------------[ cut here ]------------
WARNING: CPU: 1 PID: 13379 at mm/util.c:546 __vm_enough_memory+0x37f/0x470 mm/util.c:544
memory commitment underflow[  148.408292] Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 13379 Comm: syz-executor6 Not tainted 4.9.99-gc462abb #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff88019b6c79e8 ffffffff81eb0f09 ffffffff83c484a0 00000000ffffffff
 0000000000000000 0000000000000001 0000000000000222 ffff88019b6c7aa8
 ffffffff8141f855 0000000041b58ab3 ffffffff843b86e8 ffffffff8141f696
Call Trace:
 [<ffffffff81eb0f09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0f09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8141f855>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff8141fb41>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff811344b2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81495f7f>] __vm_enough_memory+0x37f/0x470 mm/util.c:544
 [<ffffffff81cead56>] security_vm_enough_memory_mm+0x96/0xb0 security/security.c:238
 [<ffffffff814e2dc1>] mmap_region+0x5b1/0x1040 mm/mmap.c:1644
 [<ffffffff814e3d4a>] do_mmap+0x4fa/0xc30 mm/mmap.c:1473
 [<ffffffff81495868>] do_mmap_pgoff include/linux/mm.h:2032 [inline]
 [<ffffffff81495868>] vm_mmap_pgoff+0x168/0x1b0 mm/util.c:329
 [<ffffffff814dddb0>] SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
 [<ffffffff814dddb0>] SyS_mmap_pgoff+0xd0/0x550 mm/mmap.c:1481
 [<ffffffff8105e0f6>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
 [<ffffffff8105e0f6>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:87
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..