================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode write to 0xffff88811f1ba5c8 of 8 bytes by task 12481 on cpu 0: __writeback_single_inode+0x256/0x580 fs/fs-writeback.c:1492 writeback_sb_inodes+0x6c0/0xfd0 fs/fs-writeback.c:1721 wb_writeback+0x28d/0x670 fs/fs-writeback.c:1894 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039 wb_workfn+0xc8/0x430 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x950 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff88811f1ba5c8 of 8 bytes by task 16072 on cpu 1: __mark_inode_dirty+0xb9/0x740 fs/fs-writeback.c:2274 mark_buffer_dirty+0x143/0x230 fs/buffer.c:1141 __block_commit_write fs/buffer.c:2084 [inline] block_write_end+0x13d/0x220 fs/buffer.c:2162 generic_write_end+0x5c/0x250 fs/buffer.c:2176 ext4_da_write_end+0x58d/0x750 fs/ext4/inode.c:3091 generic_perform_write+0x23b/0x390 mm/filemap.c:3516 ext4_buffered_write_iter+0x2ce/0x3b0 fs/ext4/file.c:269 ext4_file_write_iter+0x49e/0x1060 include/linux/fs.h:779 call_write_iter include/linux/fs.h:1877 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x654/0x6d0 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16072 Comm: syz-executor.4 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================