BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86c88a30 of 8 bytes by task 29240 on cpu 1:
 data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130
 prb_reserve+0x8d6/0xad0 kernel/printk/printk_ringbuffer.c:1727
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 fail_dump lib/fault-inject.c:66 [inline]
 should_fail_ex+0x24b/0x280 lib/fault-inject.c:174
 should_failslab+0x8c/0xb0 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4523 [inline]
 slab_alloc_node mm/slub.c:4876 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kvmalloc_node_noprof+0x155/0x640 mm/slub.c:6833
 kvmalloc_array_node_noprof include/linux/slab.h:1216 [inline]
 __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:481 [inline]
 ptr_ring_init_noprof include/linux/ptr_ring.h:499 [inline]
 page_pool_init net/core/page_pool.c:262 [inline]
 page_pool_create_percpu+0x223/0x690 net/core/page_pool.c:352
 page_pool_create+0x1a/0x30 net/core/page_pool.c:377
 xdp_test_run_setup net/bpf/test_run.c:171 [inline]
 bpf_test_run_xdp_live+0x1a8/0x1360 net/bpf/test_run.c:372
 bpf_prog_test_run_xdp+0x57b/0xa10 net/bpf/test_run.c:1430
 bpf_prog_test_run+0x204/0x340 kernel/bpf/syscall.c:4742
 __sys_bpf+0x52e/0x7e0 kernel/bpf/syscall.c:6292
 __do_sys_bpf kernel/bpf/syscall.c:6387 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6385 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6385
 x64_sys_call+0x10cb/0x3020 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86c88a30 of 8 bytes by task 29234 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+0x216/0xad0 kernel/printk/printk_ringbuffer.c:1677
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 __netdev_printk+0x310/0x370 net/core/dev.c:12949
 netdev_info+0xa6/0xd0 net/core/dev.c:12996
 __dev_set_promiscuity+0x1ee/0x3d0 net/core/dev.c:9618
 __dev_set_rx_mode+0x321/0x390 net/core/dev_addr_lists.c:1383
 dev_uc_del+0x144/0x160 net/core/dev_addr_lists.c:852
 macsec_dev_stop+0x37c/0x3c0 drivers/net/macsec.c:3668
 __dev_close_many+0x250/0x450 net/core/dev.c:1776
 netif_close_many+0x101/0x2d0 net/core/dev.c:1801
 unregister_netdevice_many_notify+0x509/0x1650 net/core/dev.c:12391
 unregister_netdevice_many+0x19/0x20 net/core/dev.c:12484
 rtnl_newlink_create+0x563/0x650 net/core/rtnetlink.c:3892
 __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
 rtnl_newlink+0x1185/0x1400 net/core/rtnetlink.c:4110
 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6997
 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2555
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7024
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1899
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752
 __sys_sendmsg net/socket.c:2784 [inline]
 __do_sys_sendmsg net/socket.c:2789 [inline]
 __se_sys_sendmsg net/socket.c:2787 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787
 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/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000000f31e8 -> 0x000000000019be58

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 29234 Comm: syz.7.7034 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
==================================================================
batadv0: left promiscuous mode