==================================================================
BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff888139d4206c of 4 bytes by task 12212 on cpu 0:
 fifo_open+0x9c/0x5d0 fs/pipe.c:1104
 do_dentry_open+0x51a/0x8b0 fs/open.c:880
 vfs_open+0x43/0x50 fs/open.c:1016
 do_open fs/namei.c:3557 [inline]
 path_openat+0x169d/0x1b00 fs/namei.c:3691
 do_filp_open+0x105/0x220 fs/namei.c:3718
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_open fs/open.c:1337 [inline]
 __se_sys_open fs/open.c:1333 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1333
 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 0xffff888139d4206c of 4 bytes by task 12223 on cpu 1:
 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+0x51a/0x8b0 fs/open.c:880
 vfs_open+0x43/0x50 fs/open.c:1016
 do_open fs/namei.c:3557 [inline]
 path_openat+0x169d/0x1b00 fs/namei.c:3691
 do_filp_open+0x105/0x220 fs/namei.c:3718
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_open fs/open.c:1337 [inline]
 __se_sys_open fs/open.c:1333 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1333
 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: 1 PID: 12223 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
==================================================================