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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_address_in_vma

write to 0xffffea0004b7b158 of 8 bytes by task 10484 on cpu 1:
 page_cache_delete_batch mm/filemap.c:327 [inline]
 delete_from_page_cache_batch+0x37b/0x820 mm/filemap.c:358
 truncate_inode_pages_range+0x482/0x10e0 mm/truncate.c:366
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:845
 ext4_setattr+0xae3/0xf60 fs/ext4/inode.c:5500
 notify_change+0x86d/0xa60 fs/attr.c:336
 do_truncate+0xe0/0x120 fs/open.c:64
 handle_truncate fs/namei.c:2912 [inline]
 do_open fs/namei.c:3258 [inline]
 path_openat+0x1a30/0x20a0 fs/namei.c:3371
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_openat fs/open.c:1204 [inline]
 __se_sys_openat fs/open.c:1199 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1199
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea0004b7b158 of 8 bytes by task 10479 on cpu 0:
 PageAnon include/linux/page-flags.h:484 [inline]
 page_address_in_vma+0x4c/0x2d0 mm/rmap.c:704
 new_page+0x4b/0x1e0 mm/mempolicy.c:1221
 unmap_and_move+0x113/0x690 mm/migrate.c:1190
 migrate_pages+0x2e7/0xf10 mm/migrate.c:1460
 do_mbind+0xe47/0x1030 mm/mempolicy.c:1347
 kernel_mbind mm/mempolicy.c:1468 [inline]
 __do_sys_mbind mm/mempolicy.c:1475 [inline]
 __se_sys_mbind mm/mempolicy.c:1471 [inline]
 __x64_sys_mbind+0x142/0x170 mm/mempolicy.c:1471
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10479 Comm: syz-executor.2 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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