bisecting fixing commit since 106fa147d3daa58d2c1ae5f41a29d07036fe7d0a
building syzkaller on 2c2b926cb74478a86014f40564517f7d424dc899
testing commit 106fa147d3daa58d2c1ae5f41a29d07036fe7d0a with gcc (GCC) 8.4.1 20210217
kernel signature: df8618ea8c72fc3719e6b7586d86546a8b7919159cdcfe623774079fcdaec394
all runs: crashed: WARNING in __vm_enough_memory
testing current HEAD 255b58a2b3af0baa0ee11507390349217b8b73b0
testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217
kernel signature: 07576467a8969b1aadae663b18f0e4aafcc2cf97cf9644827b7890f12cec26ca
all runs: crashed: WARNING in __vm_enough_memory
revisions tested: 2, total time: 22m31.971747958s (build: 15m33.53821891s, test: 6m2.734388252s)
the crash still happens on HEAD
commit msg: Linux 4.19.176
crash: WARNING in __vm_enough_memory
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
------------[ cut here ]------------
memory commitment underflow
WARNING: CPU: 0 PID: 7188 at mm/util.c:670 __vm_enough_memory+0x3c3/0x4b0 mm/util.c:668
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7188 Comm: modprobe Not tainted 4.19.176-syzkaller #0
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+0x17c/0x226 lib/dump_stack.c:118
 panic+0x1cd/0x375 kernel/panic.c:186
 __warn.cold.7+0x1b/0x36 kernel/panic.c:541
 report_bug+0x1a1/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__vm_enough_memory+0x3c3/0x4b0 mm/util.c:668
Code: ea 02 48 29 d0 e9 3b ff ff ff 80 3d 11 d5 9c 07 00 0f 85 ec fc ff ff 48 c7 c7 e0 14 31 87 c6 05 fd d4 9c 07 01 e8 2c a0 3d 05 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 0f b6 14
RSP: 0018:ffff8881db7ef898 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffffff8860e100 RCX: 1ffff1103b11717d
RDX: 1ffffffff10a3f61 RSI: ffff8881d88b8bc8 RDI: 0000000000000286
RBP: ffff8881db7ef8d0 R08: ffff8881d88b8be8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
R13: ffff8881d890a200 R14: 0000000000000001 R15: fff8000000019e0b
 security_vm_enough_memory_mm+0x72/0x90 security/security.c:334
 mmap_region+0x699/0x1470 mm/mmap.c:1709
 do_mmap+0x673/0xe90 mm/mmap.c:1530
 do_mmap_pgoff include/linux/mm.h:2326 [inline]
 vm_mmap_pgoff+0x195/0x210 mm/util.c:357
 vm_mmap+0x30/0x40 mm/util.c:376
 elf_map+0xc7/0x2a0 fs/binfmt_elf.c:378
 load_elf_interp fs/binfmt_elf.c:587 [inline]
 load_elf_binary+0x175a/0x5120 fs/binfmt_elf.c:1087
 search_binary_handler fs/exec.c:1668 [inline]
 search_binary_handler+0x12b/0x630 fs/exec.c:1646
 exec_binprm fs/exec.c:1710 [inline]
 __do_execve_file.isra.12+0x1070/0x1d30 fs/exec.c:1832
 do_execveat_common fs/exec.c:1879 [inline]
 do_execve+0x20/0x30 fs/exec.c:1896
 call_usermodehelper_exec_async+0x49b/0x630 kernel/umh.c:116
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..