[ 49.020314] [<ffffffff81ae7619>] kernel_init+0x9/0xe0
[ 49.020315] [<ffffffff81af7d1f>] ret_from_fork+0x3f/0x70
[ 49.020317] [<ffffffff81ae7610>] ? rest_init+0x80/0x80
[ 49.020320] ---[ end trace 64c385518fcbbfa1 ]---
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