================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / move_expired_inodes read-write to 0xffff888101eb94d0 of 8 bytes by task 22 on cpu 1: move_expired_inodes+0x1bf/0x490 fs/fs-writeback.c:1257 queue_io+0xe1/0x2b0 fs/fs-writeback.c:1304 wb_writeback+0x255/0x660 fs/fs-writeback.c:1892 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:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff888101eb94d0 of 8 bytes by task 25467 on cpu 0: __mark_inode_dirty+0xb4/0x6b0 fs/fs-writeback.c:2274 mark_buffer_dirty+0x143/0x230 fs/buffer.c:1141 mark_buffer_dirty_inode+0x48/0x1b0 fs/buffer.c:575 __ext4_handle_dirty_metadata+0x1af/0x590 fs/ext4/ext4_jbd2.c:360 ext4_handle_dirty_dirblock+0x184/0x330 fs/ext4/namei.c:407 add_dirent_to_buf+0x4a8/0x610 fs/ext4/namei.c:2033 ext4_add_entry+0x62e/0x21a0 fs/ext4/namei.c:2242 ext4_add_nondir+0x50/0x190 fs/ext4/namei.c:2576 ext4_create+0x217/0x300 fs/ext4/namei.c:2621 vfs_create+0x238/0x300 fs/namei.c:2808 ovl_do_create fs/overlayfs/overlayfs.h:152 [inline] ovl_create_real+0x11b/0x250 fs/overlayfs/dir.c:188 ovl_create_temp+0x33/0x40 fs/overlayfs/dir.c:229 ovl_check_rename_whiteout fs/overlayfs/super.c:1239 [inline] ovl_make_workdir fs/overlayfs/super.c:1372 [inline] ovl_get_workdir fs/overlayfs/super.c:1474 [inline] ovl_fill_super+0x2c5e/0x3ab0 fs/overlayfs/super.c:2001 mount_nodev+0x4f/0xc0 fs/super.c:1412 ovl_mount+0x25/0x30 fs/overlayfs/super.c:2093 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x190 fs/super.c:1496 do_new_mount fs/namespace.c:2878 [inline] path_mount+0x119d/0x1c10 fs/namespace.c:3208 do_mount fs/namespace.c:3221 [inline] __do_sys_mount fs/namespace.c:3429 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3406 __x64_sys_mount+0x63/0x70 fs/namespace.c:3406 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: 25467 Comm: syz-executor.0 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================