================================================================== BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark read to 0xffff8880b41f6724 of 4 bytes by task 21 on cpu 1: mapping_tagged include/linux/fs.h:521 [inline] __writeback_single_inode+0x367/0x8e0 fs/fs-writeback.c:1502 writeback_sb_inodes+0x4ba/0xa50 fs/fs-writeback.c:1716 __writeback_inodes_wb+0xe8/0x1b0 fs/fs-writeback.c:1785 wb_writeback+0x557/0x6a0 fs/fs-writeback.c:1894 wb_check_background_flush fs/fs-writeback.c:1962 [inline] wb_do_writeback fs/fs-writeback.c:2050 [inline] wb_workfn+0x696/0x970 fs/fs-writeback.c:2078 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 write to 0xffff8880b41f6724 of 4 bytes by task 3205 on cpu 0: xa_mark_set lib/xarray.c:68 [inline] xas_set_mark lib/xarray.c:885 [inline] xas_set_mark+0x14d/0x160 lib/xarray.c:869 __xa_set_mark+0xd3/0x100 lib/xarray.c:1699 __set_page_dirty+0x152/0x270 fs/buffer.c:584 mark_buffer_dirty+0x27f/0x2c0 fs/buffer.c:1112 __block_commit_write.isra.0+0x11f/0x170 fs/buffer.c:2041 block_write_end+0x6d/0x140 fs/buffer.c:2119 generic_write_end+0x8a/0x1f0 fs/buffer.c:2133 ext4_da_write_end+0x158/0x620 fs/ext4/inode.c:3189 generic_perform_write+0x1d3/0x320 mm/filemap.c:3316 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3434 ext4_file_write_iter+0x1bd/0xa00 fs/ext4/file.c:268 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3205 Comm: syz-executor.2 Not tainted 5.4.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================