------------[ cut here ]------------
WARNING: CPU: 1 PID: 854 at mm/util.c:522 __vm_enough_memory+0x38b/0x470 mm/util.c:520
memory commitment underflow[  174.988041] Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 854 Comm: syz-executor1 Not tainted 4.9.77-ge12a9c4 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d1a47a30 ffffffff81d941c9 ffffffff83a47bc0 ffff8801d1a47b08
 ffffffff83aac800 ffffffff81498b0b 0000000000000009 ffff8801d1a47af8
 ffffffff8142f3c1 0000000041b58ab3 ffffffff8418ab70 ffffffff8142f205
Call Trace:
 [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f3c1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131144>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff81131224>] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565
 [<ffffffff81498b0b>] __vm_enough_memory+0x38b/0x470 mm/util.c:520
 [<ffffffff81bd00f0>] security_vm_enough_memory_mm+0x90/0xb0 security/security.c:238
 [<ffffffff814e700b>] mmap_region+0x93b/0xfd0 mm/mmap.c:1644
 [<ffffffff814e7c1b>] do_mmap+0x57b/0xbe0 mm/mmap.c:1473
 [<ffffffff814983db>] do_mmap_pgoff include/linux/mm.h:2019 [inline]
 [<ffffffff814983db>] vm_mmap_pgoff+0x16b/0x1b0 mm/util.c:305
 [<ffffffff814e1cc0>] SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
 [<ffffffff814e1cc0>] SyS_mmap_pgoff+0xd0/0x560 mm/mmap.c:1481
 [<ffffffff8105f306>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 [<ffffffff8105f306>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
 [<ffffffff838b2c2e>] entry_SYSCALL_64_fastpath+0x29/0xe8
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..