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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff888133ef91ec of 4 bytes by task 21308 on cpu 1:
 fifo_open+0x9c/0x5d0 fs/pipe.c:1104
 do_dentry_open+0x59a/0x910 fs/open.c:882
 vfs_open+0x43/0x50 fs/open.c:1013
 do_open fs/namei.c:3557 [inline]
 path_openat+0x16b8/0x1b60 fs/namei.c:3714
 do_filp_open+0x105/0x220 fs/namei.c:3741
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_open fs/open.c:1334 [inline]
 __se_sys_open fs/open.c:1330 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1330
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888133ef91ec of 4 bytes by task 21306 on cpu 0:
 pipe_unlock fs/pipe.c:96 [inline]
 wait_for_partner+0x98/0x1d0 fs/pipe.c:1078
 fifo_open+0x47f/0x5d0 fs/pipe.c:1148
 do_dentry_open+0x59a/0x910 fs/open.c:882
 vfs_open+0x43/0x50 fs/open.c:1013
 do_open fs/namei.c:3557 [inline]
 path_openat+0x16b8/0x1b60 fs/namei.c:3714
 do_filp_open+0x105/0x220 fs/namei.c:3741
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_open fs/open.c:1334 [inline]
 __se_sys_open fs/open.c:1330 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1330
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21306 Comm: syz-executor.2 Tainted: G        W          6.1.0-syzkaller-11674-g84e57d292203-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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