================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff8880bba1b2c0 of 8 bytes by task 10328 on cpu 1: writeback_sb_inodes+0x4b7/0xff0 fs/fs-writeback.c:1710 __writeback_inodes_wb+0xb0/0x2b0 fs/fs-writeback.c:1790 wb_writeback+0x2b0/0x6f0 fs/fs-writeback.c:1896 wb_check_start_all fs/fs-writeback.c:2020 [inline] wb_do_writeback+0x423/0x5f0 fs/fs-writeback.c:2046 wb_workfn+0xc8/0x470 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x9a0 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 0xffff8880bba1b2c0 of 8 bytes by task 16490 on cpu 0: __mark_inode_dirty+0xb9/0x7f0 fs/fs-writeback.c:2274 mark_buffer_dirty+0x14b/0x260 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+0x57e/0x760 fs/ext4/inode.c:3091 generic_perform_write+0x23b/0x390 mm/filemap.c:3414 ext4_buffered_write_iter+0x2cc/0x3b0 fs/ext4/file.c:269 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x665/0x6f0 fs/read_write.c:578 ksys_write+0xce/0x180 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:640 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: 16490 Comm: syz-executor.2 Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================