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BUG: KCSAN: data-race in delete_from_page_cache_batch / folio_mapping

write to 0xffffea0004c50218 of 8 bytes by task 3269 on cpu 1:
 page_cache_delete_batch mm/filemap.c:322 [inline]
 delete_from_page_cache_batch+0x35c/0x780 mm/filemap.c:353
 truncate_inode_pages_range+0x1d5/0xa00 mm/truncate.c:336
 truncate_inode_pages+0x20/0x30 mm/truncate.c:435
 kill_bdev block/bdev.c:78 [inline]
 set_blocksize+0x24e/0x270 block/bdev.c:158
 sb_set_blocksize+0x2c/0xa0 block/bdev.c:167
 ext4_fill_super+0x18c6/0x5870 fs/ext4/super.c:4333
 mount_bdev+0x1e8/0x290 fs/super.c:1370
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1500
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11cf/0x1c40 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea0004c50218 of 8 bytes by task 2897 on cpu 0:
 folio_mapping+0x92/0x120 mm/util.c:722
 folio_evictable mm/internal.h:112 [inline]
 __pagevec_lru_add_fn+0x81/0x380 mm/swap.c:1043
 __pagevec_lru_add+0x1c3/0x270 mm/swap.c:1071
 folio_add_lru+0x11a/0x160 mm/swap.c:469
 lru_cache_add+0x37/0x50 mm/folio-compat.c:108
 shmem_getpage_gfp+0xc08/0x12c0 mm/shmem.c:1941
 shmem_getpage mm/shmem.c:150 [inline]
 shmem_file_read_iter+0x1b2/0x5d0 mm/shmem.c:2547
 call_read_iter include/linux/fs.h:2156 [inline]
 do_iter_readv_writev+0x2fb/0x380 fs/read_write.c:723
 do_iter_read+0x192/0x5d0 fs/read_write.c:786
 vfs_iter_read+0x4c/0x70 fs/read_write.c:828
 lo_read_simple drivers/block/loop.c:284 [inline]
 do_req_filebacked drivers/block/loop.c:499 [inline]
 loop_handle_cmd drivers/block/loop.c:1857 [inline]
 loop_process_work+0x70b/0x1280 drivers/block/loop.c:1897
 loop_rootcg_workfn+0x1b/0x20 drivers/block/loop.c:1928
 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298
 worker_thread+0x616/0xa70 kernel/workqueue.c:2445
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

value changed: 0xffff888100475bf8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2897 Comm: kworker/u4:21 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: loop5 loop_rootcg_workfn
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