==================================================================
BUG: KASAN: use-after-free in __atomic_add_unless include/asm-generic/atomic-instrumented.h:89 [inline]
BUG: KASAN: use-after-free in atomic_add_unless include/linux/atomic.h:533 [inline]
BUG: KASAN: use-after-free in dst_hold_safe include/net/dst.h:308 [inline]
BUG: KASAN: use-after-free in ip6_hold_safe+0xbe/0x440 net/ipv6/route.c:1029
Write of size 4 at addr ffff88019cabf600 by task syz-executor5/24913

CPU: 1 PID: 24913 Comm: syz-executor5 Not tainted 4.18.0-rc6+ #162
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_info.cold.2