------------[ cut here ]------------
memory commitment underflow
WARNING: CPU: 1 PID: 5237 at mm/util.c:642 __vm_enough_memory+0x753/0x980 mm/util.c:640
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 5237 Comm: syz-executor0 Not tainted 4.18.0-rc6+ #163
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