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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff888119d79064 of 4 bytes by task 14027 on cpu 1:
 fifo_open+0x89/0x5b0 fs/pipe.c:1215
 do_dentry_open+0x496/0xa40 fs/open.c:1000
 vfs_open_consume+0x46/0x1f0 fs/open.c:1131
 do_open fs/namei.c:4851 [inline]
 path_openat+0xc16/0x11c0 fs/namei.c:5016
 do_file_open+0x16c/0x290 fs/namei.c:5045
 do_sys_openat2+0xa1/0x140 fs/open.c:1443
 __do_sys_openat2 fs/open.c:1492 [inline]
 __se_sys_openat2+0x193/0x1f0 fs/open.c:1468
 __x64_sys_openat2+0x55/0x70 fs/open.c:1468
 x64_sys_call+0x196c/0x2550 arch/x86/include/generated/asm/syscalls_64.h:438
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x116/0x380 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888119d79064 of 4 bytes by task 14028 on cpu 0:
 pipe_unlock fs/pipe.c:97 [inline]
 wait_for_partner+0xd9/0x210 fs/pipe.c:1189
 fifo_open+0x443/0x5b0 fs/pipe.c:1259
 do_dentry_open+0x496/0xa40 fs/open.c:1000
 vfs_open_consume+0x46/0x1f0 fs/open.c:1131
 do_open fs/namei.c:4851 [inline]
 path_openat+0xc16/0x11c0 fs/namei.c:5016
 do_file_open+0x16c/0x290 fs/namei.c:5045
 do_sys_openat2+0xa1/0x140 fs/open.c:1443
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_openat fs/open.c:1465 [inline]
 __se_sys_openat fs/open.c:1460 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1460
 x64_sys_call+0x1f72/0x2550 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x116/0x380 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14028 Comm: syz.0.2556 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
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