================================================================== BUG: KCSAN: data-race in dentry_lru_isolate_shrink / dput write to 0xffff8880bb4b8600 of 4 bytes by task 18493 on cpu 0: d_lru_shrink_move fs/dcache.c:453 [inline] dentry_lru_isolate_shrink+0x7b/0x100 fs/dcache.c:1240 __list_lru_walk_one+0xfb/0x320 mm/list_lru.c:222 list_lru_walk_one mm/list_lru.c:266 [inline] list_lru_walk_node+0x63/0x1a0 mm/list_lru.c:295 list_lru_walk include/linux/list_lru.h:215 [inline] shrink_dcache_sb+0x97/0x1c0 fs/dcache.c:1259 reconfigure_super+0x267/0x4d0 fs/super.c:940 do_remount fs/namespace.c:2611 [inline] do_mount+0x1354/0x1bd0 fs/namespace.c:3190 __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+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880bb4b8600 of 4 bytes by task 8840 on cpu 1: fast_dput fs/dcache.c:746 [inline] dput+0x2f/0x420 fs/dcache.c:865 path_put fs/namei.c:496 [inline] nd_jump_root+0x9e/0x260 fs/namei.c:886 pick_link fs/namei.c:1667 [inline] step_into+0x8a7/0xe70 fs/namei.c:1716 walk_component+0x190/0x350 fs/namei.c:1866 lookup_last fs/namei.c:2309 [inline] path_lookupat+0x12d/0x560 fs/namei.c:2333 filename_lookup+0xf2/0x380 fs/namei.c:2366 user_path_at_empty+0x3b/0x50 fs/namei.c:2646 user_path_at include/linux/namei.h:59 [inline] ksys_umount+0xc2/0xa80 fs/namespace.c:1733 __do_sys_umount fs/namespace.c:1759 [inline] __se_sys_umount fs/namespace.c:1757 [inline] __x64_sys_umount+0x2c/0x40 fs/namespace.c:1757 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8840 Comm: syz-executor.2 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================