syzbot

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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff8881181fc96c of 4 bytes by task 10575 on cpu 0:
 fifo_open+0xa0/0x5e0 fs/pipe.c:1116
 do_dentry_open+0x644/0xbf0 fs/open.c:955
 vfs_open+0x30/0x40 fs/open.c:1089
 do_open fs/namei.c:3650 [inline]
 path_openat+0x18d6/0x1da0 fs/namei.c:3807
 do_filp_open+0xf7/0x200 fs/namei.c:3834
 do_sys_openat2+0xab/0x120 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_creat fs/open.c:1496 [inline]
 __se_sys_creat fs/open.c:1490 [inline]
 __x64_sys_creat+0x66/0x90 fs/open.c:1490
 x64_sys_call+0x2365/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881181fc96c of 4 bytes by task 10574 on cpu 1:
 pipe_lock fs/pipe.c:91 [inline]
 wait_for_partner+0x106/0x1e0 fs/pipe.c:1093
 fifo_open+0x483/0x5e0 fs/pipe.c:1160
 do_dentry_open+0x644/0xbf0 fs/open.c:955
 vfs_open+0x30/0x40 fs/open.c:1089
 do_open fs/namei.c:3650 [inline]
 path_openat+0x18d6/0x1da0 fs/namei.c:3807
 do_filp_open+0xf7/0x200 fs/namei.c:3834
 do_sys_openat2+0xab/0x120 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_open fs/open.c:1428 [inline]
 __se_sys_open fs/open.c:1424 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1424
 x64_sys_call+0x12d6/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:3
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f