KCSAN: data-race in generic_permission / pid_update

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in generic_permission / pid_update_inode fs				3	1633d	1636d	0/26	closed as invalid on 2019/11/19 13:54

================================================================== BUG: KCSAN: data-race in generic_permission / pid_update_inode read to 0xffff888125666ac8 of 2 bytes by task 11146 on cpu 0: acl_permission_check fs/namei.c:295 [inline] generic_permission+0x36/0x3d0 fs/namei.c:339 proc_pid_permission+0xea/0x1c0 fs/proc/base.c:735 do_inode_permission fs/namei.c:384 [inline] inode_permission+0x241/0x3c0 fs/namei.c:449 may_lookup fs/namei.c:1694 [inline] link_path_walk.part.0+0x622/0xa90 fs/namei.c:2074 link_path_walk fs/namei.c:2062 [inline] path_openat+0x14f/0x36e0 fs/namei.c:3524 do_filp_open+0x11e/0x1b0 fs/namei.c:3555 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x55/0x70 fs/open.c:1110 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888125666ac8 of 2 bytes by task 11150 on cpu 1: pid_update_inode+0x51/0x70 fs/proc/base.c:1820 pid_revalidate+0x91/0xd0 fs/proc/base.c:1841 d_revalidate fs/namei.c:758 [inline] d_revalidate fs/namei.c:755 [inline] lookup_fast+0x6f2/0x700 fs/namei.c:1607 walk_component+0x6d/0xe70 fs/namei.c:1796 link_path_walk.part.0+0x5d3/0xa90 fs/namei.c:2131 link_path_walk fs/namei.c:2062 [inline] path_openat+0x14f/0x36e0 fs/namei.c:3524 do_filp_open+0x11e/0x1b0 fs/namei.c:3555 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x55/0x70 fs/open.c:1110 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11150 Comm: ps Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================