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BUG: KCSAN: data-race in mlock_new_page / need_mlock_page_drain

write to 0xffff888237d27ef0 of 1 bytes by task 6134 on cpu 1:
 pagevec_add include/linux/pagevec.h:75 [inline]
 mlock_new_page+0x23b/0x500 mm/mlock.c:280
 lru_cache_add_inactive_or_unevictable+0x55/0x60 mm/swap.c:486
 do_anonymous_page+0x71d/0xad0 mm/memory.c:3866
 handle_pte_fault mm/memory.c:4625 [inline]
 __handle_mm_fault mm/memory.c:4763 [inline]
 handle_mm_fault+0x69f/0xca0 mm/memory.c:4861
 faultin_page mm/gup.c:878 [inline]
 __get_user_pages+0x322/0xb70 mm/gup.c:1099
 populate_vma_page_range mm/gup.c:1442 [inline]
 __mm_populate+0x27a/0x390 mm/gup.c:1555
 mm_populate include/linux/mm.h:2701 [inline]
 __do_sys_mlockall+0x24b/0x2d0 mm/mlock.c:720
 __se_sys_mlockall mm/mlock.c:696 [inline]
 __x64_sys_mlockall+0x1a/0x20 mm/mlock.c:696
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d27ef0 of 1 bytes by task 1826 on cpu 0:
 pagevec_count include/linux/pagevec.h:62 [inline]
 need_mlock_page_drain+0x2c/0x50 mm/mlock.c:236
 __lru_add_drain_all+0x24c/0x3e0 mm/swap.c:832
 lru_add_drain_all+0xc/0x10 mm/swap.c:849
 invalidate_bdev+0x56/0x80 block/bdev.c:87
 ext4_put_super+0x408/0x610 fs/ext4/super.c:1271
 generic_shutdown_super+0xdf/0x250 fs/super.c:462
 kill_block_super+0x4a/0x90 fs/super.c:1394
 deactivate_locked_super+0x6a/0xb0 fs/super.c:332
 deactivate_super+0x85/0x90 fs/super.c:363
 cleanup_mnt+0x267/0x2d0 fs/namespace.c:1186
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1193
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x122/0x140 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:294
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x06 -> 0x09

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1826 Comm: syz-executor.5 Not tainted 5.17.0-syzkaller-14114-g09bb8856d4a7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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