RSP: 002b:00007fbf938f7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000be RAX: ffffffffffffffda RBX: 00007fbf950e5fa0 RCX: 00007fbf94e8f749 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007fbf938f7090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fbf950e6038 R14: 00007fbf950e5fa0 R15: 00007ffeedb192c8 ================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff868796f8 of 8 bytes by task 1946 on cpu 0: data_alloc+0x280/0x2e0 kernel/printk/printk_ringbuffer.c:1102 prb_reserve+0x807/0xaf0 kernel/printk/printk_ringbuffer.c:1685 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399 vprintk_deferred kernel/printk/printk.c:4577 [inline] _printk_deferred+0x82/0xb0 kernel/printk/printk.c:4586 ___ratelimit+0x4b1/0x4f0 lib/ratelimit.c:86 __nla_validate_parse+0x15e8/0x1d00 lib/nlattr.c:647 __nla_parse+0x40/0x60 lib/nlattr.c:732 nla_parse_deprecated include/net/netlink.h:736 [inline] nfnetlink_rcv_msg+0x347/0x590 net/netfilter/nfnetlink.c:275 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2552 nfnetlink_rcv+0x167/0x16c0 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x145/0x180 net/socket.c:742 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2630 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2719 x64_sys_call+0x191e/0x3000 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868796f8 of 8 bytes by task 1942 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:479 [inline] desc_push_tail kernel/printk/printk_ringbuffer.c:775 [inline] desc_reserve kernel/printk/printk_ringbuffer.c:921 [inline] prb_reserve+0x220/0xaf0 kernel/printk/printk_ringbuffer.c:1635 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2448 show_trace_log_lvl+0x50e/0x560 arch/x86/kernel/dumpstack.c:302 __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x265/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4931 [inline] slab_alloc_node mm/slub.c:5264 [inline] kmem_cache_alloc_noprof+0x50/0x480 mm/slub.c:5295 audit_buffer_alloc kernel/audit.c:1830 [inline] audit_log_start+0x342/0x720 kernel/audit.c:1955 audit_seccomp+0x48/0x100 kernel/auditsc.c:2976 seccomp_log kernel/seccomp.c:1048 [inline] __seccomp_filter+0x83e/0x1250 kernel/seccomp.c:1344 __secure_computing+0x82/0x150 kernel/seccomp.c:1404 syscall_trace_enter+0xcf/0x1e0 kernel/entry/syscall-common.c:44 syscall_enter_from_user_mode_work include/linux/entry-common.h:95 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:125 [inline] do_syscall_64+0xac/0x200 arch/x86/entry/syscall_64.c:90 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffffffffffff5c90 -> 0x00000000000ab7c8 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 1942 Comm: syz.2.4330 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ==================================================================