syzbot

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memory commitment underflow
WARNING: CPU: 0 PID: 7947 at mm/util.c:657 __vm_enough_memory+0x47b/0x5a0 mm/util.c:657
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7947 Comm: syz-executor945 Not tainted 5.1.0-rc6 #80
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x45 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__vm_enough_memory+0x47b/0x5a0 mm/util.c:657
Code: e8 aa 79 da ff 0f b6 75 d0 40 84 f6 0f 85 50 fc ff ff e8 58 78 da ff 48 c7 c7 60 7c 72 87 c6 05 2f 73 c4 07 01 e8 03 26 ad ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 0f b6 14
RSP: 0018:ffff888093cffa60 EFLAGS: 00010282
RAX: 0000000000000000 RBX: fff8000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815afcf6 RDI: ffffed101279ff3e
RBP: ffff888093cffa98 R08: ffff8880a96943c0 R09: ffff8880a9694c88
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880a8a75200 R14: ffffffff88a2a580 R15: 0000000000000c67
 security_vm_enough_memory_mm+0xa0/0xd0 security/security.c:739
 shmem_acct_size mm/shmem.c:157 [inline]
 __shmem_file_setup.part.0+0x194/0x2b0 mm/shmem.c:3982
 __shmem_file_setup mm/shmem.c:3979 [inline]
 shmem_file_setup+0x66/0x90 mm/shmem.c:4026
 ashmem_mmap+0x35f/0x520 drivers/staging/android/ashmem.c:389
 call_mmap include/linux/fs.h:1871 [inline]
 mmap_region+0xc3a/0x1770 mm/mmap.c:1787
 do_mmap+0x8e2/0x1080 mm/mmap.c:1560
 do_mmap_pgoff include/linux/mm.h:2348 [inline]
 vm_mmap_pgoff+0x1c5/0x230 mm/util.c:362
 ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1610
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441319
Code: e8 6c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc7d110a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441319
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020ffc000
RBP: 00000000006cc018 R08: 0000000000000003 R09: 0000000000000000
R10: 0080000000000012 R11: 0000000000000246 R12: 0000000000402170
R13: 0000000000402200 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..