Hi, On Sun, Aug 4, 2019 at 11:48 PM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > > On Sun, Aug 04, 2019 at 09:31:43PM +0100, Al Viro wrote: > > > FWIW, the following reproduces the deadlock on mainline: > > > > dd if=/dev/zero of=/tmp/image bs=1M count=20 > > modprobe dummy_hcd > > modprobe configfs > > mount -t configfs none /sys/kernel/config > > modprobe g_mass_storage file=/tmp/image ro=y > > cd /sys/kernel/config/usb_gadget/ > > mkdir blah > > cd blah/configs > > mkdir foo.1 > > cd foo.1 > > ln -s /sys/kernel/config/usb_gadget/blah/configs/foo.1/no-such-dir/ barf > > So does the following, actually - mass_storage is irrelevant here; it just > brings libcomposite in. > > modprobe dummy_hcd > modprobe libcomposite > mount -t configfs none /sys/kernel/config > cd /sys/kernel/config/usb_gadget/ > mkdir blah > cd blah/configs > mkdir foo.1 > cd foo.1 > ln -s /sys/kernel/config/usb_gadget/blah/configs/foo.1/no-such-dir/ barf I'll try to reproduce on my end. Added linux-usb to the loop -- balbi
