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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff888102381364 of 4 bytes by task 25584 on cpu 1:
 put_pipe_info fs/pipe.c:714 [inline]
 fifo_open+0x17f/0x5d0 fs/pipe.c:1242
 do_dentry_open+0x4be/0xa90 fs/open.c:947
 vfs_open+0x37/0x1e0 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x1b70/0x2050 fs/namei.c:4858
 do_file_open+0x16c/0x290 fs/namei.c:4887
 file_open_name+0xfa/0x120 fs/open.c:1322
 acct_on kernel/acct.c:229 [inline]
 __do_sys_acct kernel/acct.c:302 [inline]
 __se_sys_acct+0x8c/0x500 kernel/acct.c:293
 __x64_sys_acct+0x1f/0x30 kernel/acct.c:293
 x64_sys_call+0x2e7f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:164
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888102381364 of 4 bytes by task 25589 on cpu 0:
 pipe_lock fs/pipe.c:90 [inline]
 wait_for_partner+0x117/0x1e0 fs/pipe.c:1109
 fifo_open+0x4b1/0x5d0 fs/pipe.c:1197
 do_dentry_open+0x4be/0xa90 fs/open.c:947
 vfs_open+0x37/0x1e0 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x1b70/0x2050 fs/namei.c:4858
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_open fs/open.c:1378 [inline]
 __se_sys_open fs/open.c:1374 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1374
 x64_sys_call+0x14b9/0x3020 arch/x86/include/generated/asm/syscalls_64.h:3
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 25589 Comm: syz.7.17468 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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