================================================================== BUG: KCSAN: data-race in __xa_set_mark / find_get_pages_range_tag write to 0xffff888009ebc8e8 of 8 bytes by task 9909 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_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline] node_set_mark lib/xarray.c:93 [inline] xas_set_mark lib/xarray.c:882 [inline] __xa_set_mark+0x239/0x2f0 lib/xarray.c:1898 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:609 mark_buffer_dirty+0x126/0x230 fs/buffer.c:1137 __block_commit_write fs/buffer.c:2084 [inline] block_write_end+0x13d/0x230 fs/buffer.c:2162 generic_write_end+0x5b/0x250 fs/buffer.c:2176 ext4_da_write_end+0x58d/0x750 fs/ext4/inode.c:3091 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3536 ext4_buffered_write_iter+0x2ce/0x3b0 fs/ext4/file.c:269 ext4_file_write_iter+0x480/0x10b0 fs/ext4/file.c:501 call_write_iter include/linux/fs.h:1887 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x630/0x6b0 fs/read_write.c:586 ksys_write+0xce/0x180 fs/read_write.c:639 __do_sys_write fs/read_write.c:651 [inline] __se_sys_write fs/read_write.c:648 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:648 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888009ebc8e8 of 8 bytes by task 9894 on cpu 0: xas_find_chunk include/linux/xarray.h:1647 [inline] xas_next_marked include/linux/xarray.h:1678 [inline] find_get_pages_range_tag+0x30c/0x5a0 mm/filemap.c:2094 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1161 mpage_prepare_extent_to_map+0x18a/0x630 fs/ext4/inode.c:2558 ext4_writepages+0x968/0x1e20 fs/ext4/inode.c:2779 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422 __filemap_fdatawrite mm/filemap.c:430 [inline] filemap_flush+0x1f/0x30 mm/filemap.c:457 ext4_alloc_da_blocks+0x4a/0x100 fs/ext4/inode.c:3145 ext4_release_file+0x5b/0x1c0 fs/ext4/file.c:142 __fput+0x243/0x4d0 fs/file_table.c:281 ____fput+0x11/0x20 fs/file_table.c:314 task_work_run+0x8e/0x110 kernel/task_work.c:141 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:165 [inline] exit_to_user_mode_prepare+0x1a4/0x200 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:267 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9894 Comm: syz-executor.2 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================