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BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

write to 0xffff8880b4f3bf04 of 4 bytes by task 11016 on cpu 1:
 fuse_set_initialized+0x15/0x30 fs/fuse/dev.c:81
 process_init_reply+0xa88/0xab0 fs/fuse/inode.c:983
 fuse_request_end+0x757/0x7a0 fs/fuse/dev.c:326
 fuse_dev_do_write+0xbfd/0xe20 fs/fuse/dev.c:1910
 fuse_dev_write+0x98/0xe0 fs/fuse/dev.c:1932
 call_write_iter include/linux/fs.h:1882 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x665/0x6f0 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 0xffff8880b4f3bf04 of 4 bytes by task 11003 on cpu 0:
 fuse_block_alloc fs/fuse/dev.c:86 [inline]
 fuse_get_req+0xed/0x510 fs/fuse/dev.c:113
 fuse_simple_request+0x71/0xd50 fs/fuse/dev.c:492
 fuse_lookup_name+0x14e/0x3b0 fs/fuse/dir.c:352
 fuse_lookup+0x6d/0x270 fs/fuse/dir.c:390
 __lookup_slow+0x182/0x250 fs/namei.c:1544
 lookup_slow fs/namei.c:1561 [inline]
 walk_component+0x2a5/0x350 fs/namei.c:1860
 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]
 __do_sys_chdir fs/open.c:491 [inline]
 __se_sys_chdir+0x3f/0x150 fs/open.c:485
 __x64_sys_chdir+0x1b/0x20 fs/open.c:485
 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: 11003 Comm: syz-executor.1 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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