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BUG: KCSAN: data-race in fuse_abort_conn / fuse_get_req

write to 0xffff88800f8b5728 of 4 bytes by task 13564 on cpu 1:
 fuse_abort_conn+0x86/0xb10 fs/fuse/dev.c:2113
 fuse_dev_release+0x2b6/0x300 fs/fuse/dev.c:2193
 __fput+0x263/0x4f0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x17c/0x1b0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88800f8b5728 of 4 bytes by task 13553 on cpu 0:
 fuse_get_req+0x232/0x580 fs/fuse/dev.c:123
 fuse_simple_request+0x83/0xde0 fs/fuse/dev.c:504
 fuse_send_write_pages+0x2f3/0x5a0 fs/fuse/file.c:1112
 fuse_perform_write+0x1a4/0x360 fs/fuse/file.c:1241
 fuse_cache_write_iter fs/fuse/file.c:1336 [inline]
 fuse_file_write_iter+0x5c1/0x850 fs/fuse/file.c:1601
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 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+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13553 Comm: syz-executor.1 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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