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BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

write to 0xffff888029c0fb04 of 4 bytes by task 15147 on cpu 0:
 fuse_set_initialized+0x15/0x30 fs/fuse/dev.c:82
 process_init_reply+0xdf/0xb40 fs/fuse/inode.c:1078
 fuse_request_end+0x764/0x7a0 fs/fuse/dev.c:332
 fuse_dev_do_write+0xba1/0xe40 fs/fuse/dev.c:1921
 fuse_dev_write+0x98/0xe0 fs/fuse/dev.c:1943
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6d4/0x7c0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888029c0fb04 of 4 bytes by task 15131 on cpu 1:
 fuse_block_alloc fs/fuse/dev.c:87 [inline]
 fuse_get_req+0xfd/0x520 fs/fuse/dev.c:115
 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
 __lookup_slow+0x181/0x250 fs/namei.c:1544
 lookup_slow fs/namei.c:1561 [inline]
 walk_component+0x2a5/0x350 fs/namei.c:1861
 link_path_walk+0x451/0x710 fs/namei.c:2180
 path_lookupat+0x7b/0x550 fs/namei.c:2333
 filename_lookup+0xf2/0x380 fs/namei.c:2367
 user_path_at_empty+0x3b/0x50 fs/namei.c:2647
 user_path_at include/linux/namei.h:59 [inline]
 do_mount fs/namespace.c:3215 [inline]
 __do_sys_mount fs/namespace.c:3426 [inline]
 __se_sys_mount+0x209/0x2e0 fs/namespace.c:3403
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3403
 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: 15131 Comm: syz-executor.3 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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