================================================================== BUG: KCSAN: data-race in __xa_set_mark / find_get_pages_range_tag write to 0xffff888132c9b8e8 of 8 bytes by task 10097 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_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+0xef/0x1b0 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+0x5c/0x240 fs/buffer.c:2176 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3111 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3423 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:270 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f0/0x7e0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888132c9b8e8 of 8 bytes by task 10102 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:2107 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122 mpage_prepare_extent_to_map+0x195/0x640 fs/ext4/inode.c:2578 ext4_writepages+0x97b/0x1e70 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+0x24e/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+0x17c/0x1b0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:294 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: 10102 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================