syzbot

==================================================================
BUG: KCSAN: data-race in audit_log_start / audit_receive

write to 0xffffffff88edd4d0 of 8 bytes by task 10852 on cpu 1:
 audit_ctl_lock kernel/audit.c:245 [inline]
 audit_receive+0x78/0x2200 kernel/audit.c:1605
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x145/0x180 net/socket.c:742
 sock_sendmsg+0xc1/0x130 net/socket.c:765
 splice_to_socket+0x5f3/0x990 fs/splice.c:886
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0x156/0x2a0 fs/splice.c:1161
 splice_direct_to_actor+0x312/0x680 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0xda/0x150 fs/splice.c:1230
 do_sendfile+0x380/0x650 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64 fs/read_write.c:1417 [inline]
 __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417
 x64_sys_call+0x2db1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88edd4d0 of 8 bytes by task 3047 on cpu 0:
 audit_ctl_owner_current kernel/audit.c:266 [inline]
 audit_log_start+0x106/0x720 kernel/audit.c:1923
 common_lsm_audit+0x66/0x230 security/lsm_audit.c:442
 slow_avc_audit+0x104/0x140 security/selinux/avc.c:779
 avc_audit security/selinux/include/avc.h:131 [inline]
 avc_has_perm+0x13a/0x180 security/selinux/avc.c:1198
 sock_has_perm security/selinux/hooks.c:4815 [inline]
 selinux_socket_recvmsg+0x175/0x1b0 security/selinux/hooks.c:5162
 security_socket_recvmsg+0x50/0x90 security/security.c:4227
 sock_recvmsg+0x38/0x170 net/socket.c:1098
 ____sys_recvmsg+0xf5/0x280 net/socket.c:2812
 ___sys_recvmsg+0x11f/0x370 net/socket.c:2854
 __sys_recvmsg net/socket.c:2887 [inline]
 __do_sys_recvmsg net/socket.c:2893 [inline]
 __se_sys_recvmsg net/socket.c:2890 [inline]
 __x64_sys_recvmsg+0xd1/0x160 net/socket.c:2890
 x64_sys_call+0x2cbf/0x3000 arch/x86/include/generated/asm/syscalls_64.h:48
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff88810387a100

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3047 Comm: dhcpcd Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
==================================================================
audit: audit_backlog=65 > audit_backlog_limit=64
audit: audit_lost=21777 audit_rate_limit=0 audit_backlog_limit=64
audit: backlog limit exceeded
audit: audit_backlog=65 > audit_backlog_limit=64
audit: audit_lost=21778 audit_rate_limit=0 audit_backlog_limit=64
audit: backlog limit exceeded
audit: audit_backlog=65 > audit_backlog_limit=64
audit: audit_lost=22115 audit_rate_limit=0 audit_backlog_limit=64
audit: backlog limit exceeded
audit: audit_backlog=65 > audit_backlog_limit=64
audit: audit_lost=22116 audit_rate_limit=0 audit_backlog_limit=64