================================================================== BUG: KCSAN: data-race in __xa_clear_mark / find_get_pages_range_tag write to 0xffff88806f3be8f0 of 8 bytes by task 45 on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline] node_clear_mark lib/xarray.c:100 [inline] xas_clear_mark lib/xarray.c:908 [inline] __xa_clear_mark+0x229/0x350 lib/xarray.c:1726 test_clear_page_writeback+0x245/0x440 mm/page-writeback.c:2741 end_page_writeback+0x8e/0xf0 mm/filemap.c:1314 ext4_finish_bio+0x419/0x480 fs/ext4/page-io.c:146 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:161 ext4_end_io_end fs/ext4/page-io.c:195 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline] ext4_end_io_rsv_work+0x2f6/0x350 fs/ext4/page-io.c:274 process_one_work+0x3cb/0x990 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x210/0x220 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 read to 0xffff88806f3be8f0 of 8 bytes by task 16284 on cpu 0: xas_find_chunk include/linux/xarray.h:1625 [inline] xas_next_marked include/linux/xarray.h:1656 [inline] find_get_pages_range_tag+0x2fc/0x570 mm/filemap.c:1908 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1121 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:518 file_write_and_wait_range+0xea/0x120 mm/filemap.c:764 ext4_sync_file+0xe2/0x680 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2884 [inline] ext4_buffered_write_iter+0x34e/0x390 fs/ext4/file.c:277 ext4_file_write_iter+0x4a3/0xfd0 fs/ext4/file.c:498 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x321/0x3c0 fs/read_write.c:694 do_iter_write+0x10e/0x470 fs/read_write.c:999 vfs_iter_write+0x4c/0x70 fs/read_write.c:1040 ovl_write_iter+0x48f/0x600 fs/overlayfs/file.c:350 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0x2d8/0x340 fs/read_write.c:497 vfs_write+0x19b/0x350 fs/read_write.c:559 ksys_write+0xce/0x180 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write fs/read_write.c:621 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:621 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 16284 Comm: syz-executor.3 Not tainted 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================