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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea00047c2018 of 8 bytes by task 16490 on cpu 0:
 page_cache_delete_batch mm/filemap.c:326 [inline]
 delete_from_page_cache_batch+0x672/0x780 mm/filemap.c:357
 truncate_inode_pages_range+0x52f/0x1010 mm/truncate.c:366
 truncate_inode_pages+0x2a/0x40 mm/truncate.c:476
 kill_bdev+0x7f/0xa0 fs/block_dev.c:87
 set_blocksize+0x18e/0x1c0 fs/block_dev.c:137
 sb_set_blocksize+0x3d/0xc0 fs/block_dev.c:146
 ext4_fill_super+0x16e6/0x79a0 fs/ext4/super.c:4118
 mount_bdev+0x264/0x2d0 fs/super.c:1417
 ext4_mount+0x38/0x50 fs/ext4/super.c:6112
 legacy_get_tree+0x78/0xf0 fs/fs_context.c:622
 vfs_get_tree+0x52/0x190 fs/super.c:1547
 do_new_mount fs/namespace.c:2816 [inline]
 do_mount+0xff0/0x1590 fs/namespace.c:3141
 __do_sys_mount fs/namespace.c:3350 [inline]
 __se_sys_mount fs/namespace.c:3327 [inline]
 __x64_sys_mount+0x12b/0x1a0 fs/namespace.c:3327
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea00047c2018 of 8 bytes by task 16510 on cpu 1:
 page_mapping+0x178/0x290 mm/util.c:675
 page_evictable mm/internal.h:84 [inline]
 __pagevec_lru_add_fn+0xdf/0x8c0 mm/swap.c:963
 pagevec_lru_move_fn+0xf5/0x170 mm/swap.c:211
 __pagevec_lru_add mm/swap.c:987 [inline]
 __lru_cache_add+0x119/0x1c0 mm/swap.c:411
 lru_cache_add mm/swap.c:447 [inline]
 lru_cache_add_active_or_unevictable+0xb0/0x1e0 mm/swap.c:477
 __do_huge_pmd_anonymous_page mm/huge_memory.c:645 [inline]
 do_huge_pmd_anonymous_page+0x64b/0x1000 mm/huge_memory.c:778
 create_huge_pmd mm/memory.c:4097 [inline]
 __handle_mm_fault+0x2d79/0x2ec0 mm/memory.c:4316
 handle_mm_fault+0x21c/0x540 mm/memory.c:4382
 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline]
 do_page_fault+0x48a/0xa96 arch/x86/mm/fault.c:1535
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16510 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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