can't access MTP device : nothing displayed, successfull access using pcmanfm-qt

[jlmxyz]

I connected in the past using file managers to mtp device, but now I want to perform some sync accross folder, so I need a regular filesystem access

the device is correctly working with pcmanfm-qt, with libmtp support

but when I try with mtpfs I only get the following:

mtpfs media/mtp/
Listing raw device(s)
Device 0 (VID=04e8 and PID=6860) is a Samsung Galaxy models (MTP).
   Found 1 device(s):
   Samsung: Galaxy models (MTP) (04e8:6860) @ bus 2, dev 7
Attempting to connect device
Android device detected, assigning default bug flags

nothing is outputed when ls media/mtp I can´t find how to have more debug information
thanks and regards

[jlmxyz]

here is a strace dump, seems endless looping on USBDEVFS_REAPURBNDELAY
mtpfs.strace.log