KCSAN: data-race in fast_dput / shrink_dentry

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in fast_dput / shrink_dentry_list (2) fs				2	942d	950d	0/26	auto-closed as invalid on 2021/10/29 05:04

================================================================== BUG: KCSAN: data-race in fast_dput / shrink_dentry_list write to 0xffff888106e27cc0 of 4 bytes by task 14098 on cpu 1: shrink_dentry_list+0x127/0x340 fs/dcache.c:423 shrink_dcache_sb+0x188/0x2d0 fs/dcache.c:1296 reconfigure_super+0x2aa/0x4f0 fs/super.c:889 do_remount fs/namespace.c:2639 [inline] path_mount+0x1442/0x1ce0 fs/namespace.c:3227 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888106e27cc0 of 4 bytes by task 14099 on cpu 0: fast_dput+0x14/0x1c0 fs/dcache.c:749 dput+0x26/0x360 fs/dcache.c:875 path_put+0x1b/0x30 fs/namei.c:546 do_mount fs/namespace.c:3249 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x247/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00290440 -> 0x00210040 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14099 Comm: syz-executor.1 Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================