==================================================================
BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

write to 0xffff888096265b04 of 4 bytes by task 2908 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:578
 ksys_write+0xce/0x180 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:640
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888096265b04 of 4 bytes by task 2904 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
 link_path_walk+0x462/0x730 fs/namei.c:2179
 path_lookupat+0x7b/0x560 fs/namei.c:2332
 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_mount fs/namespace.c:3202 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount+0xf1/0x180 fs/namespace.c:3390
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3390
 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: 2904 Comm: syz-executor.0 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================