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BUG: KCSAN: data-race in __lru_add_drain_all / mark_page_accessed

write to 0xffff888237c42728 of 1 bytes by task 5691 on cpu 0:
 pagevec_add include/linux/pagevec.h:74 [inline]
 pagevec_add_and_need_flush mm/swap.c:244 [inline]
 activate_page mm/swap.c:359 [inline]
 mark_page_accessed+0x36e/0x550 mm/swap.c:444
 zap_pte_range+0x5f3/0xe00 mm/memory.c:1359
 zap_pmd_range mm/memory.c:1481 [inline]
 zap_pud_range mm/memory.c:1510 [inline]
 zap_p4d_range mm/memory.c:1531 [inline]
 unmap_page_range+0x2dc/0x3d0 mm/memory.c:1552
 unmap_single_vma+0x157/0x210 mm/memory.c:1597
 zap_page_range_single+0x1a4/0x230 mm/memory.c:1680
 unmap_mapping_range_vma mm/memory.c:3320 [inline]
 unmap_mapping_range_tree mm/memory.c:3341 [inline]
 unmap_mapping_pages+0x162/0x1b0 mm/memory.c:3403
 unmap_mapping_range+0x46/0x50 mm/memory.c:3438
 truncate_pagecache_range+0x6b/0x90 mm/truncate.c:848
 ext4_punch_hole+0x33b/0x9a0 fs/ext4/inode.c:4075
 ext4_fallocate+0xea/0x4d0 fs/ext4/extents.c:4662
 vfs_fallocate+0x463/0x660 fs/open.c:311
 madvise_remove+0x126/0x1e0 mm/madvise.c:923
 madvise_vma mm/madvise.c:985 [inline]
 do_madvise+0x53c/0x10a0 mm/madvise.c:1199
 __do_sys_madvise mm/madvise.c:1225 [inline]
 __se_sys_madvise mm/madvise.c:1223 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1223
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237c42728 of 1 bytes by task 5681 on cpu 1:
 pagevec_count include/linux/pagevec.h:61 [inline]
 need_activate_page_drain mm/swap.c:347 [inline]
 __lru_add_drain_all+0x236/0x3e0 mm/swap.c:833
 lru_add_drain_all+0xc/0x10 mm/swap.c:850
 invalidate_bdev+0x50/0x70 fs/block_dev.c:96
 __loop_clr_fd+0x52b/0x8b0 drivers/block/loop.c:1336
 loop_clr_fd drivers/block/loop.c:1430 [inline]
 lo_ioctl+0x9f7/0x1210 drivers/block/loop.c:1786
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585
 block_ioctl+0x6d/0x80 fs/block_dev.c:1602
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x03 -> 0x08

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5681 Comm: syz-executor.4 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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