================================================================== BUG: KCSAN: data-race in __ext4_new_inode / _find_next_bit.constprop.0 write to 0xffff888123fe13c0 of 8 bytes by task 12855 on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:71 [inline] __test_and_set_bit_le include/asm-generic/bitops/le.h:90 [inline] __ext4_new_inode+0xf4d/0x3020 fs/ext4/ialloc.c:957 ext4_whiteout_for_rename fs/ext4/namei.c:3635 [inline] ext4_rename+0xfac/0x1810 fs/ext4/namei.c:3748 ext4_rename2+0x117/0x190 fs/ext4/namei.c:4031 vfs_rename+0x8f8/0x1130 fs/namei.c:4287 ovl_do_rename fs/overlayfs/overlayfs.h:196 [inline] ovl_check_rename_whiteout fs/overlayfs/super.c:1097 [inline] ovl_make_workdir fs/overlayfs/super.c:1174 [inline] ovl_get_workdir.isra.0+0x444/0x7c0 fs/overlayfs/super.c:1264 ovl_fill_super+0xaef/0x2491 fs/overlayfs/super.c:1759 mount_nodev+0x66/0xf0 fs/super.c:1463 ovl_mount+0x30/0x50 fs/overlayfs/super.c:1846 legacy_get_tree+0x78/0xf0 fs/fs_context.c:622 vfs_get_tree+0x52/0x190 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0xff0/0x1590 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x12b/0x1a0 fs/namespace.c:3327 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888123fe13c0 of 8 bytes by task 12856 on cpu 0: _find_next_bit.constprop.0+0x61/0x160 lib/find_bit.c:39 find_next_zero_bit+0x35/0x50 lib/find_bit.c:87 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline] find_inode_bit.isra.0+0xa1/0x330 fs/ext4/ialloc.c:718 __ext4_new_inode+0xd7b/0x3020 fs/ext4/ialloc.c:927 ext4_symlink+0x322/0x9e0 fs/ext4/namei.c:3295 vfs_symlink fs/namei.c:3937 [inline] vfs_symlink+0x216/0x330 fs/namei.c:3923 do_symlinkat+0x1ac/0x1e0 fs/namei.c:3964 __do_sys_symlink fs/namei.c:3983 [inline] __se_sys_symlink fs/namei.c:3981 [inline] __x64_sys_symlink+0x3c/0x50 fs/namei.c:3981 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12856 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================