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BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

read to 0xffff88810c8b8304 of 4 bytes by task 22300 on cpu 1:
 fuse_block_alloc fs/fuse/dev.c:86 [inline]
 fuse_get_req+0xb6/0x450 fs/fuse/dev.c:113
 fuse_simple_request+0x7f/0x640 fs/fuse/dev.c:492
 fuse_send_open.isra.0+0x193/0x1d0 fs/fuse/file.c:53
 fuse_do_open+0x1e2/0x320 fs/fuse/file.c:149
 fuse_open_common+0xe5/0x1f0 fs/fuse/file.c:233
 fuse_open+0x29/0x40 fs/fuse/file.c:307
 do_dentry_open+0x301/0x970 fs/open.c:797
 vfs_open+0x62/0x80 fs/open.c:914
 do_last fs/namei.c:3408 [inline]
 path_openat+0xf73/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 ksys_open include/linux/syscalls.h:1385 [inline]
 __do_sys_creat fs/open.c:1155 [inline]
 __se_sys_creat fs/open.c:1153 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1153
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88810c8b8304 of 4 bytes by task 22297 on cpu 0:
 fuse_set_initialized+0x22/0x40 fs/fuse/dev.c:81
 process_init_reply+0x96/0xb90 fs/fuse/inode.c:969
 fuse_request_end+0x324/0x530 fs/fuse/dev.c:328
 end_requests+0x100/0x160 fs/fuse/dev.c:2051
 fuse_abort_conn+0x6de/0x740 fs/fuse/dev.c:2146
 fuse_dev_release+0x26b/0x290 fs/fuse/dev.c:2181
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22297 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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