================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff86a7c570 of 8 bytes by task 29 on cpu 1: data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130 prb_reserve+0x8d7/0xae0 kernel/printk/printk_ringbuffer.c:1724 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2302 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2402 vprintk_default+0x26/0x30 kernel/printk/printk.c:2441 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2451 kauditd_printk_skb kernel/audit.c:583 [inline] kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:618 kauditd_send_queue+0x273/0x2c0 kernel/audit.c:803 kauditd_thread+0x442/0x680 kernel/audit.c:927 kthread+0x488/0x510 kernel/kthread.c:463 ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 read to 0xffffffff86a7c570 of 8 bytes by task 3046 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_push_tail kernel/printk/printk_ringbuffer.c:792 [inline] desc_reserve kernel/printk/printk_ringbuffer.c:938 [inline] prb_reserve+0x207/0xae0 kernel/printk/printk_ringbuffer.c:1674 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2302 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2402 vprintk_default+0x26/0x30 kernel/printk/printk.c:2441 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2451 audit_log_lost+0x1cc/0x200 kernel/audit.c:412 audit_log_start+0x46f/0x730 kernel/audit.c:-1 common_lsm_audit+0x65/0x230 security/lsm_audit.c:442 slow_avc_audit+0x14c/0x190 security/selinux/avc.c:779 avc_audit security/selinux/include/avc.h:131 [inline] avc_has_perm+0x144/0x190 security/selinux/avc.c:1198 sock_has_perm security/selinux/hooks.c:4815 [inline] selinux_socket_recvmsg+0x192/0x1c0 security/selinux/hooks.c:5162 security_socket_recvmsg+0x4c/0x90 security/security.c:4227 sock_recvmsg+0x38/0x160 net/socket.c:1098 ____sys_recvmsg+0xf5/0x280 net/socket.c:2812 ___sys_recvmsg+0x11f/0x3b0 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+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000003760 -> 0x00000000000baa40 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3046 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_lost=52184 audit_rate_limit=0 audit_backlog_limit=64 audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=53963 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=53964 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=55910 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64