KCSAN: data-race in generic_fillattr / task_dump

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in generic_fillattr / task_dump_owner (2) fs				16	1537d	1627d	0/26	auto-closed as invalid on 2020/04/12 14:40

================================================================== BUG: KCSAN: data-race in generic_fillattr / task_dump_owner read to 0xffff888124467570 of 4 bytes by task 7320 on cpu 1: generic_fillattr+0xc7/0x1e0 fs/stat.c:40 pid_getattr+0x74/0x1a0 fs/proc/base.c:1790 vfs_getattr_nosec+0x12e/0x170 fs/stat.c:81 vfs_getattr+0x54/0x70 fs/stat.c:118 vfs_statx+0x102/0x190 fs/stat.c:191 vfs_stat include/linux/fs.h:3188 [inline] __do_sys_newstat+0x51/0xb0 fs/stat.c:341 __se_sys_newstat fs/stat.c:337 [inline] __x64_sys_newstat+0x3a/0x50 fs/stat.c:337 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888124467570 of 4 bytes by task 7324 on cpu 0: task_dump_owner+0x246/0x260 fs/proc/base.c:1700 pid_update_inode+0x3c/0x70 fs/proc/base.c:1818 pid_revalidate+0x91/0xd0 fs/proc/base.c:1841 d_revalidate fs/namei.c:765 [inline] d_revalidate fs/namei.c:762 [inline] lookup_fast+0x7cb/0x7e0 fs/namei.c:1613 walk_component+0x6d/0xe80 fs/namei.c:1804 link_path_walk.part.0+0x5d3/0xa90 fs/namei.c:2139 link_path_walk fs/namei.c:2070 [inline] path_openat+0x14f/0x3530 fs/namei.c:3532 do_filp_open+0x11e/0x1b0 fs/namei.c:3563 do_sys_open+0x3b3/0x4f0 fs/open.c:1089 __do_sys_open fs/open.c:1107 [inline] __se_sys_open fs/open.c:1102 [inline] __x64_sys_open+0x55/0x70 fs/open.c:1102 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7324 Comm: ps Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================