syzbot

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BUG: KCSAN: data-race in mprotect_fixup / page_vma_mapped_walk

write to 0xffff88811eb46d40 of 8 bytes by task 10285 on cpu 1:
 vm_flags_init include/linux/mm.h:874 [inline]
 vm_flags_reset include/linux/mm.h:886 [inline]
 mprotect_fixup+0x419/0x5e0 mm/mprotect.c:679
 do_mprotect_pkey+0x653/0x960 mm/mprotect.c:840
 __do_sys_mprotect mm/mprotect.c:861 [inline]
 __se_sys_mprotect mm/mprotect.c:858 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:858
 x64_sys_call+0x2770/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811eb46d40 of 8 bytes by task 10277 on cpu 0:
 is_vm_hugetlb_page include/linux/hugetlb_inline.h:11 [inline]
 page_vma_mapped_walk+0xb6/0xb90 mm/page_vma_mapped.c:195
 remove_migration_pte+0xf7/0x9c0 mm/migrate.c:253
 rmap_walk_anon+0x28f/0x440 mm/rmap.c:2646
 rmap_walk+0x5b/0x70 mm/rmap.c:2724
 remove_migration_ptes mm/migrate.c:373 [inline]
 migrate_folio_move mm/migrate.c:1389 [inline]
 migrate_pages_batch+0x1374/0x1910 mm/migrate.c:1899
 migrate_pages_sync mm/migrate.c:1965 [inline]
 migrate_pages+0xff1/0x1820 mm/migrate.c:2074
 do_mbind mm/mempolicy.c:1390 [inline]
 kernel_mbind mm/mempolicy.c:1533 [inline]
 __do_sys_mbind mm/mempolicy.c:1607 [inline]
 __se_sys_mbind+0xf79/0x1160 mm/mempolicy.c:1603
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1603
 x64_sys_call+0x2662/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:238
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000100077 -> 0x0000000000100070

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 10277 Comm: syz.4.2447 Not tainted 6.12.0-syzkaller-09435-g2c22dc1ee3a1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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