syzbot

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BUG: KCSAN: data-race in __lookup_slow / fuse_change_entry_timeout

read-write to 0xffff88813786d180 of 4 bytes by task 16606 on cpu 0:
 fuse_dentry_settime fs/fuse/dir.c:68 [inline]
 fuse_change_entry_timeout+0x161/0x1e0 fs/fuse/dir.c:105
 fuse_lookup+0x196/0x290 fs/fuse/dir.c:488
 fuse_atomic_open+0xb9/0x840 fs/fuse/dir.c:610
 atomic_open fs/namei.c:2970 [inline]
 lookup_open fs/namei.c:3076 [inline]
 open_last_lookups fs/namei.c:3178 [inline]
 path_openat+0xa4b/0x20a0 fs/namei.c:3366
 do_filp_open+0xbd/0x1d0 fs/namei.c:3396
 do_sys_openat2+0xa3/0x240 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_openat fs/open.c:1200 [inline]
 __se_sys_openat fs/open.c:1195 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1195
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88813786d180 of 4 bytes by task 16615 on cpu 1:
 d_in_lookup include/linux/dcache.h:362 [inline]
 __lookup_slow+0xa6/0x250 fs/namei.c:1532
 lookup_slow fs/namei.c:1561 [inline]
 walk_component+0x2a5/0x350 fs/namei.c:1861
 lookup_last fs/namei.c:2310 [inline]
 path_lookupat+0x11d/0x550 fs/namei.c:2334
 do_o_path fs/namei.c:3340 [inline]
 path_openat+0x1ae7/0x20a0 fs/namei.c:3362
 do_filp_open+0xbd/0x1d0 fs/namei.c:3396
 do_sys_openat2+0xa3/0x240 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_openat fs/open.c:1200 [inline]
 __se_sys_openat fs/open.c:1195 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1195
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16615 Comm: syz-executor.5 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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