------------[ cut here ]------------
memory commitment underflow
WARNING: CPU: 0 PID: 19555 at mm/util.c:606 __vm_enough_memory+0x5a6/0x810 mm/util.c:604
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 19555 Comm: syz-executor4 Not tainted 4.15.0-rc9+ #276
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
device eql entered promiscuous mode
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1096
RIP: 0010:__vm_enough_memory+0x5a6/0x810 mm/util.c:604
RSP: 0018:ffff8801c184eef8 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: 1ffff10038309de4 RCX: ffffffff8159ebae
RDX: 000000000000195c RSI: ffffc900038e7000 RDI: 0000000000000212
RBP: ffff8801c184f0a8 R08: 1ffff10038309d5c R09: 0000000000000000
R10: ffff8801c184ebe0 R11: 0000000000000000 R12: ffff8801c184f080
R13: ffffffff869b7660 R14: 0000000000000001 R15: dffffc0000000000
 security_vm_enough_memory_mm+0x90/0xb0 security/security.c:327
 shmem_acct_block mm/shmem.c:182 [inline]
 shmem_inode_acct_block mm/shmem.c:197 [inline]
 shmem_alloc_and_acct_page+0x34f/0x740 mm/shmem.c:1481
 shmem_getpage_gfp+0x61f/0x3730 mm/shmem.c:1762
 shmem_getpage mm/shmem.c:131 [inline]
 shmem_write_begin+0xf7/0x1a0 mm/shmem.c:2370
 generic_perform_write+0x28f/0x600 mm/filemap.c:3139
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3264
 generic_file_write_iter+0x399/0x790 mm/filemap.c:3292
 call_write_iter include/linux/fs.h:1772 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fe37f5f5c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000000000030 RSI: 0000000020011fd2 RDI: 0000000000000015
RBP: 00000000000003d6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4cb0
R13: 00000000ffffffff R14: 00007fe37f5f66d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..