syzbot

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BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff88813263ec6c of 4 bytes by task 25476 on cpu 1:
 fifo_open+0xa0/0x5e0 fs/pipe.c:1116
 do_dentry_open+0x63c/0xbe0 fs/open.c:955
 vfs_open+0x4a/0x60 fs/open.c:1089
 do_open fs/namei.c:3642 [inline]
 path_openat+0x18ba/0x1d80 fs/namei.c:3799
 do_filp_open+0xf7/0x200 fs/namei.c:3826
 do_sys_openat2+0xab/0x120 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_open fs/open.c:1429 [inline]
 __se_sys_open fs/open.c:1425 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1425
 x64_sys_call+0x12ae/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:3
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88813263ec6c of 4 bytes by task 25475 on cpu 0:
 pipe_unlock fs/pipe.c:98 [inline]
 wait_for_partner+0xc7/0x1e0 fs/pipe.c:1090
 fifo_open+0x483/0x5e0 fs/pipe.c:1160
 do_dentry_open+0x63c/0xbe0 fs/open.c:955
 vfs_open+0x4a/0x60 fs/open.c:1089
 do_open fs/namei.c:3642 [inline]
 path_openat+0x18ba/0x1d80 fs/namei.c:3799
 do_filp_open+0xf7/0x200 fs/namei.c:3826
 do_sys_openat2+0xab/0x120 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_open fs/open.c:1429 [inline]
 __se_sys_open fs/open.c:1425 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1425
 x64_sys_call+0x12ae/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:3
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25475 Comm: syz-executor.4 Tainted: G        W          6.9.0-rc6-syzkaller-00053-g0106679839f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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