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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff88811dff62ac of 4 bytes by task 7542 on cpu 1:
 fifo_open+0xa0/0x5e0 fs/pipe.c:1125
 do_dentry_open+0x637/0xbd0 fs/open.c:953
 vfs_open+0x4a/0x50 fs/open.c:1087
 do_open fs/namei.c:3641 [inline]
 path_openat+0x1821/0x1d40 fs/namei.c:3798
 do_filp_open+0xf6/0x200 fs/namei.c:3825
 do_sys_openat2+0xab/0x110 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_open fs/open.c:1427 [inline]
 __se_sys_open fs/open.c:1423 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1423
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88811dff62ac of 4 bytes by task 7543 on cpu 0:
 pipe_unlock fs/pipe.c:96 [inline]
 wait_for_partner+0xc6/0x1d0 fs/pipe.c:1099
 fifo_open+0x483/0x5e0 fs/pipe.c:1169
 do_dentry_open+0x637/0xbd0 fs/open.c:953
 vfs_open+0x4a/0x50 fs/open.c:1087
 do_open fs/namei.c:3641 [inline]
 path_openat+0x1821/0x1d40 fs/namei.c:3798
 do_filp_open+0xf6/0x200 fs/namei.c:3825
 do_sys_openat2+0xab/0x110 fs/open.c:1404
 __do_sys_openat2 fs/open.c:1460 [inline]
 __se_sys_openat2+0x17d/0x1c0 fs/open.c:1438
 __x64_sys_openat2+0x55/0x60 fs/open.c:1438
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7543 Comm: syz-executor.4 Not tainted 6.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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