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BUG: KCSAN: data-race in __delete_from_page_cache / page_mapping

write to 0xffffea0002da46d8 of 8 bytes by task 2774 on cpu 0:
 page_cache_delete mm/filemap.c:140 [inline]
 __delete_from_page_cache+0x196/0x490 mm/filemap.c:238
 delete_from_page_cache+0xb1/0x110 mm/filemap.c:273
 truncate_inode_page+0x42/0x60 mm/truncate.c:228
 truncate_inode_pages_range+0x898/0x1130 mm/truncate.c:449
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache+0x5b/0x80 mm/truncate.c:817
 ext4_setattr+0xc32/0x1320 fs/ext4/inode.c:5382
 notify_change+0x82b/0xad0 fs/attr.c:336
 do_truncate+0xf9/0x180 fs/open.c:64
 handle_truncate fs/namei.c:2887 [inline]
 do_open fs/namei.c:3233 [inline]
 path_openat+0x1e51/0x23d0 fs/namei.c:3346
 do_filp_open+0x11e/0x1b0 fs/namei.c:3373
 do_sys_openat2+0x52e/0x680 fs/open.c:1148
 do_sys_open+0xa2/0x110 fs/open.c:1164
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_creat fs/open.c:1232 [inline]
 __se_sys_creat fs/open.c:1230 [inline]
 __x64_sys_creat+0x42/0x60 fs/open.c:1230
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea0002da46d8 of 8 bytes by task 2759 on cpu 1:
 page_mapping+0x178/0x290 mm/util.c:675
 wait_on_page_writeback mm/page-writeback.c:2828 [inline]
 wait_on_page_writeback+0xbc/0x1c0 mm/page-writeback.c:2825
 __filemap_fdatawait_range+0x10b/0x200 mm/filemap.c:526
 filemap_fdatawait_range+0x2b/0x50 mm/filemap.c:553
 filemap_fdatawait include/linux/fs.h:2751 [inline]
 __writeback_single_inode+0x5bc/0x910 fs/fs-writeback.c:1462
 writeback_single_inode+0x219/0x2f0 fs/fs-writeback.c:1565
 sync_inode fs/fs-writeback.c:2602 [inline]
 sync_inode_metadata+0x75/0xa0 fs/fs-writeback.c:2622
 ext4_fsync_nojournal fs/ext4/fsync.c:94 [inline]
 ext4_sync_file+0x47a/0x8b0 fs/ext4/fsync.c:172
 vfs_fsync_range+0x7c/0x150 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2872 [inline]
 ext4_buffered_write_iter+0x211/0x280 fs/ext4/file.c:277
 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1907 [inline]
 do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694
 do_iter_write fs/read_write.c:999 [inline]
 do_iter_write+0x137/0x3a0 fs/read_write.c:980
 vfs_iter_write+0x56/0x80 fs/read_write.c:1040
 iter_file_splice_write+0x530/0x830 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x97/0xb0 fs/splice.c:1037
 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x380/0x800 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1582 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2759 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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