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BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

write to 0xffff8880322a9104 of 4 bytes by task 20730 on cpu 0:
 fuse_set_initialized+0x15/0x30 fs/fuse/dev.c:81
 process_init_reply+0xa8c/0xac0 fs/fuse/inode.c:983
 fuse_request_end+0x76a/0x7a0 fs/fuse/dev.c:326
 fuse_dev_do_write+0xb75/0xde0 fs/fuse/dev.c:1910
 fuse_dev_write+0x98/0xe0 fs/fuse/dev.c:1932
 call_write_iter include/linux/fs.h:1877 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x630/0x6b0 fs/read_write.c:586
 ksys_write+0xce/0x180 fs/read_write.c:639
 __do_sys_write fs/read_write.c:651 [inline]
 __se_sys_write fs/read_write.c:648 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:648
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880322a9104 of 4 bytes by task 20724 on cpu 1:
 fuse_block_alloc fs/fuse/dev.c:86 [inline]
 fuse_get_req+0xed/0x510 fs/fuse/dev.c:113
 fuse_simple_request+0x71/0xd30 fs/fuse/dev.c:492
 fuse_do_setattr+0x802/0xcf0 fs/fuse/dir.c:1569
 fuse_setattr+0x2b1/0x5a0 fs/fuse/dir.c:1670
 notify_change+0x7b3/0xa50 fs/attr.c:336
 vfs_utimes+0x2b1/0x3d0 fs/utimes.c:65
 do_utimes_path fs/utimes.c:97 [inline]
 do_utimes fs/utimes.c:143 [inline]
 __do_sys_utime fs/utimes.c:224 [inline]
 __se_sys_utime+0x10b/0x1c0 fs/utimes.c:213
 __x64_sys_utime+0x2d/0x40 fs/utimes.c:213
 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: 20724 Comm: syz-executor.1 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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