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BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge

write to 0xffff88812bd0f6a0 of 8 bytes by task 24113 on cpu 1:
 page_counter_try_charge+0x23d/0x480 mm/page_counter.c:134
 __hugetlb_cgroup_charge_cgroup+0x1f7/0x430 mm/hugetlb_cgroup.c:258
 hugetlb_cgroup_charge_cgroup_rsvd+0x23/0x30 mm/hugetlb_cgroup.c:285
 alloc_huge_page+0x391/0xf70 mm/hugetlb.c:2405
 hugetlb_no_page+0x2bd/0xed0 mm/hugetlb.c:4368
 hugetlb_fault+0x568/0xce0 mm/hugetlb.c:4572
 handle_mm_fault+0x16e7/0x18a0 mm/memory.c:4381
 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1295
 handle_page_fault arch/x86/mm/fault.c:1365 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565

read to 0xffff88812bd0f6a0 of 8 bytes by task 24107 on cpu 0:
 page_counter_try_charge+0x21c/0x480 mm/page_counter.c:133
 __hugetlb_cgroup_charge_cgroup+0x1f7/0x430 mm/hugetlb_cgroup.c:258
 hugetlb_cgroup_charge_cgroup_rsvd+0x23/0x30 mm/hugetlb_cgroup.c:285
 alloc_huge_page+0x391/0xf70 mm/hugetlb.c:2405
 hugetlb_no_page+0x2bd/0xed0 mm/hugetlb.c:4368
 hugetlb_fault+0x568/0xce0 mm/hugetlb.c:4572
 handle_mm_fault+0x16e7/0x18a0 mm/memory.c:4381
 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1295
 handle_page_fault arch/x86/mm/fault.c:1365 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24107 Comm: syz-executor.2 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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