bisecting fixing commit since 68d7a45eec101bc1550294c0e675a490c047b2e5
building syzkaller on 53199d6e8aee5f0ebd3775d2b1c674f4e6e64e2b
testing commit 68d7a45eec101bc1550294c0e675a490c047b2e5 with gcc (GCC) 8.1.0
kernel signature: 00432890b578c5dfe54b85eeb08cf8deee09a2e8
all runs: crashed: WARNING in __vm_enough_memory
testing current HEAD 43598c571e7ed29e4c81e35b4a870fe6b9f8d58e
testing commit 43598c571e7ed29e4c81e35b4a870fe6b9f8d58e with gcc (GCC) 8.1.0
kernel signature: 2402cb640d5dbe67f52e81296b36d8dc2da10455
all runs: crashed: WARNING in __vm_enough_memory
revisions tested: 2, total time: 24m25.763715503s (build: 17m12.951564467s, test: 6m17.500762387s)
the crash still happens on HEAD
commit msg: Linux 4.14.156
crash: WARNING in __vm_enough_memory
memory commitment underflow
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
WARNING: CPU: 1 PID: 6835 at mm/util.c:606 __vm_enough_memory.cold.5+0x13/0x62 mm/util.c:604
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6835 Comm: syz-executor.1 Not tainted 4.14.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 panic+0x1b0/0x36a kernel/panic.c:183
 __warn.cold.8+0x25/0x2a kernel/panic.c:547
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
 report_bug+0x1a4/0x1f3 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:__vm_enough_memory.cold.5+0x13/0x62 mm/util.c:604
RSP: 0018:ffff88807fb7fbb0 EFLAGS: 00010282
RAX: 000000000000001b RBX: ffffffff87a05a40 RCX: 0000000000000000
RDX: 000000000000001b RSI: ffff8880758b4f80 RDI: ffffed100ff6ff6d
RBP: ffff88807fb7fbe8 R08: ffff8880758b4fa0 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000021
R13: 0000000000000001 R14: ffff88809690b940 R15: fff80000000126b7
 security_vm_enough_memory_mm+0x80/0xa0 security/security.c:328
 mmap_region+0x1d4/0xfa0 mm/mmap.c:1673
 do_mmap+0x544/0xe20 mm/mmap.c:1501
 do_mmap_pgoff include/linux/mm.h:2173 [inline]
 vm_mmap_pgoff+0x181/0x200 mm/util.c:333
 SYSC_mmap_pgoff mm/mmap.c:1551 [inline]
 SyS_mmap_pgoff+0x9d/0x6b0 mm/mmap.c:1509
 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x1c9/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c7a
RSP: 002b:00007ffd481e9ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c7a
RDX: 0000000000000003 RSI: 0000000000021000 RDI: 0000000000000000
RBP: ffffffffffffffff R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000021000 R14: 0000000000020022 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..