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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

read to 0xffffea00047ae558 of 8 bytes by task 10687 on cpu 0:
 page_mapping+0x185/0x2a0 mm/util.c:665
 page_evictable+0x3a/0x110 mm/vmscan.c:4321
 __pagevec_lru_add_fn+0xe1/0x810 mm/swap.c:942
 pagevec_lru_move_fn+0xfe/0x180 mm/swap.c:211
 __pagevec_lru_add mm/swap.c:966 [inline]
 lru_add_drain_cpu+0x178/0x2e0 mm/swap.c:594
 lru_add_drain+0x35/0x80 mm/swap.c:689
 __pagevec_release+0x74/0x90 mm/swap.c:859
 pagevec_release include/linux/pagevec.h:88 [inline]
 truncate_inode_pages_range+0x774/0x1120 mm/truncate.c:370
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache+0x60/0x80 mm/truncate.c:817
 ext4_setattr+0xb81/0x15a0 fs/ext4/inode.c:5659
 notify_change+0x7e1/0xaa0 fs/attr.c:337
 do_truncate+0xfb/0x180 fs/open.c:64
 handle_truncate fs/namei.c:2998 [inline]
 do_last fs/namei.c:3414 [inline]
 path_openat+0x2f48/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 ksys_open include/linux/syscalls.h:1385 [inline]
 __do_sys_creat fs/open.c:1155 [inline]
 __se_sys_creat fs/open.c:1153 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1153
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffffea00047ae558 of 8 bytes by task 10682 on cpu 1:
 page_cache_delete_batch mm/filemap.c:326 [inline]
 delete_from_page_cache_batch+0x674/0x790 mm/filemap.c:357
 truncate_inode_pages_range+0x593/0x1120 mm/truncate.c:366
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache+0x60/0x80 mm/truncate.c:817
 ext4_setattr+0xb81/0x15a0 fs/ext4/inode.c:5659
 notify_change+0x7e1/0xaa0 fs/attr.c:337
 do_truncate+0xfb/0x180 fs/open.c:64
 handle_truncate fs/namei.c:2998 [inline]
 do_last fs/namei.c:3414 [inline]
 path_openat+0x2f48/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_openat fs/open.c:1124 [inline]
 __se_sys_openat fs/open.c:1118 [inline]
 __x64_sys_openat+0x62/0x80 fs/open.c:1118
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10682 Comm: syz-executor.3 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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