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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea00003fa258 of 8 bytes by task 20524 on cpu 1:
 page_cache_delete_batch mm/filemap.c:329 [inline]
 delete_from_page_cache_batch+0x37b/0x820 mm/filemap.c:360
 truncate_inode_pages_range+0x1d4/0xd60 mm/truncate.c:330
 truncate_inode_pages+0x20/0x30 mm/truncate.c:428
 kill_bdev fs/block_dev.c:86 [inline]
 set_blocksize+0x286/0x2a0 fs/block_dev.c:166
 sb_set_blocksize fs/block_dev.c:175 [inline]
 sb_min_blocksize+0x9d/0x120 fs/block_dev.c:191
 init_nilfs+0x43/0x8c0 fs/nilfs2/the_nilfs.c:571
 nilfs_fill_super fs/nilfs2/super.c:1046 [inline]
 nilfs_mount+0x4d6/0xaa0 fs/nilfs2/super.c:1316
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea00003fa258 of 8 bytes by task 20545 on cpu 0:
 page_mapping+0x13b/0x200 mm/util.c:706
 page_evictable mm/internal.h:84 [inline]
 __pagevec_lru_add_fn+0xb2/0x540 mm/swap.c:984
 __pagevec_lru_add+0x19a/0x280 mm/swap.c:1012
 lru_cache_add+0x109/0x160 mm/swap.c:462
 shmem_getpage_gfp+0x8c4/0x1980 mm/shmem.c:1934
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_file_read_iter+0x1b8/0x760 mm/shmem.c:2607
 call_read_iter include/linux/fs.h:1971 [inline]
 do_iter_readv_writev+0x2e8/0x360 fs/read_write.c:738
 do_iter_read+0x109/0x4b0 fs/read_write.c:801
 vfs_iter_read+0x4c/0x70 fs/read_write.c:843
 lo_read_simple drivers/block/loop.c:360 [inline]
 do_req_filebacked drivers/block/loop.c:636 [inline]
 loop_handle_cmd drivers/block/loop.c:2045 [inline]
 loop_queue_work+0xdfb/0x1330 drivers/block/loop.c:2063
 kthread_worker_fn+0x28f/0x540 kernel/kthread.c:735
 loop_kthread_worker_fn+0x3e/0x50 drivers/block/loop.c:932
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20545 Comm: loop3 Tainted: G        W         5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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