[2.6.21.4]: possible recursive locking detected

I found below call trace today morning in dmesg output on one of my test computer: = [ INFO: possible recursive locking detected ] 2.6.21.4-2.1 #1 - usb-storage/1806 is trying to acquire lock:

[2.6.21.4]: possible recursive locking detected

I found below call trace today morning in dmesg output on one of my test computer: = [ INFO: possible recursive locking detected ] 2.6.21.4-2.1 #1 - usb-storage/1806 is trying to acquire lock: