================================================================== BUG: KCSAN: data-race in ext4_mark_iloc_dirty / find_inode_bit write to 0xffff88812ea0f014 of 4 bytes by task 11502 on cpu 1: ext4_do_update_inode fs/ext4/inode.c:5084 [inline] ext4_mark_iloc_dirty+0x8bb/0x1650 fs/ext4/inode.c:5721 __ext4_mark_inode_dirty+0x4cd/0x5d0 fs/ext4/inode.c:5915 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:828 __ext4_new_inode+0x2a90/0x3060 fs/ext4/ialloc.c:1326 ext4_tmpfile+0x16b/0x2e0 fs/ext4/namei.c:2679 vfs_tmpfile+0xd5/0x1a0 fs/namei.c:3286 ovl_do_tmpfile fs/overlayfs/overlayfs.h:236 [inline] ovl_make_workdir fs/overlayfs/super.c:1363 [inline] ovl_get_workdir fs/overlayfs/super.c:1474 [inline] ovl_fill_super+0x2bc8/0x3ab0 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 read to 0xffff88812ea0f014 of 4 bytes by task 11503 on cpu 0: recently_deleted fs/ext4/ialloc.c:702 [inline] find_inode_bit+0x227/0x3a0 fs/ext4/ialloc.c:728 __ext4_new_inode+0xd22/0x3060 fs/ext4/ialloc.c:1062 ext4_mkdir+0x284/0x730 fs/ext4/namei.c:2793 vfs_mkdir+0x288/0x350 fs/namei.c:3652 do_mkdirat+0x132/0x220 fs/namei.c:3675 __do_sys_mkdir fs/namei.c:3691 [inline] __se_sys_mkdir fs/namei.c:3689 [inline] __x64_sys_mkdir+0x32/0x40 fs/namei.c:3689 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: 11503 Comm: syz-executor.5 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================