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BUG: KCSAN: data-race in fuse_abort_conn / fuse_get_req

write to 0xffff88801a384728 of 4 bytes by task 29574 on cpu 0:
 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 0xffff88801a384728 of 4 bytes by task 29568 on cpu 1:
 fuse_get_req+0x232/0x580 fs/fuse/dev.c:123
 fuse_simple_background+0x66/0x820 fs/fuse/dev.c:569
 fuse_async_req_send+0x12d/0x190 fs/fuse/file.c:755
 fuse_direct_io+0x10a1/0x1600 fs/fuse/file.c:1067
 fuse_direct_IO+0x531/0x930 fs/fuse/file.c:3198
 fuse_direct_write_iter fs/fuse/file.c:1556 [inline]
 fuse_file_write_iter+0x2e7/0x850 fs/fuse/file.c:1603
 call_write_iter include/linux/fs.h:1977 [inline]
 aio_write+0x2b9/0x3a0 fs/aio.c:1581
 __io_submit_one fs/aio.c:1840 [inline]
 io_submit_one+0x814/0x1280 fs/aio.c:1883
 __do_sys_io_submit fs/aio.c:1942 [inline]
 __se_sys_io_submit+0xf5/0x270 fs/aio.c:1912
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1912
 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: 1 PID: 29568 Comm: syz-executor.0 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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