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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff88812062b7ec of 4 bytes by task 4249 on cpu 1:
 fifo_open+0x59f/0x5d0 fs/pipe.c:1142
 do_dentry_open+0x530/0xa40 fs/open.c:965
 vfs_open+0x37/0x1e0 fs/open.c:1097
 do_open fs/namei.c:4045 [inline]
 path_openat+0x1d76/0x2280 fs/namei.c:4204
 do_file_open_root+0x1d0/0x400 fs/namei.c:4256
 file_open_root+0xfd/0x130 fs/open.c:1416
 do_handle_open+0x65f/0x6f0 fs/fhandle.c:427
 __do_sys_open_by_handle_at fs/fhandle.c:455 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:446 [inline]
 __x64_sys_open_by_handle_at+0x44/0x50 fs/fhandle.c:446
 x64_sys_call+0x2b6a/0x3000 arch/x86/include/generated/asm/syscalls_64.h:305
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88812062b7ec of 4 bytes by task 4251 on cpu 0:
 pipe_unlock fs/pipe.c:97 [inline]
 wait_for_partner+0xb5/0x1c0 fs/pipe.c:1106
 fifo_open+0x4b1/0x5d0 fs/pipe.c:1197
 do_dentry_open+0x530/0xa40 fs/open.c:965
 vfs_open+0x37/0x1e0 fs/open.c:1097
 do_open fs/namei.c:4045 [inline]
 path_openat+0x1d76/0x2280 fs/namei.c:4204
 do_filp_open+0x109/0x230 fs/namei.c:4231
 do_sys_openat2+0xa6/0x110 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x65/0x90 fs/open.c:1524
 x64_sys_call+0x2f1c/0x3000 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4251 Comm: syz.3.257 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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