================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff88810d70c398 of 8 bytes by task 26 on cpu 1: writeback_sb_inodes+0x494/0x1020 fs/fs-writeback.c:1710 wb_writeback+0x27d/0x660 fs/fs-writeback.c:1894 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039 wb_workfn+0xb8/0x410 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272 worker_thread+0x635/0xb90 kernel/workqueue.c:2418 kthread+0x1fa/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff88810d70c398 of 8 bytes by task 26432 on cpu 0: __mark_inode_dirty+0xb7/0x740 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/0x230 fs/buffer.c:2162 generic_write_end+0x5b/0x250 fs/buffer.c:2176 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3100 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3322 ext4_buffered_write_iter+0x2e5/0x3d0 fs/ext4/file.c:270 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1887 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x617/0x690 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 26432 Comm: syz-executor.1 Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================