================================================================== BUG: KCSAN: data-race in find_get_pages_range_tag / xas_clear_mark write to 0xffff88810d7defa8 of 8 bytes by task 10609 on cpu 0: 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+0xa1/0x180 lib/xarray.c:911 __test_set_page_writeback+0x3c3/0x4d0 mm/page-writeback.c:2800 ext4_bio_write_page+0xfe/0xe70 fs/ext4/page-io.c:450 mpage_submit_page fs/ext4/inode.c:2101 [inline] mpage_map_and_submit_buffers fs/ext4/inode.c:2349 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2488 [inline] ext4_writepages+0xea2/0x1e50 fs/ext4/inode.c:2801 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:3165 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:142 __fput+0x24b/0x4e0 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0x8e/0x110 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x16b/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810d7defa8 of 8 bytes by task 10614 on cpu 1: xas_find_chunk include/linux/xarray.h:1660 [inline] xas_next_marked include/linux/xarray.h:1691 [inline] find_get_pages_range_tag+0x35c/0x600 mm/filemap.c:2103 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122 mpage_prepare_extent_to_map+0x18a/0x630 fs/ext4/inode.c:2578 ext4_writepages+0x97b/0x1e50 fs/ext4/inode.c:2799 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:3165 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:142 __fput+0x24b/0x4e0 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0x8e/0x110 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x16b/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 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: 1 PID: 10614 Comm: syz-executor.4 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================