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BUG: KCSAN: data-race in __delete_from_page_cache / page_mapping

write to 0xffffea00048fa8d8 of 8 bytes by task 10900 on cpu 0:
 page_cache_delete mm/filemap.c:140 [inline]
 __delete_from_page_cache+0x185/0x490 mm/filemap.c:238
 invalidate_complete_page2 mm/truncate.c:651 [inline]
 invalidate_inode_pages2_range+0x757/0xbb0 mm/truncate.c:744
 iomap_dio_rw+0x540/0x9a0 fs/iomap/direct-io.c:481
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter fs/ext4/file.c:129 [inline]
 ext4_file_read_iter+0x2cf/0x370 fs/ext4/file.c:114
 call_read_iter include/linux/fs.h:1895 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:313
 do_splice_to+0xf2/0x130 fs/splice.c:892
 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1520
 __do_sys_sendfile64 fs/read_write.c:1581 [inline]
 __se_sys_sendfile64 fs/read_write.c:1567 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1567
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea00048fa8d8 of 8 bytes by task 10896 on cpu 1:
 page_mapping+0x185/0x2a0 mm/util.c:675
 wait_on_page_writeback mm/page-writeback.c:2821 [inline]
 wait_on_page_writeback+0xc3/0x1c0 mm/page-writeback.c:2818
 __filemap_fdatawait_range+0x113/0x1d0 mm/filemap.c:526
 filemap_fdatawait_range mm/filemap.c:553 [inline]
 filemap_write_and_wait_range mm/filemap.c:663 [inline]
 filemap_write_and_wait_range+0xd9/0x150 mm/filemap.c:648
 iomap_dio_rw+0x3a2/0x9a0 fs/iomap/direct-io.c:471
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter fs/ext4/file.c:129 [inline]
 ext4_file_read_iter+0x2cf/0x370 fs/ext4/file.c:114
 call_read_iter include/linux/fs.h:1895 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:313
 do_splice_to+0xf2/0x130 fs/splice.c:892
 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1520
 __do_sys_sendfile64 fs/read_write.c:1581 [inline]
 __se_sys_sendfile64 fs/read_write.c:1567 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1567
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10896 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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