==================================================================
BUG: KASAN: use-after-free in fast_dput fs/dcache.c:717 [inline]
BUG: KASAN: use-after-free in dput.part.26+0x634/0x7a0 fs/dcache.c:836
Read of size 4 at addr ffff8801d5342b80 by task syz-executor1/17056

CPU: 1 PID: 17056 Comm: syz-executor1 Not tainted 4.18.0-rc6-next-20180725+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 ? dump_stack_print_in