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BUG: KCSAN: data-race in fuse_abort_conn / fuse_get_req

write to 0xffff888108793b28 of 4 bytes by task 4638 on cpu 1:
 fuse_abort_conn+0x83/0xb20 fs/fuse/dev.c:2117
 fuse_dev_release+0x2b6/0x300 fs/fuse/dev.c:2197
 __fput+0x243/0x4d0 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:165 [inline]
 exit_to_user_mode_prepare+0x16e/0x1b0 kernel/entry/common.c:192
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:267
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888108793b28 of 4 bytes by task 4640 on cpu 0:
 fuse_get_req+0x1d2/0x520 fs/fuse/dev.c:123
 fuse_simple_request+0x83/0xdd0 fs/fuse/dev.c:504
 fuse_lookup_name+0x153/0x3b0 fs/fuse/dir.c:429
 fuse_lookup+0x6b/0x290 fs/fuse/dir.c:467
 fuse_atomic_open+0xb9/0x840 fs/fuse/dir.c:610
 atomic_open fs/namei.c:2969 [inline]
 lookup_open fs/namei.c:3075 [inline]
 open_last_lookups fs/namei.c:3177 [inline]
 path_openat+0xa4b/0x20a0 fs/namei.c:3365
 do_filp_open+0xbd/0x1d0 fs/namei.c:3395
 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: 0 PID: 4640 Comm: syz-executor.5 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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