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

read-write to 0xffff888124a07964 of 4 bytes by task 14742 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:4845 [inline]
 path_openat+0xc16/0x11c0 fs/namei.c:5010
 do_file_open+0x16c/0x290 fs/namei.c:5039
 file_open_name+0xfa/0x120 fs/open.c:1400
 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+0x1461/0x2550 arch/x86/include/generated/asm/syscalls_64.h:164
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888124a07964 of 4 bytes by task 14749 on cpu 0:
 pipe_lock fs/pipe.c:90 [inline]
 wait_for_partner+0x11b/0x210 fs/pipe.c:1192
 fifo_open+0x491/0x5b0 fs/pipe.c:1280
 do_dentry_open+0x496/0xa40 fs/open.c:1000
 vfs_open_consume+0x46/0x1f0 fs/open.c:1131
 do_open fs/namei.c:4845 [inline]
 path_openat+0xc16/0x11c0 fs/namei.c:5010
 do_file_open+0x16c/0x290 fs/namei.c:5039
 do_sys_openat2+0xa1/0x140 fs/open.c:1442
 do_sys_open fs/open.c:1448 [inline]
 __do_sys_openat fs/open.c:1464 [inline]
 __se_sys_openat fs/open.c:1459 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1459
 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+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14749 Comm: syz.5.3704 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
==================================================================