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BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

write to 0xffff8880a26a9304 of 4 bytes by task 25308 on cpu 1:
 fuse_set_initialized+0x22/0x40 fs/fuse/dev.c:81
 process_init_reply+0x96/0xb90 fs/fuse/inode.c:966
 fuse_request_end+0x328/0x540 fs/fuse/dev.c:326
 end_requests+0x100/0x160 fs/fuse/dev.c:2049
 fuse_abort_conn+0x6de/0x740 fs/fuse/dev.c:2144
 fuse_dev_release+0x26b/0x290 fs/fuse/dev.c:2179
 __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

read to 0xffff8880a26a9304 of 4 bytes by task 25303 on cpu 0:
 fuse_block_alloc fs/fuse/dev.c:86 [inline]
 fuse_get_req+0x50/0x4c0 fs/fuse/dev.c:111
 fuse_simple_request+0x7f/0x6d0 fs/fuse/dev.c:490
 fuse_lookup_name+0x20a/0x460 fs/fuse/dir.c:345
 fuse_lookup+0x7c/0x200 fs/fuse/dir.c:383
 __lookup_slow+0x129/0x2a0 fs/namei.c:1663
 lookup_slow+0x4f/0x70 fs/namei.c:1680
 walk_component+0x4a2/0xe80 fs/namei.c:1800
 lookup_last fs/namei.c:2263 [inline]
 path_lookupat.isra.0+0x13a/0x5a0 fs/namei.c:2308
 filename_lookup+0x145/0x2b0 fs/namei.c:2338
 kern_path+0x3f/0x60 fs/namei.c:2424
 lookup_bdev.part.0+0x3e/0x130 fs/block_dev.c:2164
 lookup_bdev+0x62/0x70 fs/block_dev.c:2185
 quotactl_block fs/quota/quota.c:797 [inline]
 kernel_quotactl+0xb8/0xfa0 fs/quota/quota.c:858

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25303 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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