Hello,

This turned up in 2.5.42-ac1.

Debug: sleeping function called from illegal context at include/asm/semaphore.h:119
Call Trace:
 [<c02ad282>] usb_hub_events+0x72/0x3b0
 [<c01155b3>] schedule+0x183/0x300
 [<c011a864>] reparent_to_init+0xe4/0x180
 [<c02ad5f5>] usb_hub_thread+0x35/0xf0
 [<c0115790>] default_wake_function+0x0/0x40
 [<c02ad5c0>] usb_hub_thread+0x0/0xf0
 [<c0105601>] kernel_thread_helper+0x5/0x14

Regards,
-Udo.