================================================================== BUG: KCSAN: data-race in atime_needs_update / propagate_one write to 0xffff88812a5f5d30 of 4 bytes by task 31697 on cpu 0: propagate_one+0x32d/0x400 fs/pnode.c:267 propagate_mnt+0x2f8/0x640 fs/pnode.c:319 attach_recursive_mnt+0x519/0x1210 fs/namespace.c:2129 graft_tree fs/namespace.c:2237 [inline] do_add_mount fs/namespace.c:2783 [inline] do_new_mount_fc fs/namespace.c:2822 [inline] do_new_mount fs/namespace.c:2876 [inline] do_mount+0x1aa8/0x1bd0 fs/namespace.c:3199 __do_sys_mount fs/namespace.c:3409 [inline] __se_sys_mount+0xd3/0x100 fs/namespace.c:3386 __x64_sys_mount+0x63/0x70 fs/namespace.c:3386 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812a5f5d30 of 4 bytes by task 31696 on cpu 1: atime_needs_update+0x133/0x370 fs/inode.c:1806 touch_atime+0x53/0x1a0 fs/inode.c:1828 file_accessed include/linux/fs.h:2229 [inline] ext4_file_mmap+0xe2/0x200 fs/ext4/file.c:755 call_mmap include/linux/fs.h:1912 [inline] mmap_region+0xbd1/0x1330 mm/mmap.c:1772 do_mmap+0x7ad/0xce0 mm/mmap.c:1545 do_mmap_pgoff include/linux/mm.h:2596 [inline] vm_mmap_pgoff+0xed/0x170 mm/util.c:506 vm_mmap+0x8c/0xb0 mm/util.c:525 elf_map+0xc6/0x220 fs/binfmt_elf.c:381 load_elf_interp fs/binfmt_elf.c:610 [inline] load_elf_binary+0x1a3b/0x2d80 fs/binfmt_elf.c:1184 search_binary_handler fs/exec.c:1749 [inline] exec_binprm+0x1d9/0x760 fs/exec.c:1790 __do_execve_file+0xf07/0x1250 fs/exec.c:1926 do_execveat_common fs/exec.c:1980 [inline] do_execve+0x2f/0x40 fs/exec.c:1997 call_usermodehelper_exec_async+0x206/0x2e0 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 31696 Comm: modprobe Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================