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BUG: KCSAN: data-race in xas_find_marked / xas_init_marks

write to 0xffff888060280b30 of 8 bytes by task 3983 on cpu 1:
 instrument_write include/linux/instrumented.h:42 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark lib/xarray.c:908 [inline]
 xas_init_marks+0x1b0/0x340 lib/xarray.c:941
 xas_store+0x213/0xd00 lib/xarray.c:803
 page_cache_delete mm/filemap.c:138 [inline]
 __delete_from_page_cache+0x21b/0x360 mm/filemap.c:239
 delete_from_page_cache+0x84/0x250 mm/filemap.c:274
 truncate_inode_page mm/truncate.c:228 [inline]
 truncate_inode_pages_range+0xbb9/0xf60 mm/truncate.c:449
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:839
 ext4_setattr+0xaea/0xe90 fs/ext4/inode.c:5403
 notify_change+0x7d7/0xa80 fs/attr.c:336
 do_truncate+0xe0/0x120 fs/open.c:64
 handle_truncate fs/namei.c:2909 [inline]
 do_open fs/namei.c:3255 [inline]
 path_openat+0x1a31/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3395
 do_sys_openat2+0x33b/0x500 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_creat fs/open.c:1258 [inline]
 __se_sys_creat fs/open.c:1252 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1252
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888060280b30 of 8 bytes by task 3896 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1625 [inline]
 xas_find_marked+0x22f/0x6b0 lib/xarray.c:1198
 find_get_pages_range_tag+0xa3/0x5a0 mm/filemap.c:2074
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1161
 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:519
 filemap_fdatawait_range+0x21/0xd0 mm/filemap.c:554
 filemap_fdatawait include/linux/fs.h:2608 [inline]
 __writeback_single_inode+0xe1/0x580 fs/fs-writeback.c:1471
 writeback_single_inode+0x11f/0x580 fs/fs-writeback.c:1570
 sync_inode fs/fs-writeback.c:2606 [inline]
 sync_inode_metadata+0x52/0x70 fs/fs-writeback.c:2626
 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline]
 ext4_sync_file+0x335/0x690 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2741 [inline]
 ext4_buffered_write_iter+0x36b/0x3b0 fs/ext4/file.c:276
 ext4_file_write_iter+0x49e/0x1060 include/linux/fs.h:779
 call_write_iter include/linux/fs.h:1877 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:721
 do_iter_write+0x112/0x4b0 fs/read_write.c:847
 vfs_iter_write+0x4c/0x70 fs/read_write.c:888
 iter_file_splice_write+0x41a/0x770 fs/splice.c:769
 do_splice_from fs/splice.c:865 [inline]
 direct_splice_actor+0x95/0x160 fs/splice.c:1035
 splice_direct_to_actor+0x365/0x660 fs/splice.c:990
 do_splice_direct+0xf2/0x170 fs/splice.c:1078
 do_sendfile+0x56a/0xba0 fs/read_write.c:1238
 __do_sys_sendfile64 fs/read_write.c:1293 [inline]
 __se_sys_sendfile64 fs/read_write.c:1285 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1285
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3896 Comm: syz-executor.4 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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