Freezing of tasks failed ... *0* tasks refusing to freeze, wq_busy=1)

[Eric Valette]

I have a NAS system that does supend itslef when rx/tx counts drops 
below a level meaning no activity...

The last working kernel was 3.14.58, any thing longterm after that 
refuse to freeze after a while with:


[ 9692.905439] ehci-pci 0000:00:1d.0: remove, state 1
[ 9692.905448] usb usb4: USB disconnect, device number 1
[ 9692.905451] usb 4-1: USB disconnect, device number 2
[ 9692.905453] usb 4-1.2: USB disconnect, device number 3
[ 9692.913779] ehci-pci 0000:00:1d.0: USB bus 4 deregistered
[ 9692.913950] ehci-pci 0000:00:1a.0: remove, state 4
[ 9692.913957] usb usb1: USB disconnect, device number 1
[ 9692.913959] usb 1-1: USB disconnect, device number 2
[ 9692.918351] ehci-pci 0000:00:1a.0: USB bus 1 deregistered
[ 9693.227548] PM: Syncing filesystems ... done.
[ 9693.357287] Freezing user space processes ... (elapsed 0.001 seconds) 
done.
[ 9693.358563] Freezing remaining freezable tasks ...
[ 9713.363844] Freezing of tasks failed after 20.015 seconds (0 tasks 
refusing to freeze, wq_busy=1): <<==== 0)???

[ 9713.363921] Restarting kernel threads ... done.
[ 9713.363956] Restarting tasks ... done.
[ 9713.496684] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 9713.496787] ehci-pci: EHCI PCI platform driver
[ 9713.496902] ehci-pci 0000:00:1a.0: EHCI Host Controller
[ 9713.496908] ehci-pci 0000:00:1a.0: new USB bus registered, assigned 
bus number 1
[ 9713.496921] ehci-pci 0000:00:1a.0: debug port 2
[ 9713.500878] ehci-pci 0000:00:1a.0: cache line size of 64 is not supported
[ 9713.500890] ehci-pci 0000:00:1a.0: irq 16, io mem 0xfe707000
[ 9713.517601] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00
[ 9713.518144] hub 1-0:1.0: USB hub found
[ 9713.518191] hub 1-0:1.0: 2 ports detected
[ 9713.567741] ehci-pci 0000:00:1d.0: EHCI Host Controller
[ 9713.567750] ehci-pci 0000:00:1d.0: new USB bus registered, assigned 
bus number 4
[ 9713.567765] ehci-pci 0000:00:1d.0: debug port 2
[ 9713.571674] ehci-pci 0000:00:1d.0: cache line size of 64 is not supported
[ 9713.571692] ehci-pci 0000:00:1d.0: irq 23, io mem 0xfe706000
[ 9713.587580] ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00
[ 9713.588260] hub 4-0:1.0: USB hub found
[ 9713.588307] hub 4-0:1.0: 2 ports detected
[ 9713.837399] usb 1-1: new high-speed USB device number 2 using ehci-pci
[ 9713.907412] usb 4-1: new high-speed USB device number 2 using ehci-pci
[ 9713.988167] hub 1-1:1.0: USB hub found
[ 9713.988384] hub 1-1:1.0: 6 ports detected
[ 9714.058113] hub 4-1:1.0: USB hub found
[ 9714.058307] hub 4-1:1.0: 8 ports detected
[ 9714.267224] usb 1-1.1: new full-speed USB device number 3 using ehci-pci
[ 9714.337189] usb 4-1.2: new high-speed USB device number 3 using ehci-pci

Freezing user space processes ... (elapsed 0.001 seconds) done.
[ 9693.358563] Freezing remaining freezable tasks ...
[ 9713.363844] Freezing of tasks failed after 20.015 seconds (0 tasks 
refusing to freeze, wq_busy=1):

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