Connecting to a PC while recording causes a crash and loss of the recording.

Salutation: this Rockbox is some pretty awesome software!

Hardware: Sansa Clip Zip, AMSv2 variant 1
Software: boot 4.0; 515a3c5-140924, and others

Scenario:

Start a recording. While this runs, connect a USB cable and connect to a 
PC. The connection will cause a PANIC message:

----------------
  *PANIC*
  usb_storage_in
  it_connection(
  ): OOM
pc:30065CA0 sp:3
     A: 30063E2C
     A: 300643E4
     A: 3004DA18
bt end
----------------

The file that was being recorded will not exist after the panic (a 
chkdsk or similar may be able to recover a fragment).

Encountering this is likely if you routinely use the recording feature 
in a busy environment, since when the display is timed out the device 
appears off (assuming you don't have headphones connected to monitor the 
recording). If you're not mindful, you may forget about the last 
recording you'd started, and plug the unit into your PC before properly 
ending the recording (I lost an important lecture this way, doh!).

Perhaps a routine needs to be added which checks for an active recording 
and ends it before initializing the USB link, or perhaps brings up the 
display and leaves the link down for that connection, similar to the way 
USB behaves when you've entered [System->Debug (Keep Out)->Battery] 
before connecting (i.e. the link with the PC stays off, but the unit 
goes about charging).

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