syzbot

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BUG: KCSAN: data-race in sk_psock_drop / unix_stream_sendmsg

write to 0xffff88810220dc08 of 8 bytes by task 3611 on cpu 1:
 sk_psock_stop_verdict net/core/skmsg.c:1311 [inline]
 sk_psock_drop+0x12f/0x270 net/core/skmsg.c:896
 sk_psock_put include/linux/skmsg.h:506 [inline]
 sock_map_unref+0x2a5/0x300 net/core/sock_map.c:185
 __sock_map_delete net/core/sock_map.c:426 [inline]
 sock_map_delete_from_link net/core/sock_map.c:439 [inline]
 sock_map_unlink net/core/sock_map.c:1608 [inline]
 sock_map_remove_links+0x228/0x340 net/core/sock_map.c:1623
 sock_map_close+0xa1/0x340 net/core/sock_map.c:1684
 unix_release+0x4e/0x80 net/unix/af_unix.c:1183
 __sock_release net/socket.c:662 [inline]
 sock_close+0x6b/0x150 net/socket.c:1455
 __fput+0x29b/0x650 fs/file_table.c:469
 fput_close_sync+0xad/0x190 fs/file_table.c:574
 __do_sys_close fs/open.c:1509 [inline]
 __se_sys_close fs/open.c:1494 [inline]
 __x64_sys_close+0x55/0xf0 fs/open.c:1494
 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810220dc08 of 8 bytes by task 3605 on cpu 0:
 unix_stream_sendmsg+0x7f8/0xbb0 net/unix/af_unix.c:2480
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0x5af/0x600 net/socket.c:2592
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681
 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffffffff8486dd00 -> 0xffffffff8472c9f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3605 Comm: syz.4.30 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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