4.16.0-0.rc0.git9.1.fc28.x86_64 which is "linux-next" git f9f1e414128e

[    9.523799] switcheroo-cont/889 is trying to acquire lock:
[    9.523799]  (console_lock){+.+.}, at: [<000000002c1cc7fb>] vga_switchto_stage2+0x93/0x130
[    9.523806] 
               but task is already holding lock:
[    9.523807]  (vgasr_mutex){+.+.}, at: [<000000007e504e29>] vga_switcheroo_debugfs_write+0x6b/0x360
[    9.523810] 
               which lock already depends on the new lock.

[    9.523810] 
               the existing dependency chain (in reverse order) is:
[    9.523810] 
               -> #3 (vgasr_mutex){+.+.}:
[    9.523812] 
               -> #2 (&helper->lock){+.+.}:
[    9.523814] 
               -> #1 ((fb_notifier_list).rwsem){++++}:
[    9.523816] 
               -> #0 (console_lock){+.+.}:
[    9.523818] 
               other info that might help us debug this:

[    9.523818] Chain exists of:
                 console_lock --> &helper->lock --> vgasr_mutex